TY  - JOUR
AU  - Pavun, Leposava
AU  - Janošević-Ležaić, Aleksandra
AU  - Uskoković-Marković, Snežana
PY  - 2024
UR  - https://farfar.pharmacy.bg.ac.rs/handle/123456789/5579
AB  - Abstract
Flavonoids, as plant-derived compounds, were essential active components in traditional
medicine for centuries. Their potential or confirmed effects include antiviral, antimutagenic, antiinflammatory, antibacterial, vasodilatory, and anticancer properties. The promotion of a plantbased diet, along with the benefits of consuming flavonoids, has recently become increasingly
attractive. 3-Hydroxyflavone (3HF) is the structural spine of flavonols, an important subgroup of
flavonoids. Although 3HF itself does not exist in plants per se, it exerts many of its effects because
of its characteristics that allow it to prevent free radical generation. This work is focused on the
characterization of 3HF complexes with zinc(II) and aluminium(III) ions (Zn-3HF and Al-3HF,
respectively). Besides this, a simple, fast, and low-priced spectrophotometric method for 3HF
determination, with very low LOD and LOQ, based on Zn-3HF and Al-3HF formation, was
established. A slight advantage is given to the modification with Al3+ ion on pH 4.91, due to very
low LOD and LOQ values of 1.83×10-7 molL-1
, and 5.50×10-7 molL-1
, respectively, and a high
correlation coefficient, R =0.99986. Furthermore, the antioxidant ability of Zn-3HF, Al-3HF, and
parent 3HF was examined by the ABTS and DPPH tests. They brought the Zn-3HF complex to
the fore as a potential antioxidative agent.
AB  - Flavonoidi, jedinjenja biljnog porekla, vekovima su bili veoma važne aktivne komponente u tradicionalnoj medicini. Veliki broj njihovih potencijalnih ili već potvrđenih efekata uključuje antivirusna, antimutagena, antiinflamatorna, antibakterijska, vazodilatatorna i antikancerogena svojstva. Promovisanje biljne ishrane, uz isticanje koristi konzumiranja flavonoida, u današnje vreme postalo je sve privlačnije. 3-Hidroksiflavon (3HF) je strukturni stub svih flavonola, važne klase flavonoida. Iako sam 3HF ne postoji u biljkama per se, on ispoljava mnoge svoje efekte zahvaljujući osobini da sprečava stvaranja slobodnih radikala. Ovaj rad je fokusiran na karakterizaciju kompleksa 3HF sa jonima cinka(II) i aluminijuma(III) (Zn-3HF i Al-3HF, respektivno). Izvršena je karakterizacija ovih kompleksa i razvijena brza i pristupačna metoda za spektrofotometrijsko određivanje 3HF, na osnovu formiranja kompleksa Zn-3HF i Al-3HF, sa veoma niskim vrednostima LOD i LOQ. Mala prednost je data modifikaciji sa Al3+ na pH 4,91 zbog izuzetno niskih vrednosti LOD i LOQ, 1,83×10-7 mol L-1 , odnosno 5,50×10-7 mol L-1 , kao i visokog koeficijenta korelacije, R=0,99986. Pored toga, antioksidativni kapaciteti sintetizovanih kompleksa Zn-3HF i Al-3HF, kao i samog 3HF, ispitani su DPPH i ABTS testovima i doveli su Zn-3HF kompleks u prvi plan za dalja ispitivanja kao potencijalnog antioksidativnog agensa.
PB  - Beograd : Savez farmaceutskih udruženja Srbije
T2  - Arhiv za farmaciju
T1  - Comparative spectrophotometric determination of 3-hydroxyflavone based on zinc and aluminium complexes and their antioxidative profiles
T1  - Uporedno spektrofotometrijsko određivanje 3-hidroksiflavona bazirano na kompleksima cinka i aluminijuma i njihovi antioksidatni profili
VL  - 74
IS  - 1
SP  - 92
EP  - 104
DO  - 10.5937/arhfarm74-48637
ER  - 

@article{
author = "Pavun, Leposava and Janošević-Ležaić, Aleksandra and Uskoković-Marković, Snežana",
year = "2024",
abstract = "Abstract
Flavonoids, as plant-derived compounds, were essential active components in traditional
medicine for centuries. Their potential or confirmed effects include antiviral, antimutagenic, antiinflammatory, antibacterial, vasodilatory, and anticancer properties. The promotion of a plantbased diet, along with the benefits of consuming flavonoids, has recently become increasingly
attractive. 3-Hydroxyflavone (3HF) is the structural spine of flavonols, an important subgroup of
flavonoids. Although 3HF itself does not exist in plants per se, it exerts many of its effects because
of its characteristics that allow it to prevent free radical generation. This work is focused on the
characterization of 3HF complexes with zinc(II) and aluminium(III) ions (Zn-3HF and Al-3HF,
respectively). Besides this, a simple, fast, and low-priced spectrophotometric method for 3HF
determination, with very low LOD and LOQ, based on Zn-3HF and Al-3HF formation, was
established. A slight advantage is given to the modification with Al3+ ion on pH 4.91, due to very
low LOD and LOQ values of 1.83×10-7 molL-1
, and 5.50×10-7 molL-1
, respectively, and a high
correlation coefficient, R =0.99986. Furthermore, the antioxidant ability of Zn-3HF, Al-3HF, and
parent 3HF was examined by the ABTS and DPPH tests. They brought the Zn-3HF complex to
the fore as a potential antioxidative agent., Flavonoidi, jedinjenja biljnog porekla, vekovima su bili veoma važne aktivne komponente u tradicionalnoj medicini. Veliki broj njihovih potencijalnih ili već potvrđenih efekata uključuje antivirusna, antimutagena, antiinflamatorna, antibakterijska, vazodilatatorna i antikancerogena svojstva. Promovisanje biljne ishrane, uz isticanje koristi konzumiranja flavonoida, u današnje vreme postalo je sve privlačnije. 3-Hidroksiflavon (3HF) je strukturni stub svih flavonola, važne klase flavonoida. Iako sam 3HF ne postoji u biljkama per se, on ispoljava mnoge svoje efekte zahvaljujući osobini da sprečava stvaranja slobodnih radikala. Ovaj rad je fokusiran na karakterizaciju kompleksa 3HF sa jonima cinka(II) i aluminijuma(III) (Zn-3HF i Al-3HF, respektivno). Izvršena je karakterizacija ovih kompleksa i razvijena brza i pristupačna metoda za spektrofotometrijsko određivanje 3HF, na osnovu formiranja kompleksa Zn-3HF i Al-3HF, sa veoma niskim vrednostima LOD i LOQ. Mala prednost je data modifikaciji sa Al3+ na pH 4,91 zbog izuzetno niskih vrednosti LOD i LOQ, 1,83×10-7 mol L-1 , odnosno 5,50×10-7 mol L-1 , kao i visokog koeficijenta korelacije, R=0,99986. Pored toga, antioksidativni kapaciteti sintetizovanih kompleksa Zn-3HF i Al-3HF, kao i samog 3HF, ispitani su DPPH i ABTS testovima i doveli su Zn-3HF kompleks u prvi plan za dalja ispitivanja kao potencijalnog antioksidativnog agensa.",
publisher = "Beograd : Savez farmaceutskih udruženja Srbije",
journal = "Arhiv za farmaciju",
title = "Comparative spectrophotometric determination of 3-hydroxyflavone based on zinc and aluminium complexes and their antioxidative profiles, Uporedno spektrofotometrijsko određivanje 3-hidroksiflavona bazirano na kompleksima cinka i aluminijuma i njihovi antioksidatni profili",
volume = "74",
number = "1",
pages = "92-104",
doi = "10.5937/arhfarm74-48637"
}

Pavun, L., Janošević-Ležaić, A.,& Uskoković-Marković, S.. (2024). Comparative spectrophotometric determination of 3-hydroxyflavone based on zinc and aluminium complexes and their antioxidative profiles. in Arhiv za farmaciju
Beograd : Savez farmaceutskih udruženja Srbije., 74(1), 92-104.
https://doi.org/10.5937/arhfarm74-48637

Pavun L, Janošević-Ležaić A, Uskoković-Marković S. Comparative spectrophotometric determination of 3-hydroxyflavone based on zinc and aluminium complexes and their antioxidative profiles. in Arhiv za farmaciju. 2024;74(1):92-104.
doi:10.5937/arhfarm74-48637 .

Pavun, Leposava, Janošević-Ležaić, Aleksandra, Uskoković-Marković, Snežana, "Comparative spectrophotometric determination of 3-hydroxyflavone based on zinc and aluminium complexes and their antioxidative profiles" in Arhiv za farmaciju, 74, no. 1 (2024):92-104,
https://doi.org/10.5937/arhfarm74-48637 . .

TY  - JOUR
AU  - Pavun, Leposava
AU  - Spasojević, Danijela
AU  - Ivanovska, Aleksandra
AU  - Lađarević, Jelena
AU  - Milenković, Marina
AU  - Uskoković-Marković, Snežana
PY  - 2023
UR  - https://farfar.pharmacy.bg.ac.rs/handle/123456789/5420
AB  - Green, black, rooibos, and hibiscus tea (GT, BT, RT, and HT) aqueous extracts were prepared and
characterized in terms of total flavonoids (TFC) and total phenolic (TPC) contents and antioxidant and
antimicrobial activities. BT has the highest, while HT has the lowest TFC (1213 vs. 415 mg l–1
), while the
extracts’ TPCs (2283 – 7251 mg l–1
) decreased in the following order: BT > GT > RT > HT. Their antioxidant activities of 78.1 – 93.1% and 97.8 – 100% were determined according to DPPH and ABTS methods, respectively. BT and especially GT aqueous extracts possessed mild effects against several microorganisms. All examined extracts have an affinity for dyeing wool, cellulose acetate, polyamide, and cotton,
which is proven by the color strength values of 1.65–19.12. Wool, polyacrylonitrile, polyester, polyamide, cotton, and cellulose acetate functionalized with GT aqueous extract inhibited the growth of S. aureus
and E. coli, while polyacrylonitrile and cotton also inhibited the growth of E. faecalis, and C. albicans,
respectively. Wide inhibition zones for S. aureus were observed for fabrics functionalized with BT aqueous extract. Generally, the investigated fabrics showed very high (81.60 – 100%) ABTS radical scavenging ability independent of the extract used. TPCs have good linear correlations with the antioxidant activities of wool and polyacrylonitrile determined by the DPPH method. Fabrics with different chemical compositions dyed and/or functionalized with GT or BT aqueous extracts can be used to produce high-valueadded medical textiles with therapeutic, prophylactic, and protective functions. They can find potential applications in wound treatment, especially in skin wounds that are susceptible to infection with S. aureus.
Moreover, wool and cotton functionalized with GT or BT aqueous extract can also be considered for use in
disposable medical textiles like bandages and gauze used in the wound-healing process.
Keywords: tea aqueous extract; fabric; functionalization; dyeing; antioxidant and antimicrobial
AB  - Водните екстракти подготвени од црн, зелен, ројбуш и хибискус чај (GT, BT, RT и HT) се
карактеризирани од аспект на количество вкупни флавоноиди (TFC) и вкупни феноли (TPC), и
антиоксидациска и антимикробна активност. BT покажува најголема, а HT најмала TFC (1213 vs.
415 mg l–1), додека TPC во воденте екстракти (2283 – 7251 mg l–1) се намалува според следниов
редослед: BT > GT > RT > HT. Нивната антиоксидациска активност, одредена користејќи ги
методите DPPH и ABTS, се движи соодветно во опсег 78,1 – 93.1 % и 97,8 – 100 %. Водните
екстракти на BT и GT покажаа благ ефект врз одредени микроорганизми. Сите испитувани
екстракти имаат афинитет за боење волна, целулозен ацетат, полиамид и памук, што е потврдено
со одредување на јачина на бојата на ткаенините која изнесува 1,65 – 19.12. Волната,
полиакрилонитрилот, полиестерот, полиамидот, памукот и целулозниот ацетат функционализирани со воден екстракт од GT го инхибираат растот на S. aureus и E. coli, додека
полиакрилонитрилот и памукот соодветно го инхибираат растот на E. faecalis и C. albicans.
Широки инхибициони зони за S. aureus се воочени за ткаенините функционализирани со BT.
Општо, испитуваните ткаенини покажуваат многу висока (81,60 – 100 %) способност за
отстранување на ABTS-радикали. Утврдена е добра линеарна зависност помеѓу TPC во водните
екстракти и антиоксидациската активност на волната и полиакрилонитрилот одредени преку
методот DPPH. Ткаенините со различен хемиски состав обоени и/или функционализирани со
водни екстракти од GT или BT можат да се користат за производство на медицински текстил со
висока додадена вредност, кој има терапевтски, профилактички и заштитни функции.
Медицинските текстилни материјали имаат потенцијална примена за третман на рани, особено за
рани на кожа кои се подложни на инфекција со S. aureus. Покрај тоа, волната и памукот
функционализирани со водни екстракти од GT или BT можат да се користат за производство на
медицински завои и гази за еднократна употреба.
PB  - Macedonian Journal of Chemistry and Chemical Engineering
T2  - Macedonian Journal of Chemistry and Chemical Engineering
T1  - Characterization of tea aqueous extracts and their utilization for dyeing and functionalizing fabrics of different chemical compositions
T1  - Карактеризација на водни екстракти од чаеви и нивна употреба за боење и функционализација на ткаенини со различен хемиски состав
VL  - 42
IS  - 2
SP  - 263
EP  - 273
DO  - 10.20450/mjcce2023.2698
ER  - 

@article{
author = "Pavun, Leposava and Spasojević, Danijela and Ivanovska, Aleksandra and Lađarević, Jelena and Milenković, Marina and Uskoković-Marković, Snežana",
year = "2023",
abstract = "Green, black, rooibos, and hibiscus tea (GT, BT, RT, and HT) aqueous extracts were prepared and
characterized in terms of total flavonoids (TFC) and total phenolic (TPC) contents and antioxidant and
antimicrobial activities. BT has the highest, while HT has the lowest TFC (1213 vs. 415 mg l–1
), while the
extracts’ TPCs (2283 – 7251 mg l–1
) decreased in the following order: BT > GT > RT > HT. Their antioxidant activities of 78.1 – 93.1% and 97.8 – 100% were determined according to DPPH and ABTS methods, respectively. BT and especially GT aqueous extracts possessed mild effects against several microorganisms. All examined extracts have an affinity for dyeing wool, cellulose acetate, polyamide, and cotton,
which is proven by the color strength values of 1.65–19.12. Wool, polyacrylonitrile, polyester, polyamide, cotton, and cellulose acetate functionalized with GT aqueous extract inhibited the growth of S. aureus
and E. coli, while polyacrylonitrile and cotton also inhibited the growth of E. faecalis, and C. albicans,
respectively. Wide inhibition zones for S. aureus were observed for fabrics functionalized with BT aqueous extract. Generally, the investigated fabrics showed very high (81.60 – 100%) ABTS radical scavenging ability independent of the extract used. TPCs have good linear correlations with the antioxidant activities of wool and polyacrylonitrile determined by the DPPH method. Fabrics with different chemical compositions dyed and/or functionalized with GT or BT aqueous extracts can be used to produce high-valueadded medical textiles with therapeutic, prophylactic, and protective functions. They can find potential applications in wound treatment, especially in skin wounds that are susceptible to infection with S. aureus.
Moreover, wool and cotton functionalized with GT or BT aqueous extract can also be considered for use in
disposable medical textiles like bandages and gauze used in the wound-healing process.
Keywords: tea aqueous extract; fabric; functionalization; dyeing; antioxidant and antimicrobial, Водните екстракти подготвени од црн, зелен, ројбуш и хибискус чај (GT, BT, RT и HT) се
карактеризирани од аспект на количество вкупни флавоноиди (TFC) и вкупни феноли (TPC), и
антиоксидациска и антимикробна активност. BT покажува најголема, а HT најмала TFC (1213 vs.
415 mg l–1), додека TPC во воденте екстракти (2283 – 7251 mg l–1) се намалува според следниов
редослед: BT > GT > RT > HT. Нивната антиоксидациска активност, одредена користејќи ги
методите DPPH и ABTS, се движи соодветно во опсег 78,1 – 93.1 % и 97,8 – 100 %. Водните
екстракти на BT и GT покажаа благ ефект врз одредени микроорганизми. Сите испитувани
екстракти имаат афинитет за боење волна, целулозен ацетат, полиамид и памук, што е потврдено
со одредување на јачина на бојата на ткаенините која изнесува 1,65 – 19.12. Волната,
полиакрилонитрилот, полиестерот, полиамидот, памукот и целулозниот ацетат функционализирани со воден екстракт од GT го инхибираат растот на S. aureus и E. coli, додека
полиакрилонитрилот и памукот соодветно го инхибираат растот на E. faecalis и C. albicans.
Широки инхибициони зони за S. aureus се воочени за ткаенините функционализирани со BT.
Општо, испитуваните ткаенини покажуваат многу висока (81,60 – 100 %) способност за
отстранување на ABTS-радикали. Утврдена е добра линеарна зависност помеѓу TPC во водните
екстракти и антиоксидациската активност на волната и полиакрилонитрилот одредени преку
методот DPPH. Ткаенините со различен хемиски состав обоени и/или функционализирани со
водни екстракти од GT или BT можат да се користат за производство на медицински текстил со
висока додадена вредност, кој има терапевтски, профилактички и заштитни функции.
Медицинските текстилни материјали имаат потенцијална примена за третман на рани, особено за
рани на кожа кои се подложни на инфекција со S. aureus. Покрај тоа, волната и памукот
функционализирани со водни екстракти од GT или BT можат да се користат за производство на
медицински завои и гази за еднократна употреба.",
publisher = "Macedonian Journal of Chemistry and Chemical Engineering",
journal = "Macedonian Journal of Chemistry and Chemical Engineering",
title = "Characterization of tea aqueous extracts and their utilization for dyeing and functionalizing fabrics of different chemical compositions, Карактеризација на водни екстракти од чаеви и нивна употреба за боење и функционализација на ткаенини со различен хемиски состав",
volume = "42",
number = "2",
pages = "263-273",
doi = "10.20450/mjcce2023.2698"
}

Pavun, L., Spasojević, D., Ivanovska, A., Lađarević, J., Milenković, M.,& Uskoković-Marković, S.. (2023). Characterization of tea aqueous extracts and their utilization for dyeing and functionalizing fabrics of different chemical compositions. in Macedonian Journal of Chemistry and Chemical Engineering
Macedonian Journal of Chemistry and Chemical Engineering., 42(2), 263-273.
https://doi.org/10.20450/mjcce2023.2698

Pavun L, Spasojević D, Ivanovska A, Lađarević J, Milenković M, Uskoković-Marković S. Characterization of tea aqueous extracts and their utilization for dyeing and functionalizing fabrics of different chemical compositions. in Macedonian Journal of Chemistry and Chemical Engineering. 2023;42(2):263-273.
doi:10.20450/mjcce2023.2698 .

Pavun, Leposava, Spasojević, Danijela, Ivanovska, Aleksandra, Lađarević, Jelena, Milenković, Marina, Uskoković-Marković, Snežana, "Characterization of tea aqueous extracts and their utilization for dyeing and functionalizing fabrics of different chemical compositions" in Macedonian Journal of Chemistry and Chemical Engineering, 42, no. 2 (2023):263-273,
https://doi.org/10.20450/mjcce2023.2698 . .

TY  - CONF
AU  - Marić, M.
AU  - Ivković, A.
AU  - Ivković, Branka
AU  - Janošević-Ležaić, Aleksandra
AU  - Uskoković-Marković, Snežana
AU  - Savić, J.
AU  - Milojević-Rakić, M.
AU  - Bajuk-Bogdanović, D.
PY  - 2023
UR  - https://farfar.pharmacy.bg.ac.rs/handle/123456789/5448
AB  - ABSTRACT – Organic dyes from industry wastewater pollute water tables. Here proposed environmental 
solution relies on pristine red soil for oxidative degradation of methylene blue dye. Soil analysis comprised 
spectroscopic (FTIR and Raman) and microscopic (SEM/EDS) techniques, while spectrophotometry was 
applied for dye quantification. The dominant soil mineral is kaolinite, while Fe homogeneous distribution 
is witnessed in the γ-FeO(OH) form. Soil/Fenton reagent achieved substantial 93% dye removal. An optimal 
oxidant concentration in the Fenton system is 10 mM. We confirm the excellent performance of pristine 
red soil samples as naturally occurring adsorbents and catalysts in Fenton oxidation of environmental 
pollutants.
PB  - University of Belgrade
PB  - Technical Faculty in Bor
C3  - XV International Mineral Processing and Recycling Conference, 17-19 May 2023, Belgrade, Serbia
T1  - Removal of methylene blue from aqueous solutions using an iron-rich soil
UR  - https://hdl.handle.net/21.15107/rcub_farfar_5448
ER  - 

@conference{
author = "Marić, M. and Ivković, A. and Ivković, Branka and Janošević-Ležaić, Aleksandra and Uskoković-Marković, Snežana and Savić, J. and Milojević-Rakić, M. and Bajuk-Bogdanović, D.",
year = "2023",
abstract = "ABSTRACT – Organic dyes from industry wastewater pollute water tables. Here proposed environmental 
solution relies on pristine red soil for oxidative degradation of methylene blue dye. Soil analysis comprised 
spectroscopic (FTIR and Raman) and microscopic (SEM/EDS) techniques, while spectrophotometry was 
applied for dye quantification. The dominant soil mineral is kaolinite, while Fe homogeneous distribution 
is witnessed in the γ-FeO(OH) form. Soil/Fenton reagent achieved substantial 93% dye removal. An optimal 
oxidant concentration in the Fenton system is 10 mM. We confirm the excellent performance of pristine 
red soil samples as naturally occurring adsorbents and catalysts in Fenton oxidation of environmental 
pollutants.",
publisher = "University of Belgrade, Technical Faculty in Bor",
journal = "XV International Mineral Processing and Recycling Conference, 17-19 May 2023, Belgrade, Serbia",
title = "Removal of methylene blue from aqueous solutions using an iron-rich soil",
url = "https://hdl.handle.net/21.15107/rcub_farfar_5448"
}

Marić, M., Ivković, A., Ivković, B., Janošević-Ležaić, A., Uskoković-Marković, S., Savić, J., Milojević-Rakić, M.,& Bajuk-Bogdanović, D.. (2023). Removal of methylene blue from aqueous solutions using an iron-rich soil. in XV International Mineral Processing and Recycling Conference, 17-19 May 2023, Belgrade, Serbia
University of Belgrade..
https://hdl.handle.net/21.15107/rcub_farfar_5448

Marić M, Ivković A, Ivković B, Janošević-Ležaić A, Uskoković-Marković S, Savić J, Milojević-Rakić M, Bajuk-Bogdanović D. Removal of methylene blue from aqueous solutions using an iron-rich soil. in XV International Mineral Processing and Recycling Conference, 17-19 May 2023, Belgrade, Serbia. 2023;.
https://hdl.handle.net/21.15107/rcub_farfar_5448 .

Marić, M., Ivković, A., Ivković, Branka, Janošević-Ležaić, Aleksandra, Uskoković-Marković, Snežana, Savić, J., Milojević-Rakić, M., Bajuk-Bogdanović, D., "Removal of methylene blue from aqueous solutions using an iron-rich soil" in XV International Mineral Processing and Recycling Conference, 17-19 May 2023, Belgrade, Serbia (2023),
https://hdl.handle.net/21.15107/rcub_farfar_5448 .

TY  - CONF
AU  - Pavun, Leposava
AU  - Janošević-Ležaić, Aleksandra
AU  - Uskoković-Marković, Snežana
PY  - 2023
UR  - https://farfar.pharmacy.bg.ac.rs/handle/123456789/5216
AB  - Flavonoids, widely distributed second metabolites of plants, have a large 
number of functions. Nowadays, with more nature-oriented lifestyle, the role in plants 
and potential benefits for humans and animals became more and more important.1 
3-Hydroxyflavone (3HF) represents the backbone of all flavonols, a 
widespread class of flavonoids. Interestingly, this compound is not found naturally in 
plants. Regardless, 3HF is commonly applied as a model molecule because it 
possesses an excited-state intramolecular proton transfer effect and may serve as a 
fluorescent probe in studies of either membranes or intermembrane proteins. It has 
also been shown that 3HF inhibits metastasis of human osteosarcoma cells and 
reduces tumor growth in vivo. 
With aim to find wider application of 3HF, its complexes with metal ions 
attract the attention of the researchers. Beside the characterization of zinc complex 
with 3HF, we reported the validation of the developed simple and low-cost 
spectrophotometric determination of 3-hydroxyflavone based on its zinc complex. 
Furthermore, the antioxidant capacities of the synthesized complex and 3HF itself 
were tested by the DPPH method, followed by the evaluation of more positive issues 
of zinc 3HF complex. The results of the performed study highlighted the suitability 
of zinc complex 3HF both for spectrophotometric determination, as well as to explore 
future applications of its potent bioactivity.
PB  - Society of Chemists and Technologists of Macedonia
C3  - 26th Congress of Chemists and Technologists of Macedonia, 20th to 23rd of September 2023, Ohrid , RN Macedonia
T1  - Zinc Complex of 3-Hydroxyflavone: Spectrophotometric  Determination and their Antioxidative Profiles
UR  - https://hdl.handle.net/21.15107/rcub_farfar_5216
ER  - 

@conference{
author = "Pavun, Leposava and Janošević-Ležaić, Aleksandra and Uskoković-Marković, Snežana",
year = "2023",
abstract = "Flavonoids, widely distributed second metabolites of plants, have a large 
number of functions. Nowadays, with more nature-oriented lifestyle, the role in plants 
and potential benefits for humans and animals became more and more important.1 
3-Hydroxyflavone (3HF) represents the backbone of all flavonols, a 
widespread class of flavonoids. Interestingly, this compound is not found naturally in 
plants. Regardless, 3HF is commonly applied as a model molecule because it 
possesses an excited-state intramolecular proton transfer effect and may serve as a 
fluorescent probe in studies of either membranes or intermembrane proteins. It has 
also been shown that 3HF inhibits metastasis of human osteosarcoma cells and 
reduces tumor growth in vivo. 
With aim to find wider application of 3HF, its complexes with metal ions 
attract the attention of the researchers. Beside the characterization of zinc complex 
with 3HF, we reported the validation of the developed simple and low-cost 
spectrophotometric determination of 3-hydroxyflavone based on its zinc complex. 
Furthermore, the antioxidant capacities of the synthesized complex and 3HF itself 
were tested by the DPPH method, followed by the evaluation of more positive issues 
of zinc 3HF complex. The results of the performed study highlighted the suitability 
of zinc complex 3HF both for spectrophotometric determination, as well as to explore 
future applications of its potent bioactivity.",
publisher = "Society of Chemists and Technologists of Macedonia",
journal = "26th Congress of Chemists and Technologists of Macedonia, 20th to 23rd of September 2023, Ohrid , RN Macedonia",
title = "Zinc Complex of 3-Hydroxyflavone: Spectrophotometric  Determination and their Antioxidative Profiles",
url = "https://hdl.handle.net/21.15107/rcub_farfar_5216"
}

Pavun, L., Janošević-Ležaić, A.,& Uskoković-Marković, S.. (2023). Zinc Complex of 3-Hydroxyflavone: Spectrophotometric  Determination and their Antioxidative Profiles. in 26th Congress of Chemists and Technologists of Macedonia, 20th to 23rd of September 2023, Ohrid , RN Macedonia
Society of Chemists and Technologists of Macedonia..
https://hdl.handle.net/21.15107/rcub_farfar_5216

Pavun L, Janošević-Ležaić A, Uskoković-Marković S. Zinc Complex of 3-Hydroxyflavone: Spectrophotometric  Determination and their Antioxidative Profiles. in 26th Congress of Chemists and Technologists of Macedonia, 20th to 23rd of September 2023, Ohrid , RN Macedonia. 2023;.
https://hdl.handle.net/21.15107/rcub_farfar_5216 .

Pavun, Leposava, Janošević-Ležaić, Aleksandra, Uskoković-Marković, Snežana, "Zinc Complex of 3-Hydroxyflavone: Spectrophotometric  Determination and their Antioxidative Profiles" in 26th Congress of Chemists and Technologists of Macedonia, 20th to 23rd of September 2023, Ohrid , RN Macedonia (2023),
https://hdl.handle.net/21.15107/rcub_farfar_5216 .

TY  - JOUR
AU  - Rupar, Jelena
AU  - Hrnjić, Armin
AU  - Uskoković-Marković, Snežana
AU  - Bajuk-Bogdanović, Danica
AU  - Milojević-Rakić, Maja
AU  - Gavrilov, Nemanja
AU  - Janošević-Ležaić, Aleksandra
PY  - 2023
UR  - https://farfar.pharmacy.bg.ac.rs/handle/123456789/4989
AB  - Electrochemical crosslinking of alginate strands by in situ iron oxidation was explored using a potentiostatic regime. Carbon-based materials co-doped with iron, nitrogen, and/or sulfur were prepared via electrolyte composition variation with a nitrogen-rich compound (rivanol) or through post-treatments with sodium sulfide. Nanometer-sized iron particles were confirmed by transmission and field emission scanning electron microscopy in all samples as a consequence of the homogeneous dispersion of iron in the alginate scaffold and its concomitant growth-limiting effect of alginate chains. Raman spectra confirmed a rise in structural disorder with rivanol/Na2S treatment, which points to more defect sites and edges known to be active sites for oxygen reduction. Fourier transform infrared (FTIR) spectra confirmed the presence of different iron, nitrogen, and sulfur species, with a marked difference between Na2S treated/untreated samples. The most positive onset potential (−0.26 V vs. saturated calomel electrode, SCE) was evidenced for the sample co-doped with N, S, and Fe, surpassing the activity of those with single and/or double doping. The mechanism of oxygen reduction in 0.1 M KOH was dominated by the 2e− reduction pathway at low overpotentials and shifted towards complete 4e− reduction at the most negative explored values. The presented results put forward electrochemically formed alginate gels functionalized by homogeneously dispersed multivalent cations as an excellent starting point in nanomaterial design and engineering.
PB  - MDPI
T2  - Polymers
T1  - Electrochemical Crosslinking of Alginate—Towards Doped Carbons for Oxygen Reduction
VL  - 15
IS  - 15
DO  - 10.3390/polym15153169
ER  - 

@article{
author = "Rupar, Jelena and Hrnjić, Armin and Uskoković-Marković, Snežana and Bajuk-Bogdanović, Danica and Milojević-Rakić, Maja and Gavrilov, Nemanja and Janošević-Ležaić, Aleksandra",
year = "2023",
abstract = "Electrochemical crosslinking of alginate strands by in situ iron oxidation was explored using a potentiostatic regime. Carbon-based materials co-doped with iron, nitrogen, and/or sulfur were prepared via electrolyte composition variation with a nitrogen-rich compound (rivanol) or through post-treatments with sodium sulfide. Nanometer-sized iron particles were confirmed by transmission and field emission scanning electron microscopy in all samples as a consequence of the homogeneous dispersion of iron in the alginate scaffold and its concomitant growth-limiting effect of alginate chains. Raman spectra confirmed a rise in structural disorder with rivanol/Na2S treatment, which points to more defect sites and edges known to be active sites for oxygen reduction. Fourier transform infrared (FTIR) spectra confirmed the presence of different iron, nitrogen, and sulfur species, with a marked difference between Na2S treated/untreated samples. The most positive onset potential (−0.26 V vs. saturated calomel electrode, SCE) was evidenced for the sample co-doped with N, S, and Fe, surpassing the activity of those with single and/or double doping. The mechanism of oxygen reduction in 0.1 M KOH was dominated by the 2e− reduction pathway at low overpotentials and shifted towards complete 4e− reduction at the most negative explored values. The presented results put forward electrochemically formed alginate gels functionalized by homogeneously dispersed multivalent cations as an excellent starting point in nanomaterial design and engineering.",
publisher = "MDPI",
journal = "Polymers",
title = "Electrochemical Crosslinking of Alginate—Towards Doped Carbons for Oxygen Reduction",
volume = "15",
number = "15",
doi = "10.3390/polym15153169"
}

Rupar, J., Hrnjić, A., Uskoković-Marković, S., Bajuk-Bogdanović, D., Milojević-Rakić, M., Gavrilov, N.,& Janošević-Ležaić, A.. (2023). Electrochemical Crosslinking of Alginate—Towards Doped Carbons for Oxygen Reduction. in Polymers
MDPI., 15(15).
https://doi.org/10.3390/polym15153169

Rupar J, Hrnjić A, Uskoković-Marković S, Bajuk-Bogdanović D, Milojević-Rakić M, Gavrilov N, Janošević-Ležaić A. Electrochemical Crosslinking of Alginate—Towards Doped Carbons for Oxygen Reduction. in Polymers. 2023;15(15).
doi:10.3390/polym15153169 .

Rupar, Jelena, Hrnjić, Armin, Uskoković-Marković, Snežana, Bajuk-Bogdanović, Danica, Milojević-Rakić, Maja, Gavrilov, Nemanja, Janošević-Ležaić, Aleksandra, "Electrochemical Crosslinking of Alginate—Towards Doped Carbons for Oxygen Reduction" in Polymers, 15, no. 15 (2023),
https://doi.org/10.3390/polym15153169 . .

TY  - JOUR
AU  - Popadić, Daliborka
AU  - Gavrilov, Nemanja
AU  - Krstić, Jugoslav
AU  - Nedić Vasiljević, Bojana
AU  - Janošević-Ležaić, Aleksandra
AU  - Uskoković-Marković, Snežana
AU  - Milojević-Rakić, Maja
AU  - Bajuk-Bogdanović, Danica
PY  - 2023
UR  - https://farfar.pharmacy.bg.ac.rs/handle/123456789/4882
AB  - Herein we unequivocally identify the mechanism of zeolite-catalysed thermal degradation of pesticide, employing Fourier-transform infrared spectroscopy (FTIR), Raman and mass spectrometry following temperature decomposition (TPDe/MS). We demonstrate that Y zeolite can effectively adsorb a significant amount of acetamiprid both in a single trial (168 mg/g) and in 10 cycles (1249 mg/g) with intermittent thermal regeneration at 300 °C. Sectional vibrational analysis of acetamiprid two-stage thermal degradation is performed for pristine and supported pesticide. The acetamiprid Raman spectral changes appear at 200 °C, while partial carbonization occurs at 250 °C. The gradual disappearance of the FTIR bands of acetamiprid is seen up to 270 °C when two Raman signature bands for carbonised material emerged. The TPDe/MS profiles reveal the evolution of mass fragments - in the first step, cleavage of the C[sbnd]C bond occurs between the aromatic core of the molecule and its tail-end, followed by cleavage of the C[sbnd]N bond. The mechanism of adsorbed acetamiprid degradation follows the same step, at significantly lower temperatures, as the process is catalysed by the interaction of acetamiprid nitrogens and zeolite support. Reduced temperature degradation allows for a quick recovery process that leaves 65% efficacy after 10 cycles. After numerous cycles of recovery, a subsequent one-time heat treatment at 700 °C completely restores initial efficacy. The efficient adsorption, novel details on degradation mechanism and ease of regeneration procedure place the Y zeolite at the forefront of future all-encompassing environmental solutions.
PB  - Elsevier B.V.
T2  - Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy
T1  - Spectral evidence of acetamiprid's thermal degradation products and mechanism
VL  - 301
IS  - 15
DO  - 10.1016/j.saa.2023.122987
ER  - 

@article{
author = "Popadić, Daliborka and Gavrilov, Nemanja and Krstić, Jugoslav and Nedić Vasiljević, Bojana and Janošević-Ležaić, Aleksandra and Uskoković-Marković, Snežana and Milojević-Rakić, Maja and Bajuk-Bogdanović, Danica",
year = "2023",
abstract = "Herein we unequivocally identify the mechanism of zeolite-catalysed thermal degradation of pesticide, employing Fourier-transform infrared spectroscopy (FTIR), Raman and mass spectrometry following temperature decomposition (TPDe/MS). We demonstrate that Y zeolite can effectively adsorb a significant amount of acetamiprid both in a single trial (168 mg/g) and in 10 cycles (1249 mg/g) with intermittent thermal regeneration at 300 °C. Sectional vibrational analysis of acetamiprid two-stage thermal degradation is performed for pristine and supported pesticide. The acetamiprid Raman spectral changes appear at 200 °C, while partial carbonization occurs at 250 °C. The gradual disappearance of the FTIR bands of acetamiprid is seen up to 270 °C when two Raman signature bands for carbonised material emerged. The TPDe/MS profiles reveal the evolution of mass fragments - in the first step, cleavage of the C[sbnd]C bond occurs between the aromatic core of the molecule and its tail-end, followed by cleavage of the C[sbnd]N bond. The mechanism of adsorbed acetamiprid degradation follows the same step, at significantly lower temperatures, as the process is catalysed by the interaction of acetamiprid nitrogens and zeolite support. Reduced temperature degradation allows for a quick recovery process that leaves 65% efficacy after 10 cycles. After numerous cycles of recovery, a subsequent one-time heat treatment at 700 °C completely restores initial efficacy. The efficient adsorption, novel details on degradation mechanism and ease of regeneration procedure place the Y zeolite at the forefront of future all-encompassing environmental solutions.",
publisher = "Elsevier B.V.",
journal = "Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy",
title = "Spectral evidence of acetamiprid's thermal degradation products and mechanism",
volume = "301",
number = "15",
doi = "10.1016/j.saa.2023.122987"
}

Popadić, D., Gavrilov, N., Krstić, J., Nedić Vasiljević, B., Janošević-Ležaić, A., Uskoković-Marković, S., Milojević-Rakić, M.,& Bajuk-Bogdanović, D.. (2023). Spectral evidence of acetamiprid's thermal degradation products and mechanism. in Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy
Elsevier B.V.., 301(15).
https://doi.org/10.1016/j.saa.2023.122987

Popadić D, Gavrilov N, Krstić J, Nedić Vasiljević B, Janošević-Ležaić A, Uskoković-Marković S, Milojević-Rakić M, Bajuk-Bogdanović D. Spectral evidence of acetamiprid's thermal degradation products and mechanism. in Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy. 2023;301(15).
doi:10.1016/j.saa.2023.122987 .

Popadić, Daliborka, Gavrilov, Nemanja, Krstić, Jugoslav, Nedić Vasiljević, Bojana, Janošević-Ležaić, Aleksandra, Uskoković-Marković, Snežana, Milojević-Rakić, Maja, Bajuk-Bogdanović, Danica, "Spectral evidence of acetamiprid's thermal degradation products and mechanism" in Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy, 301, no. 15 (2023),
https://doi.org/10.1016/j.saa.2023.122987 . .

TY  - JOUR
AU  - Gledović, Ana
AU  - Bajuk-Bogdanović, Danica
AU  - Uskoković-Marković, Snežana
AU  - Pavun, Leposava
AU  - Savić, Snežana
AU  - Janošević-Ležaić, Aleksandra
PY  - 2022
UR  - https://farfar.pharmacy.bg.ac.rs/handle/123456789/4170
AB  - In this study several essential oils (EOs): basil - BA, lemon balm - LB and oregano - OR were incorporated into nanoemulsions (NEs) as prospective carriers for natural and sensitive bioactives. NEs were prepared via the phase inversion composition (PIC) method, which is an energy-efficient cold process. Physicochemical stability of NEs was confirmed by particle size distribution analysis, electrical conductivity and pH value measurements, as well as by optical microscopy observations. The type of EO and the surfactant and oil mix concentration were found to be crucial factors governing the NE properties and stability. Raman spectra of the EOs confirmed main active ingredients and provided detection of interactions with the nanocarrier, which is a novel application of this technique. The antioxidant activity towards DPPH radical in methanol was concentration-dependent with a similar trend for individual oils and oil-loaded NEs (OR> LB> BA). However, the ABTS test in an aqueous medium revealed notable change in the order of activity after EO nanonisation at higher EO concentrations. Overall, it was found that OR-NE was the most effective and stable system, since OR acted as a co-stabiliser in the NE formulation, and its remarkably high antioxidant activity was successfully preserved during 6 months of storage.
AB  - U ovoj studiji nekoliko različitih etarskih ulja (EU): bosiljak – BO, matičnjak – MA i origano – OR inkor-
porirano je u nanoemulzije (NE) kao potencijalne nosače za prirodne i osetljive bioaktivne sastojke. NE
su pripremljene pomoću metode inverzije faza (engl. phase inversion composition – PIC method) koja
predstavlja niskoenergetski i ekonomičan postupak izrade. Fizičkohemijska stabilnost nanoemulzija
potvrđena je analizom raspodele veličina kapi, merenjem električne provodljivosti i pH vrednosti, kao i
optičkom mikroskopijom. Nađeno je da su vrsta EU i koncentracija smeše surfaktanata i uljane faze dva
ključna faktora koja su uticala na karakteristike i stabilnost dobijenih emulzija. Tehnikom Ramanske
spektroskopije potvrđeni su glavni aktivni sastojci etarskih ulja i detektovane su moguće interakcije sa
nanonosačem, što predstavlja noviju primenu pomenute tehnike. Pokazano je da antioksidantna
aktivnost prema DPPH radikalu u metanolu zavisi od koncentracije, sa sličnim trendom za čista etarska
ulja i za nanoemulzije sa uljima (OR> MA> BO). Međutim, ABTS test u vodenoj sredini pokazao je izrazite
promene u redosledu aktivnosti sa povećanjem koncentracije EU i nakon nanonizacije EU. Generalno,
dokazano je da je OR-NE najefikasniji i najstabiliniji sistem, s obzirom da je ulje origana ispoljilo ulogu
kostabilizatora u formulaciji, uz istovremeno očuvanje njegove veoma visoke antioksidantne aktivnosti
u obliku nanoemulzije, tokom 6 meseci čuvanja.
PB  - Association of the Chemical Engineers of Serbia
T2  - Hemijska industrija
T1  - Low energy nanoemulsions as carriers for essential oils in topical formulations for antioxidant skin protection
T1  - Niskoenergetske nanoemulzije kao nosači za etarska ulja u topikalnim formulacijama za antioksidantnu zaštitu kože
VL  - 76
IS  - 1
SP  - 29
EP  - 42
DO  - 10.2298/HEMIND210509004G
ER  - 

@article{
author = "Gledović, Ana and Bajuk-Bogdanović, Danica and Uskoković-Marković, Snežana and Pavun, Leposava and Savić, Snežana and Janošević-Ležaić, Aleksandra",
year = "2022",
abstract = "In this study several essential oils (EOs): basil - BA, lemon balm - LB and oregano - OR were incorporated into nanoemulsions (NEs) as prospective carriers for natural and sensitive bioactives. NEs were prepared via the phase inversion composition (PIC) method, which is an energy-efficient cold process. Physicochemical stability of NEs was confirmed by particle size distribution analysis, electrical conductivity and pH value measurements, as well as by optical microscopy observations. The type of EO and the surfactant and oil mix concentration were found to be crucial factors governing the NE properties and stability. Raman spectra of the EOs confirmed main active ingredients and provided detection of interactions with the nanocarrier, which is a novel application of this technique. The antioxidant activity towards DPPH radical in methanol was concentration-dependent with a similar trend for individual oils and oil-loaded NEs (OR> LB> BA). However, the ABTS test in an aqueous medium revealed notable change in the order of activity after EO nanonisation at higher EO concentrations. Overall, it was found that OR-NE was the most effective and stable system, since OR acted as a co-stabiliser in the NE formulation, and its remarkably high antioxidant activity was successfully preserved during 6 months of storage., U ovoj studiji nekoliko različitih etarskih ulja (EU): bosiljak – BO, matičnjak – MA i origano – OR inkor-
porirano je u nanoemulzije (NE) kao potencijalne nosače za prirodne i osetljive bioaktivne sastojke. NE
su pripremljene pomoću metode inverzije faza (engl. phase inversion composition – PIC method) koja
predstavlja niskoenergetski i ekonomičan postupak izrade. Fizičkohemijska stabilnost nanoemulzija
potvrđena je analizom raspodele veličina kapi, merenjem električne provodljivosti i pH vrednosti, kao i
optičkom mikroskopijom. Nađeno je da su vrsta EU i koncentracija smeše surfaktanata i uljane faze dva
ključna faktora koja su uticala na karakteristike i stabilnost dobijenih emulzija. Tehnikom Ramanske
spektroskopije potvrđeni su glavni aktivni sastojci etarskih ulja i detektovane su moguće interakcije sa
nanonosačem, što predstavlja noviju primenu pomenute tehnike. Pokazano je da antioksidantna
aktivnost prema DPPH radikalu u metanolu zavisi od koncentracije, sa sličnim trendom za čista etarska
ulja i za nanoemulzije sa uljima (OR> MA> BO). Međutim, ABTS test u vodenoj sredini pokazao je izrazite
promene u redosledu aktivnosti sa povećanjem koncentracije EU i nakon nanonizacije EU. Generalno,
dokazano je da je OR-NE najefikasniji i najstabiliniji sistem, s obzirom da je ulje origana ispoljilo ulogu
kostabilizatora u formulaciji, uz istovremeno očuvanje njegove veoma visoke antioksidantne aktivnosti
u obliku nanoemulzije, tokom 6 meseci čuvanja.",
publisher = "Association of the Chemical Engineers of Serbia",
journal = "Hemijska industrija",
title = "Low energy nanoemulsions as carriers for essential oils in topical formulations for antioxidant skin protection, Niskoenergetske nanoemulzije kao nosači za etarska ulja u topikalnim formulacijama za antioksidantnu zaštitu kože",
volume = "76",
number = "1",
pages = "29-42",
doi = "10.2298/HEMIND210509004G"
}

Gledović, A., Bajuk-Bogdanović, D., Uskoković-Marković, S., Pavun, L., Savić, S.,& Janošević-Ležaić, A.. (2022). Low energy nanoemulsions as carriers for essential oils in topical formulations for antioxidant skin protection. in Hemijska industrija
Association of the Chemical Engineers of Serbia., 76(1), 29-42.
https://doi.org/10.2298/HEMIND210509004G

Gledović A, Bajuk-Bogdanović D, Uskoković-Marković S, Pavun L, Savić S, Janošević-Ležaić A. Low energy nanoemulsions as carriers for essential oils in topical formulations for antioxidant skin protection. in Hemijska industrija. 2022;76(1):29-42.
doi:10.2298/HEMIND210509004G .

Gledović, Ana, Bajuk-Bogdanović, Danica, Uskoković-Marković, Snežana, Pavun, Leposava, Savić, Snežana, Janošević-Ležaić, Aleksandra, "Low energy nanoemulsions as carriers for essential oils in topical formulations for antioxidant skin protection" in Hemijska industrija, 76, no. 1 (2022):29-42,
https://doi.org/10.2298/HEMIND210509004G . .

TY  - JOUR
AU  - Janošević-Ležaić, Aleksandra
AU  - Pašti, Igor
AU  - Gledović, Ana
AU  - Antić-Stanković, Jelena
AU  - Božić, Dragana
AU  - Uskoković-Marković, Snežana
AU  - Ćirić-Marjanović, Gordana
PY  - 2022
UR  - https://farfar.pharmacy.bg.ac.rs/handle/123456789/4067
AB  - Novel electroactive PANI-GA micro/nanostructured functional copolymers/co-oligomers were synthesized by the oxidative copolymerization of aniline and gallic acid (GA) in an aqueous solution, using ammonium peroxydisulfate (APS) as an oxidant and different initial mole ratios of GA to aniline ([GA]/[aniline]=0.1, 0.25, 0.5 and 1.0). It was found that the yield, molecular structure, morphology, electrical conductivity, electrochemical behavior, antioxidant and antimicrobial properties of PANI-GA strongly depend on [GA]/[aniline] ratio. The highest conductivity (3.8 × 10–3 S cm􀀀 1) showed PANI-GA with dominant polyaniline (PANI) emeraldine salt segments and nanorod morphology, synthesized at [GA]/[aniline] = 0.1. FTIR spectroscopy confirmed the presence of covalently bonded GA and PANI-type structural segments in PANI-GA. The antioxidant activity of PANI-GA was explored by the spectrophotometric 2,2′ -azino-bis(3-ethylbenzothiazoline-6-sulfonic acid (ABTS) assay and electrochemical test for superoxide anion radical, •O2􀀀 . All protonated PANI-GA showed good scavenging activity toward ABTS•+ and •O2􀀀 radicals, whereby the highest activity exhibited PANI-GA produced at [GA]/[aniline] = 1. The radical scavenging activity of protonated PANI-GA samples toward ABTS•+ was much higher than that of PANI. The antimicrobial properties of the PANI-GA against bacteria S. aureus and E. coli, as well as against fungus C. albicans were evaluated. All synthesized protonated PANI-GA were more effective as S. aureus growth inhibitors than pristine GA and PANI. Highest effectiveness against E. coli and C. albicans, higher than that of pristine GA and PANI, showed conductive PANI-GA synthesized at [GA]/[aniline]= 0.1. Based on the obtained experimental results the mechanism of GA and aniline oxidative copolymerization is proposed.
PB  - Elsevier Ltd
T2  - Synthetic Metals
T1  - Copolymerization of aniline and gallic acid: Novel electroactive materials with antioxidant and antimicrobial activities
VL  - 286
DO  - 10.1016/j.synthmet.2022.117048
ER  - 

@article{
author = "Janošević-Ležaić, Aleksandra and Pašti, Igor and Gledović, Ana and Antić-Stanković, Jelena and Božić, Dragana and Uskoković-Marković, Snežana and Ćirić-Marjanović, Gordana",
year = "2022",
abstract = "Novel electroactive PANI-GA micro/nanostructured functional copolymers/co-oligomers were synthesized by the oxidative copolymerization of aniline and gallic acid (GA) in an aqueous solution, using ammonium peroxydisulfate (APS) as an oxidant and different initial mole ratios of GA to aniline ([GA]/[aniline]=0.1, 0.25, 0.5 and 1.0). It was found that the yield, molecular structure, morphology, electrical conductivity, electrochemical behavior, antioxidant and antimicrobial properties of PANI-GA strongly depend on [GA]/[aniline] ratio. The highest conductivity (3.8 × 10–3 S cm􀀀 1) showed PANI-GA with dominant polyaniline (PANI) emeraldine salt segments and nanorod morphology, synthesized at [GA]/[aniline] = 0.1. FTIR spectroscopy confirmed the presence of covalently bonded GA and PANI-type structural segments in PANI-GA. The antioxidant activity of PANI-GA was explored by the spectrophotometric 2,2′ -azino-bis(3-ethylbenzothiazoline-6-sulfonic acid (ABTS) assay and electrochemical test for superoxide anion radical, •O2􀀀 . All protonated PANI-GA showed good scavenging activity toward ABTS•+ and •O2􀀀 radicals, whereby the highest activity exhibited PANI-GA produced at [GA]/[aniline] = 1. The radical scavenging activity of protonated PANI-GA samples toward ABTS•+ was much higher than that of PANI. The antimicrobial properties of the PANI-GA against bacteria S. aureus and E. coli, as well as against fungus C. albicans were evaluated. All synthesized protonated PANI-GA were more effective as S. aureus growth inhibitors than pristine GA and PANI. Highest effectiveness against E. coli and C. albicans, higher than that of pristine GA and PANI, showed conductive PANI-GA synthesized at [GA]/[aniline]= 0.1. Based on the obtained experimental results the mechanism of GA and aniline oxidative copolymerization is proposed.",
publisher = "Elsevier Ltd",
journal = "Synthetic Metals",
title = "Copolymerization of aniline and gallic acid: Novel electroactive materials with antioxidant and antimicrobial activities",
volume = "286",
doi = "10.1016/j.synthmet.2022.117048"
}

Janošević-Ležaić, A., Pašti, I., Gledović, A., Antić-Stanković, J., Božić, D., Uskoković-Marković, S.,& Ćirić-Marjanović, G.. (2022). Copolymerization of aniline and gallic acid: Novel electroactive materials with antioxidant and antimicrobial activities. in Synthetic Metals
Elsevier Ltd., 286.
https://doi.org/10.1016/j.synthmet.2022.117048

Janošević-Ležaić A, Pašti I, Gledović A, Antić-Stanković J, Božić D, Uskoković-Marković S, Ćirić-Marjanović G. Copolymerization of aniline and gallic acid: Novel electroactive materials with antioxidant and antimicrobial activities. in Synthetic Metals. 2022;286.
doi:10.1016/j.synthmet.2022.117048 .

Janošević-Ležaić, Aleksandra, Pašti, Igor, Gledović, Ana, Antić-Stanković, Jelena, Božić, Dragana, Uskoković-Marković, Snežana, Ćirić-Marjanović, Gordana, "Copolymerization of aniline and gallic acid: Novel electroactive materials with antioxidant and antimicrobial activities" in Synthetic Metals, 286 (2022),
https://doi.org/10.1016/j.synthmet.2022.117048 . .

TY  - JOUR
AU  - Milojević-Rakić, Maja
AU  - Popadić, Daliborka
AU  - Janošević-Ležaić, Aleksandra
AU  - Jevremović, Anka
AU  - Nedić-Vasiljević, Bojana
AU  - Uskoković-Marković, Snežana
AU  - Bajuk-Bogdanović, Danica
PY  - 2022
UR  - https://farfar.pharmacy.bg.ac.rs/handle/123456789/4062
AB  - Ecotoxicity caused by neonicotinoid pesticides is largely due to oxidative stress on non-target species. Due to the fact that reactive radical species reach the environment, materials intended for pesticide removal should be applicable for the simultaneous removal of reactive radicals, as well. This work uses the spectroscopic, adsorptive and antioxidant responses from MFI, FAU and BEA zeolites as descriptors of their potential environmental importance. Different network structures and Si/Al ratios were correlated with excellent zeolite adsorption properties, as over 200 mg g1 of investigated neonicotinoids, acetamiprid and imidacloprid, was achieved in one cycle. Additionally, after two regeneration steps, over 450 mg g1 adsorbed pesticides were retained, in three adsorption cycles. Overall the best results were detected for the FAU zeotype in both tested applications, insecticide adsorption and radical-scavenging performance, with and without insecticides present. The proposed mechanism for adsorption relies on kinetic investigation, isotherm modelling and spectroscopic post-adsorption analysis and targets zeolite hydroxyl/siloxane groups as active sites for insecticide adsorption via hydrogen bonding. Neat, welldefined zeolite structures enable their prospective application in ecotoxic species removal.
PB  - The Royal Society of Chemistry
T2  - Environmental science. Processes & impacts
T1  - MFI, BEA and FAU zeolite scavenging role in neonicotinoids and radical species elimination
VL  - 24
IS  - 2
SP  - 265
EP  - 276
DO  - 10.1039/d1em00437a
ER  - 

@article{
author = "Milojević-Rakić, Maja and Popadić, Daliborka and Janošević-Ležaić, Aleksandra and Jevremović, Anka and Nedić-Vasiljević, Bojana and Uskoković-Marković, Snežana and Bajuk-Bogdanović, Danica",
year = "2022",
abstract = "Ecotoxicity caused by neonicotinoid pesticides is largely due to oxidative stress on non-target species. Due to the fact that reactive radical species reach the environment, materials intended for pesticide removal should be applicable for the simultaneous removal of reactive radicals, as well. This work uses the spectroscopic, adsorptive and antioxidant responses from MFI, FAU and BEA zeolites as descriptors of their potential environmental importance. Different network structures and Si/Al ratios were correlated with excellent zeolite adsorption properties, as over 200 mg g1 of investigated neonicotinoids, acetamiprid and imidacloprid, was achieved in one cycle. Additionally, after two regeneration steps, over 450 mg g1 adsorbed pesticides were retained, in three adsorption cycles. Overall the best results were detected for the FAU zeotype in both tested applications, insecticide adsorption and radical-scavenging performance, with and without insecticides present. The proposed mechanism for adsorption relies on kinetic investigation, isotherm modelling and spectroscopic post-adsorption analysis and targets zeolite hydroxyl/siloxane groups as active sites for insecticide adsorption via hydrogen bonding. Neat, welldefined zeolite structures enable their prospective application in ecotoxic species removal.",
publisher = "The Royal Society of Chemistry",
journal = "Environmental science. Processes & impacts",
title = "MFI, BEA and FAU zeolite scavenging role in neonicotinoids and radical species elimination",
volume = "24",
number = "2",
pages = "265-276",
doi = "10.1039/d1em00437a"
}

Milojević-Rakić, M., Popadić, D., Janošević-Ležaić, A., Jevremović, A., Nedić-Vasiljević, B., Uskoković-Marković, S.,& Bajuk-Bogdanović, D.. (2022). MFI, BEA and FAU zeolite scavenging role in neonicotinoids and radical species elimination. in Environmental science. Processes & impacts
The Royal Society of Chemistry., 24(2), 265-276.
https://doi.org/10.1039/d1em00437a

Milojević-Rakić M, Popadić D, Janošević-Ležaić A, Jevremović A, Nedić-Vasiljević B, Uskoković-Marković S, Bajuk-Bogdanović D. MFI, BEA and FAU zeolite scavenging role in neonicotinoids and radical species elimination. in Environmental science. Processes & impacts. 2022;24(2):265-276.
doi:10.1039/d1em00437a .

Milojević-Rakić, Maja, Popadić, Daliborka, Janošević-Ležaić, Aleksandra, Jevremović, Anka, Nedić-Vasiljević, Bojana, Uskoković-Marković, Snežana, Bajuk-Bogdanović, Danica, "MFI, BEA and FAU zeolite scavenging role in neonicotinoids and radical species elimination" in Environmental science. Processes & impacts, 24, no. 2 (2022):265-276,
https://doi.org/10.1039/d1em00437a . .

TY  - JOUR
AU  - Mijailović, Nataša R.
AU  - Nedić Vasiljević, Bojana
AU  - Ranković, Maja
AU  - Milanović, Vladimir
AU  - Uskoković-Marković, Snežana
PY  - 2022
UR  - https://farfar.pharmacy.bg.ac.rs/handle/123456789/4266
AB  - Zeolites belong to aluminosilicate microporous solids, with strong and diverse catalytic
activity, which makes them applicable in almost every kind of industrial process, particularly thanks
to their eco-friendly profile. Another crucial characteristic of zeolites is their tremendous adsorption
capability. Therefore, it is self-evident that the widespread use of zeolites is in environmental
protection, based primarily on the adsorption capacity of substances potentially harmful to the
environment, such as pharmaceuticals, pesticides, or other industry pollutants. On the other hand,
zeolites are also recognized as drug delivery systems (DDS) carriers for numerous pharmacologically
active agents. The enhanced bioactive ability of DDS zeolite as a drug carrying nanoplatform is
confirmed, making this system more specific and efficient, compared to the drug itself. These two
applications of zeolite, in fact, illustrate the importance of (ir)reversibility of the adsorption process.
This review gives deep insight into the balance and dynamics that are established during that
process, i.e., the interaction between zeolites and pharmaceuticals, helping scientists to expand their
knowledge necessarily for a more effective application of the adsorption phenomenon of zeolites.
PB  - MDPI
T2  - Catalysts
T1  - Environmental and Pharmacokinetic Aspects of Zeolite/Pharmaceuticals Systems—Two Facets of Adsorption Ability
VL  - 12
IS  - 8
DO  - 10.3390/catal12080837
ER  - 

@article{
author = "Mijailović, Nataša R. and Nedić Vasiljević, Bojana and Ranković, Maja and Milanović, Vladimir and Uskoković-Marković, Snežana",
year = "2022",
abstract = "Zeolites belong to aluminosilicate microporous solids, with strong and diverse catalytic
activity, which makes them applicable in almost every kind of industrial process, particularly thanks
to their eco-friendly profile. Another crucial characteristic of zeolites is their tremendous adsorption
capability. Therefore, it is self-evident that the widespread use of zeolites is in environmental
protection, based primarily on the adsorption capacity of substances potentially harmful to the
environment, such as pharmaceuticals, pesticides, or other industry pollutants. On the other hand,
zeolites are also recognized as drug delivery systems (DDS) carriers for numerous pharmacologically
active agents. The enhanced bioactive ability of DDS zeolite as a drug carrying nanoplatform is
confirmed, making this system more specific and efficient, compared to the drug itself. These two
applications of zeolite, in fact, illustrate the importance of (ir)reversibility of the adsorption process.
This review gives deep insight into the balance and dynamics that are established during that
process, i.e., the interaction between zeolites and pharmaceuticals, helping scientists to expand their
knowledge necessarily for a more effective application of the adsorption phenomenon of zeolites.",
publisher = "MDPI",
journal = "Catalysts",
title = "Environmental and Pharmacokinetic Aspects of Zeolite/Pharmaceuticals Systems—Two Facets of Adsorption Ability",
volume = "12",
number = "8",
doi = "10.3390/catal12080837"
}

Mijailović, N. R., Nedić Vasiljević, B., Ranković, M., Milanović, V.,& Uskoković-Marković, S.. (2022). Environmental and Pharmacokinetic Aspects of Zeolite/Pharmaceuticals Systems—Two Facets of Adsorption Ability. in Catalysts
MDPI., 12(8).
https://doi.org/10.3390/catal12080837

Mijailović NR, Nedić Vasiljević B, Ranković M, Milanović V, Uskoković-Marković S. Environmental and Pharmacokinetic Aspects of Zeolite/Pharmaceuticals Systems—Two Facets of Adsorption Ability. in Catalysts. 2022;12(8).
doi:10.3390/catal12080837 .

Mijailović, Nataša R., Nedić Vasiljević, Bojana, Ranković, Maja, Milanović, Vladimir, Uskoković-Marković, Snežana, "Environmental and Pharmacokinetic Aspects of Zeolite/Pharmaceuticals Systems—Two Facets of Adsorption Ability" in Catalysts, 12, no. 8 (2022),
https://doi.org/10.3390/catal12080837 . .

TY  - JOUR
AU  - Mravik, Željko
AU  - Bajuk-Bogdanović, Danica
AU  - Jovanović, Sonja
AU  - Rmuš, Jelena
AU  - Olejniczak, Andrzej
AU  - Mraković, Ana
AU  - Lazarević, Jasmina
AU  - Uskoković-Marković, Snežana
AU  - Lazarević, Nenad
AU  - Skuratov, Vladimir
AU  - Jovanović, Zoran
PY  - 2022
UR  - https://farfar.pharmacy.bg.ac.rs/handle/123456789/4246
AB  - Ion beam irradiation is a versatile tool for structural modification andengineering of new materials. In this study, 12-tungstophosphoric acid (WPA)films of different thickness were spin-coated on platinized silicon substrate andirradiated with low energy hydrogen ions (10 keV) and swift heavy ions (Bi,Xe, and V) with energies up to 710 MeV. The different energy/fluence combi-nations allowed controllable structural changes that were investigated in detailusing Raman and Infrared spectroscopy. For 120-nm-thick WPA samples, theirradiation led to the decrease of intensity of the skeletal and W-Oc-W bands ofKeggin anion in order: Bi < V < Xe (for their applied energy/fluence combina-tion). Also, symmetry change of Keggin anion similar to the one observed inthe case of Keggin anions interacting with the supports was observed. For theselected ion beam irradiation parameters, xenon ion beam induced transforma-tion of WPA to polytungstate. For 20-μm-thick WPA samples, the irradiationwith hydrogen ion beam induced changes of skeletal vibrations and increasedindividualistic behavior of Keggin anions. As the fluence increased, theamount of the Keggin anions partially transformed to bronze also increased.Irradiation with vanadium also caused transformation to bronze-like structurebut with higher ratio of terminal W=Odbonds. The overall results show clearReceived: 9 February 2022Revised: 17 June 2022Accepted: 5 July 2022DOI: 10.1002/jrs.6423J Raman Spectrosc.2022;1–11.wileyonlinelibrary.com/journal/jrs© 2022 John Wiley & Sons Ltd.1correlation between degree of structural modification of WPA and thecalculated displacement per atom value. These results open possibilities forengineering new catalytically active structures of polyoxometalates with thehelp of ion beams.
PB  - John Wiley and Sons Ltd
T2  - Journal of Raman Spectroscopy
T1  - Modification of Keggin anion structure with ion beams—A new spectroscopic insights into the effects of keV- and MeV-ion beam irradiation on 12-tungstophosphoric acid
VL  - 53
IS  - 11
SP  - 1974
SP  - 8167
EP  - 1984
DO  - 10.1002/jrs.6423
ER  - 

@article{
author = "Mravik, Željko and Bajuk-Bogdanović, Danica and Jovanović, Sonja and Rmuš, Jelena and Olejniczak, Andrzej and Mraković, Ana and Lazarević, Jasmina and Uskoković-Marković, Snežana and Lazarević, Nenad and Skuratov, Vladimir and Jovanović, Zoran",
year = "2022",
abstract = "Ion beam irradiation is a versatile tool for structural modification andengineering of new materials. In this study, 12-tungstophosphoric acid (WPA)films of different thickness were spin-coated on platinized silicon substrate andirradiated with low energy hydrogen ions (10 keV) and swift heavy ions (Bi,Xe, and V) with energies up to 710 MeV. The different energy/fluence combi-nations allowed controllable structural changes that were investigated in detailusing Raman and Infrared spectroscopy. For 120-nm-thick WPA samples, theirradiation led to the decrease of intensity of the skeletal and W-Oc-W bands ofKeggin anion in order: Bi < V < Xe (for their applied energy/fluence combina-tion). Also, symmetry change of Keggin anion similar to the one observed inthe case of Keggin anions interacting with the supports was observed. For theselected ion beam irradiation parameters, xenon ion beam induced transforma-tion of WPA to polytungstate. For 20-μm-thick WPA samples, the irradiationwith hydrogen ion beam induced changes of skeletal vibrations and increasedindividualistic behavior of Keggin anions. As the fluence increased, theamount of the Keggin anions partially transformed to bronze also increased.Irradiation with vanadium also caused transformation to bronze-like structurebut with higher ratio of terminal W=Odbonds. The overall results show clearReceived: 9 February 2022Revised: 17 June 2022Accepted: 5 July 2022DOI: 10.1002/jrs.6423J Raman Spectrosc.2022;1–11.wileyonlinelibrary.com/journal/jrs© 2022 John Wiley & Sons Ltd.1correlation between degree of structural modification of WPA and thecalculated displacement per atom value. These results open possibilities forengineering new catalytically active structures of polyoxometalates with thehelp of ion beams.",
publisher = "John Wiley and Sons Ltd",
journal = "Journal of Raman Spectroscopy",
title = "Modification of Keggin anion structure with ion beams—A new spectroscopic insights into the effects of keV- and MeV-ion beam irradiation on 12-tungstophosphoric acid",
volume = "53",
number = "11",
pages = "1974-8167-1984",
doi = "10.1002/jrs.6423"
}

Mravik, Ž., Bajuk-Bogdanović, D., Jovanović, S., Rmuš, J., Olejniczak, A., Mraković, A., Lazarević, J., Uskoković-Marković, S., Lazarević, N., Skuratov, V.,& Jovanović, Z.. (2022). Modification of Keggin anion structure with ion beams—A new spectroscopic insights into the effects of keV- and MeV-ion beam irradiation on 12-tungstophosphoric acid. in Journal of Raman Spectroscopy
John Wiley and Sons Ltd., 53(11), 1974-1984.
https://doi.org/10.1002/jrs.6423

Mravik Ž, Bajuk-Bogdanović D, Jovanović S, Rmuš J, Olejniczak A, Mraković A, Lazarević J, Uskoković-Marković S, Lazarević N, Skuratov V, Jovanović Z. Modification of Keggin anion structure with ion beams—A new spectroscopic insights into the effects of keV- and MeV-ion beam irradiation on 12-tungstophosphoric acid. in Journal of Raman Spectroscopy. 2022;53(11):1974-1984.
doi:10.1002/jrs.6423 .

Mravik, Željko, Bajuk-Bogdanović, Danica, Jovanović, Sonja, Rmuš, Jelena, Olejniczak, Andrzej, Mraković, Ana, Lazarević, Jasmina, Uskoković-Marković, Snežana, Lazarević, Nenad, Skuratov, Vladimir, Jovanović, Zoran, "Modification of Keggin anion structure with ion beams—A new spectroscopic insights into the effects of keV- and MeV-ion beam irradiation on 12-tungstophosphoric acid" in Journal of Raman Spectroscopy, 53, no. 11 (2022):1974-1984,
https://doi.org/10.1002/jrs.6423 . .

TY  - CONF
AU  - Gledović, Ana
AU  - Bajuk-Bogdanović, Danica
AU  - Uskoković-Marković, Snežana
AU  - Pavun, Leposava
AU  - Savić, Snežana
AU  - Janošević-Ležaić, Aleksandra
PY  - 2021
UR  - https://farfar.pharmacy.bg.ac.rs/handle/123456789/4673
AB  - Aromatic plants have been used since ancient times as a source of essential oils (EOs)
which are known as natural remedies in traditional medicine systems – phytotherapy and
aromatherapy, but they are also widely used for everyday purposes (for example, as fragrant
components in skincare preparations and perfumery; as flavours and natural preservatives
in food industry). It is known that many EOs contain molecules with considerable
antioxidant activity, such as phenolic compounds, flavonoids and terpenoids, acting alone or
synergistically. Besides antimicrobial action, EOs prepared from plants form the Lamiaceae
family, such as basil −BA (Ocimum basilicum), oregano – OR (Origanum vulgare) and lemon
balm − LB (Melissa officinalis) leaves are reported to scavenge free radicals (1). Therefore,
these particular EOs and their bioactives could be good candidates for skin-protective
formulations. Nanoemulsions (NEs), especially those produced by low energy methods, are
recently proposed as prospective carriers for sensitive and natural ingredients such as EOs,
in order to ensure their stabilization. Additionally, some EOs can act as cosurfactants and
promote low energy nanoemulsification. Having in mind that EOs cannot be used undiluted,
oil-in-water NEs could be an appropriate delivery system, representing fluid formulations
with ultra-fine droplets, pleasant visual appearance, and improved stability compared to
classic macroemulsions (2). Firstly, NEs were prepared different EOs (BA, OR or LB) with
polyethylene glycol free (PEG-free) natural surfactants/emollients mixture (containing
polyglycerol-4 laurate as the main surfactant) suitable for cold processing via the Phase
inversion composition (PIC) method. NEs physicochemical stability was confirmed by
particle size distribution analysis, electrical conductivity and pH value measurements, as
well as by optical microscopy observations. The type of EO and the concentration of
surfactants/emollient mixture were proven to be crucial factors governing NE properties
and stability. Raman spectra of EOs verified their main active ingredients and detected
possible interactions with the nanocarrier (3). The antioxidant activity towards the DPPH
radical in methanol was concentration-dependent with a similar trend for neat oils and oil-
loaded NEs (OR> LB> BA). However, the ABTS test in an aqueous medium revealed notable
change in the order of activity with increased EO concentration and after EO nanonisation.
Overall, the highest antioxidant activity was observed for OR and OR-loaded NE (> 95%
INH ABTS and > 85% INH DPPH), implying at some optimal package of OR within the nanocarrier
which preserved its high antioxidant performance and ensured its stability during 6 months
of storage.
AB  - Aromatične biljke koriste se od davnina za dobijanje etarskih ulja (EOs) koja su
poznata kao prirodni lekovi u tradicionalnim sistemima lečenja – fitoterapiji i aromaterapiji,
a takođe je široko rasprostranjena njihova upotreba u svakodnevnom životu (na primer, kao
mirisne komponente u kozmetičkim proizvodima i parfemima; kao korigensi ukusa i
prirodni konzervansi u prehrambenoj industriji). Brojna EOs sadrže molekule kao što su
fenolna jedinjenja, flavonoidi i terpenoidi koji ispoljavaju značajnu antioksidativnu aktivnost,
delujući samostalno ili sinergistički. Pored antimikrobnog dejstva, EOs dobijena iz listova
biljaka familije Lamiaceae, kao što je bosiljak - BA (Ocimum basilicum), origano – OR
(Origanum vulgare) i matičnjak − LB (Melissa officinalis) deluju kao hvatači slobodnih
radikala (1). Prema tome, pomenuta EOs i njihovi bioaktivni sastojci mogu biti dobri
kandidati za razvoj formulacija za zaštitu kože. Nanoemulzije (NEs), posebno one
proizvedene niskoenergetskim metodama, odnedavno se predlažu kao prospektivni nosači
za prirodne i osetljive sastojke poput EOs, sa ciljem da se obezbedi njihova stabilizacija.
Dodatno, neka EOs imaju ulogu kosurfaktanta i pospešuju niskoenergetsku
nanoemulzifikaciju. Imajući u vidu da se EOs ne mogu koristiti nerazblažena, NEs ulje u vodi
tipa mogu biti adekvatni nosači, s obzirom da su u pitanju fluidne formulacije sa ultra-finim
veličinama kapi, prijatnim vizuelnim izgledom, kao i poboljšanom stabilnošću u poređenju sa
klasičnim makroemulzijama (2). Prvo su pripremljene NEs sa različitim EOs (BA, OR ili LB),
sa smešom prirodnim surfaktanata i emolijensa (bez polietilenglikola - PEG, gde je
poligliceril-4 laurat glavni surfaktant) koja je pogodna za izradu na hladno primenom
metode inverzije faza (engl. Phase inversion composition ‐ PIC method). Fizičkohemijska
stabilnost NEs potvrđena je analizom distribucije veličina kapi, merenjem električne
provodljivosti i pH vrednosti, kao i optičkom mikroskopijom. Nađeno je da su vrsta EO i
koncentracija smeše surfaktanata i emolijensa ključni faktori koji utiču na karakteristike i
stabilnost dobijenih NE. Tehnikom Ramanske spektroskopije potvrđeni su glavni aktivni
sastojci etarskih ulja i detektovane su moguće interakcije sa nanonosačem. Pokazano je da je
antioksidativna aktivnost prema DPPH radikalu u metanolu koncentraciono zavisna, sa
sličnim trendom za čista etarska ulja i za NEs sa uljima (OR> LB> BA). Međutim, ABTS test u
vodenoj sredini pokazao je izrazite promene u redosledu aktivnosti sa povećanjem
koncentracije EO i nakon nanonizacije EO. Generalno, najjača aktioksidativna aktivnost
primećena je u slučaju OR i OR-NE (> 95% INH ABTS i > 85% INH DPPH), što ukazuje na
optimalno pakovanje OR unutar nanonosača čime su očuvane njegove antioksidativne
performanse i obezbeđena stabilnost tokom 6 meseci čuvanja.
PB  - Savez farmaceutskih udruženja Srbije (SFUS)
C3  - Arhiv za farmaciju
T1  - Low energy nanoemulsions as potential carriers for essential oils in formulations for antioxidant skin protection
T1  - Niskoenergetske nanoemulzije kao potencijalni nosači za etarska ulja u formulacijama za antioksidativnu zaštitu kože
VL  - 71
IS  - 5 suplement
SP  - S96
EP  - S99
UR  - https://hdl.handle.net/21.15107/rcub_farfar_4673
ER  - 

@conference{
author = "Gledović, Ana and Bajuk-Bogdanović, Danica and Uskoković-Marković, Snežana and Pavun, Leposava and Savić, Snežana and Janošević-Ležaić, Aleksandra",
year = "2021",
abstract = "Aromatic plants have been used since ancient times as a source of essential oils (EOs)
which are known as natural remedies in traditional medicine systems – phytotherapy and
aromatherapy, but they are also widely used for everyday purposes (for example, as fragrant
components in skincare preparations and perfumery; as flavours and natural preservatives
in food industry). It is known that many EOs contain molecules with considerable
antioxidant activity, such as phenolic compounds, flavonoids and terpenoids, acting alone or
synergistically. Besides antimicrobial action, EOs prepared from plants form the Lamiaceae
family, such as basil −BA (Ocimum basilicum), oregano – OR (Origanum vulgare) and lemon
balm − LB (Melissa officinalis) leaves are reported to scavenge free radicals (1). Therefore,
these particular EOs and their bioactives could be good candidates for skin-protective
formulations. Nanoemulsions (NEs), especially those produced by low energy methods, are
recently proposed as prospective carriers for sensitive and natural ingredients such as EOs,
in order to ensure their stabilization. Additionally, some EOs can act as cosurfactants and
promote low energy nanoemulsification. Having in mind that EOs cannot be used undiluted,
oil-in-water NEs could be an appropriate delivery system, representing fluid formulations
with ultra-fine droplets, pleasant visual appearance, and improved stability compared to
classic macroemulsions (2). Firstly, NEs were prepared different EOs (BA, OR or LB) with
polyethylene glycol free (PEG-free) natural surfactants/emollients mixture (containing
polyglycerol-4 laurate as the main surfactant) suitable for cold processing via the Phase
inversion composition (PIC) method. NEs physicochemical stability was confirmed by
particle size distribution analysis, electrical conductivity and pH value measurements, as
well as by optical microscopy observations. The type of EO and the concentration of
surfactants/emollient mixture were proven to be crucial factors governing NE properties
and stability. Raman spectra of EOs verified their main active ingredients and detected
possible interactions with the nanocarrier (3). The antioxidant activity towards the DPPH
radical in methanol was concentration-dependent with a similar trend for neat oils and oil-
loaded NEs (OR> LB> BA). However, the ABTS test in an aqueous medium revealed notable
change in the order of activity with increased EO concentration and after EO nanonisation.
Overall, the highest antioxidant activity was observed for OR and OR-loaded NE (> 95%
INH ABTS and > 85% INH DPPH), implying at some optimal package of OR within the nanocarrier
which preserved its high antioxidant performance and ensured its stability during 6 months
of storage., Aromatične biljke koriste se od davnina za dobijanje etarskih ulja (EOs) koja su
poznata kao prirodni lekovi u tradicionalnim sistemima lečenja – fitoterapiji i aromaterapiji,
a takođe je široko rasprostranjena njihova upotreba u svakodnevnom životu (na primer, kao
mirisne komponente u kozmetičkim proizvodima i parfemima; kao korigensi ukusa i
prirodni konzervansi u prehrambenoj industriji). Brojna EOs sadrže molekule kao što su
fenolna jedinjenja, flavonoidi i terpenoidi koji ispoljavaju značajnu antioksidativnu aktivnost,
delujući samostalno ili sinergistički. Pored antimikrobnog dejstva, EOs dobijena iz listova
biljaka familije Lamiaceae, kao što je bosiljak - BA (Ocimum basilicum), origano – OR
(Origanum vulgare) i matičnjak − LB (Melissa officinalis) deluju kao hvatači slobodnih
radikala (1). Prema tome, pomenuta EOs i njihovi bioaktivni sastojci mogu biti dobri
kandidati za razvoj formulacija za zaštitu kože. Nanoemulzije (NEs), posebno one
proizvedene niskoenergetskim metodama, odnedavno se predlažu kao prospektivni nosači
za prirodne i osetljive sastojke poput EOs, sa ciljem da se obezbedi njihova stabilizacija.
Dodatno, neka EOs imaju ulogu kosurfaktanta i pospešuju niskoenergetsku
nanoemulzifikaciju. Imajući u vidu da se EOs ne mogu koristiti nerazblažena, NEs ulje u vodi
tipa mogu biti adekvatni nosači, s obzirom da su u pitanju fluidne formulacije sa ultra-finim
veličinama kapi, prijatnim vizuelnim izgledom, kao i poboljšanom stabilnošću u poređenju sa
klasičnim makroemulzijama (2). Prvo su pripremljene NEs sa različitim EOs (BA, OR ili LB),
sa smešom prirodnim surfaktanata i emolijensa (bez polietilenglikola - PEG, gde je
poligliceril-4 laurat glavni surfaktant) koja je pogodna za izradu na hladno primenom
metode inverzije faza (engl. Phase inversion composition ‐ PIC method). Fizičkohemijska
stabilnost NEs potvrđena je analizom distribucije veličina kapi, merenjem električne
provodljivosti i pH vrednosti, kao i optičkom mikroskopijom. Nađeno je da su vrsta EO i
koncentracija smeše surfaktanata i emolijensa ključni faktori koji utiču na karakteristike i
stabilnost dobijenih NE. Tehnikom Ramanske spektroskopije potvrđeni su glavni aktivni
sastojci etarskih ulja i detektovane su moguće interakcije sa nanonosačem. Pokazano je da je
antioksidativna aktivnost prema DPPH radikalu u metanolu koncentraciono zavisna, sa
sličnim trendom za čista etarska ulja i za NEs sa uljima (OR> LB> BA). Međutim, ABTS test u
vodenoj sredini pokazao je izrazite promene u redosledu aktivnosti sa povećanjem
koncentracije EO i nakon nanonizacije EO. Generalno, najjača aktioksidativna aktivnost
primećena je u slučaju OR i OR-NE (> 95% INH ABTS i > 85% INH DPPH), što ukazuje na
optimalno pakovanje OR unutar nanonosača čime su očuvane njegove antioksidativne
performanse i obezbeđena stabilnost tokom 6 meseci čuvanja.",
publisher = "Savez farmaceutskih udruženja Srbije (SFUS)",
journal = "Arhiv za farmaciju",
title = "Low energy nanoemulsions as potential carriers for essential oils in formulations for antioxidant skin protection, Niskoenergetske nanoemulzije kao potencijalni nosači za etarska ulja u formulacijama za antioksidativnu zaštitu kože",
volume = "71",
number = "5 suplement",
pages = "S96-S99",
url = "https://hdl.handle.net/21.15107/rcub_farfar_4673"
}

Gledović, A., Bajuk-Bogdanović, D., Uskoković-Marković, S., Pavun, L., Savić, S.,& Janošević-Ležaić, A.. (2021). Low energy nanoemulsions as potential carriers for essential oils in formulations for antioxidant skin protection. in Arhiv za farmaciju
Savez farmaceutskih udruženja Srbije (SFUS)., 71(5 suplement), S96-S99.
https://hdl.handle.net/21.15107/rcub_farfar_4673

Gledović A, Bajuk-Bogdanović D, Uskoković-Marković S, Pavun L, Savić S, Janošević-Ležaić A. Low energy nanoemulsions as potential carriers for essential oils in formulations for antioxidant skin protection. in Arhiv za farmaciju. 2021;71(5 suplement):S96-S99.
https://hdl.handle.net/21.15107/rcub_farfar_4673 .

Gledović, Ana, Bajuk-Bogdanović, Danica, Uskoković-Marković, Snežana, Pavun, Leposava, Savić, Snežana, Janošević-Ležaić, Aleksandra, "Low energy nanoemulsions as potential carriers for essential oils in formulations for antioxidant skin protection" in Arhiv za farmaciju, 71, no. 5 suplement (2021):S96-S99,
https://hdl.handle.net/21.15107/rcub_farfar_4673 .

TY  - JOUR
AU  - Pavun, Leposava
AU  - Janošević-Ležaić, Aleksandra
AU  - Tanasković, Slađana
AU  - Ušjak, Dušan
AU  - Milenković, Marina
AU  - Uskoković-Marković, Snežana
PY  - 2021
UR  - https://farfar.pharmacy.bg.ac.rs/handle/123456789/4055
AB  - The presence of residual cardiovascular disease (CVD) risk is a current dilemma in clinical practice; indeed, despite optimal management and treatment, a considerable proportion of patients still undergo major CV events. Novel lipoprotein biomarkers are suggested as possible targets for improving the outcomes of patients at higher risk for CVD, and their impact on major CV events and mortality have previously been investigated. Innovative antidiabetic therapies have recently shown a significant reduction in atherogenic lipoproteins, beyond their effects on glucose parameters; it has also been suggested that such anti-atherogenic effect may represent a valuable mechanistic explanation for the cardiovascular benefit of, at least, some of the novel antidiabetic agents, such as glucagon-like peptide-1 receptor agonists. This emphasizes the need for further research in the field in order to clearly assess the effects of innovative treatments on different novel biomarkers, including atherogenic lipoproteins, such as small dense low-density lipoprotein (LDL), lipoprotein(a) (Lp(a)) and dysfunctional high-density lipoprotein (HDL). The current article discusses the clinical importance of novel lipid biomarkers for better management of patients in order to overcome residual cardiovascular risk.
AB  - Постои постојана потреба од ефикасни лекови, комбинации на лекови и методи за спречување на бактериски и вирусни инфекции, вклучувајќи го и коронавирусот. Познато е дека улогата на елементи во траги во зајакнување на човековиот имун систем е значајна. Витамините, микроелементите, вклучувајќи цинк, железо, селен, магнезиум и бакар, масните киселини омега-3 играат значајна физиолошка улога во унапредување на имуниот систем. Цинкот е неопходен микроелемент за основните ензимски физиолошки процеси. Тој игра важна улога во делбата на клетките и е вклучен во развојот на клетки одговорни за неспецифичен имунитет. Познато е дека недостигот на цинк ги предиспонира пациентите на вирусни инфекции поради намалениот антивирусен имунитет. Од друга страна, флавоноидите како метаболити на растенијата играат важна улога во спречување на оксидативен стрес. Овој труд има за цел да ја дискутира in vitro улогата на цинкот, флавонидите и нивните комплекси, како и нивните антиоксидативни и антимикорбни активности. Разгледана е и оправданоста за истовремена употреба на цинк и флавоноиди.
PB  - Macedonian Journal of Chemistry and Chemical Engineering
T2  - Macedonian Journal of Chemistry and Chemical Engineering
T1  - Antioxidant capacity and antimicrobial effects of zinc complexes of flavonoids – does synergism exist?
T1  - Aнтиоксидативен капацитет и антимикробни ефекти на комплекси
на цинк со флавоноиди – дали постои синергизам?
VL  - 40
IS  - 2
SP  - 231
EP  - 239
DO  - 10.20450/mjcce.2021.2401
ER  - 

@article{
author = "Pavun, Leposava and Janošević-Ležaić, Aleksandra and Tanasković, Slađana and Ušjak, Dušan and Milenković, Marina and Uskoković-Marković, Snežana",
year = "2021",
abstract = "The presence of residual cardiovascular disease (CVD) risk is a current dilemma in clinical practice; indeed, despite optimal management and treatment, a considerable proportion of patients still undergo major CV events. Novel lipoprotein biomarkers are suggested as possible targets for improving the outcomes of patients at higher risk for CVD, and their impact on major CV events and mortality have previously been investigated. Innovative antidiabetic therapies have recently shown a significant reduction in atherogenic lipoproteins, beyond their effects on glucose parameters; it has also been suggested that such anti-atherogenic effect may represent a valuable mechanistic explanation for the cardiovascular benefit of, at least, some of the novel antidiabetic agents, such as glucagon-like peptide-1 receptor agonists. This emphasizes the need for further research in the field in order to clearly assess the effects of innovative treatments on different novel biomarkers, including atherogenic lipoproteins, such as small dense low-density lipoprotein (LDL), lipoprotein(a) (Lp(a)) and dysfunctional high-density lipoprotein (HDL). The current article discusses the clinical importance of novel lipid biomarkers for better management of patients in order to overcome residual cardiovascular risk., Постои постојана потреба од ефикасни лекови, комбинации на лекови и методи за спречување на бактериски и вирусни инфекции, вклучувајќи го и коронавирусот. Познато е дека улогата на елементи во траги во зајакнување на човековиот имун систем е значајна. Витамините, микроелементите, вклучувајќи цинк, железо, селен, магнезиум и бакар, масните киселини омега-3 играат значајна физиолошка улога во унапредување на имуниот систем. Цинкот е неопходен микроелемент за основните ензимски физиолошки процеси. Тој игра важна улога во делбата на клетките и е вклучен во развојот на клетки одговорни за неспецифичен имунитет. Познато е дека недостигот на цинк ги предиспонира пациентите на вирусни инфекции поради намалениот антивирусен имунитет. Од друга страна, флавоноидите како метаболити на растенијата играат важна улога во спречување на оксидативен стрес. Овој труд има за цел да ја дискутира in vitro улогата на цинкот, флавонидите и нивните комплекси, како и нивните антиоксидативни и антимикорбни активности. Разгледана е и оправданоста за истовремена употреба на цинк и флавоноиди.",
publisher = "Macedonian Journal of Chemistry and Chemical Engineering",
journal = "Macedonian Journal of Chemistry and Chemical Engineering",
title = "Antioxidant capacity and antimicrobial effects of zinc complexes of flavonoids – does synergism exist?, Aнтиоксидативен капацитет и антимикробни ефекти на комплекси
на цинк со флавоноиди – дали постои синергизам?",
volume = "40",
number = "2",
pages = "231-239",
doi = "10.20450/mjcce.2021.2401"
}

Pavun, L., Janošević-Ležaić, A., Tanasković, S., Ušjak, D., Milenković, M.,& Uskoković-Marković, S.. (2021). Antioxidant capacity and antimicrobial effects of zinc complexes of flavonoids – does synergism exist?. in Macedonian Journal of Chemistry and Chemical Engineering
Macedonian Journal of Chemistry and Chemical Engineering., 40(2), 231-239.
https://doi.org/10.20450/mjcce.2021.2401

Pavun L, Janošević-Ležaić A, Tanasković S, Ušjak D, Milenković M, Uskoković-Marković S. Antioxidant capacity and antimicrobial effects of zinc complexes of flavonoids – does synergism exist?. in Macedonian Journal of Chemistry and Chemical Engineering. 2021;40(2):231-239.
doi:10.20450/mjcce.2021.2401 .

Pavun, Leposava, Janošević-Ležaić, Aleksandra, Tanasković, Slađana, Ušjak, Dušan, Milenković, Marina, Uskoković-Marković, Snežana, "Antioxidant capacity and antimicrobial effects of zinc complexes of flavonoids – does synergism exist?" in Macedonian Journal of Chemistry and Chemical Engineering, 40, no. 2 (2021):231-239,
https://doi.org/10.20450/mjcce.2021.2401 . .

TY  - JOUR
AU  - Janićijević, Dejana
AU  - Jevremović, Anka
AU  - Janošević-Ležaić, Aleksandra
AU  - Nedić-Vasiljević, Bojana
AU  - Uskoković-Marković, Snežana
AU  - Bajuk-Bogdanović, Danica
AU  - Milojević-Rakić, Maja
PY  - 2021
UR  - https://farfar.pharmacy.bg.ac.rs/handle/123456789/3970
AB  - Composite materials consisting of the silver salt of dodecatungstophosphoric acid and HBEA zeolite are developed in order to give materials of superior adsorption properties for aqueous pesticide removal. Two-step impregnation and an ion-exchange method with variable constituent mass ratios were employed as synthesis procedures. One of the study goals was to optimize the composite preparation for efficient elimination of glyphosate pesticide and to investigate the modulation of antioxidant activity in the presence of pesticide. Based on comprehensive results, we propose mechanisms for simultaneous glyphosate removal and antioxidant activity. Spectroscopic analysis shows that the applied two-step impregnation method results in advanced composite materials with evenly distributed active sites for glyphosate adsorption and radical-scavenging activity. The original Krishnamurti isotherm is successfully used to fit pesticide adsorption data, pointing to co-operative adsorption of glyphosate on partly saturated adsorbents sites. The amount of glyphosate adsorbed from water suspension was 378 mg per gram of composite material, the highest value reported for glyphosate removal to date.
PB  - Elsevier Ltd
T2  - Journal of Environmental Chemical Engineering
T1  - Comparative assessment of pesticide adsorption capacity and antioxidant activity of Silver Dodecatungstophosphate/HΒEA zeolite composites
VL  - 9
IS  - 6
DO  - 10.1016/j.jece.2021.106341
ER  - 

@article{
author = "Janićijević, Dejana and Jevremović, Anka and Janošević-Ležaić, Aleksandra and Nedić-Vasiljević, Bojana and Uskoković-Marković, Snežana and Bajuk-Bogdanović, Danica and Milojević-Rakić, Maja",
year = "2021",
abstract = "Composite materials consisting of the silver salt of dodecatungstophosphoric acid and HBEA zeolite are developed in order to give materials of superior adsorption properties for aqueous pesticide removal. Two-step impregnation and an ion-exchange method with variable constituent mass ratios were employed as synthesis procedures. One of the study goals was to optimize the composite preparation for efficient elimination of glyphosate pesticide and to investigate the modulation of antioxidant activity in the presence of pesticide. Based on comprehensive results, we propose mechanisms for simultaneous glyphosate removal and antioxidant activity. Spectroscopic analysis shows that the applied two-step impregnation method results in advanced composite materials with evenly distributed active sites for glyphosate adsorption and radical-scavenging activity. The original Krishnamurti isotherm is successfully used to fit pesticide adsorption data, pointing to co-operative adsorption of glyphosate on partly saturated adsorbents sites. The amount of glyphosate adsorbed from water suspension was 378 mg per gram of composite material, the highest value reported for glyphosate removal to date.",
publisher = "Elsevier Ltd",
journal = "Journal of Environmental Chemical Engineering",
title = "Comparative assessment of pesticide adsorption capacity and antioxidant activity of Silver Dodecatungstophosphate/HΒEA zeolite composites",
volume = "9",
number = "6",
doi = "10.1016/j.jece.2021.106341"
}

Janićijević, D., Jevremović, A., Janošević-Ležaić, A., Nedić-Vasiljević, B., Uskoković-Marković, S., Bajuk-Bogdanović, D.,& Milojević-Rakić, M.. (2021). Comparative assessment of pesticide adsorption capacity and antioxidant activity of Silver Dodecatungstophosphate/HΒEA zeolite composites. in Journal of Environmental Chemical Engineering
Elsevier Ltd., 9(6).
https://doi.org/10.1016/j.jece.2021.106341

Janićijević D, Jevremović A, Janošević-Ležaić A, Nedić-Vasiljević B, Uskoković-Marković S, Bajuk-Bogdanović D, Milojević-Rakić M. Comparative assessment of pesticide adsorption capacity and antioxidant activity of Silver Dodecatungstophosphate/HΒEA zeolite composites. in Journal of Environmental Chemical Engineering. 2021;9(6).
doi:10.1016/j.jece.2021.106341 .

Janićijević, Dejana, Jevremović, Anka, Janošević-Ležaić, Aleksandra, Nedić-Vasiljević, Bojana, Uskoković-Marković, Snežana, Bajuk-Bogdanović, Danica, Milojević-Rakić, Maja, "Comparative assessment of pesticide adsorption capacity and antioxidant activity of Silver Dodecatungstophosphate/HΒEA zeolite composites" in Journal of Environmental Chemical Engineering, 9, no. 6 (2021),
https://doi.org/10.1016/j.jece.2021.106341 . .

TY  - JOUR
AU  - Pavun, Leposava
AU  - Janošević-Ležaić, Aleksandra
AU  - Uskoković-Marković, Snežana
PY  - 2021
UR  - https://farfar.pharmacy.bg.ac.rs/handle/123456789/3809
AB  - Morin is one of the flavonoids with intensive antioxidant activity. With the aim to use its benefits on human health, there is an increasing trend to pay attention to its content in food or supplements.  The  simplicity  and low  cost  of  spectrophotometric determination  based  on  the formation of a morin complex with Zn2+ ion (stoichiometric ratio 1 : 1), at pH 7.98 and 392 nm, give  it  an  advantage  over  other  methods  that  can  be  used  for  morin  quantification.  The concentration range over which the response was linear was 0.151 – 4.533 mg L-1. The limit of detection (LOD) and the limit of quantification (LOQ) were 0.030 mg L-1 and 0.091 mg L-1, respectively. The developed method was successfully applied for the determination of the morin content in strawberries. Additionally, the antioxidative abilities of strawberry extracts and morin, determined by DPPH and FRAP tests, were compared and discussed.
AB  - Morin je jedan od flavonoida sa vrlo izraženom antioksidantnom aktivnošću. Sa ciljem korišćenja njegovih pozitivnih efekata na ljudsko zdravlje, u porastu je trend interesovanja za njegov sadržaj u hrani ili suplementima. U radu je predstavljena jednostavna i pristupačna spektrofotometrijska metoda određivanja morina, zasnovana na formiranju kompleksa morina sa Zn2+ jonom (u stehiometrijskom odnosu 1 : 1, na pH 7,98 i 392 nm), što joj daje prednost u odnosu na druge metode koje se mogu koristiti za kvantifikaciju morina. Metoda pokazuje linearnost odgovora u koncentracionom opsegu 0,151 - 4,533 mg L-1, pri čemu limit detekcije (LOD) iznosi 0,030 mg L-1 a limit kvantifikacije metode (LOQ) je 0,091 mg L-1. Razvijena metoda je uspešno primenjena za određivanje sadržaja morina u jagodama. Takođe, prikazani su i komentarisani rezultati određivanja antioksidativne aktivnosti jagoda i morina, DPPH i FRAP testovima.
PB  - Beograd : Savez farmaceutskih udruženja Srbije
T2  - Arhiv za farmaciju
T1  - Spectrophotometric determination of morin in strawberries and their antioxidant activity
T1  - Spektrofotometrijsko određivanje sadržaja morina u jagodama i njihove antioksidantne aktivnosti
VL  - 71
IS  - 1
SP  - 55
EP  - 71
DO  - 10.5937/arhfarm71-30503
ER  - 

@article{
author = "Pavun, Leposava and Janošević-Ležaić, Aleksandra and Uskoković-Marković, Snežana",
year = "2021",
abstract = "Morin is one of the flavonoids with intensive antioxidant activity. With the aim to use its benefits on human health, there is an increasing trend to pay attention to its content in food or supplements.  The  simplicity  and low  cost  of  spectrophotometric determination  based  on  the formation of a morin complex with Zn2+ ion (stoichiometric ratio 1 : 1), at pH 7.98 and 392 nm, give  it  an  advantage  over  other  methods  that  can  be  used  for  morin  quantification.  The concentration range over which the response was linear was 0.151 – 4.533 mg L-1. The limit of detection (LOD) and the limit of quantification (LOQ) were 0.030 mg L-1 and 0.091 mg L-1, respectively. The developed method was successfully applied for the determination of the morin content in strawberries. Additionally, the antioxidative abilities of strawberry extracts and morin, determined by DPPH and FRAP tests, were compared and discussed., Morin je jedan od flavonoida sa vrlo izraženom antioksidantnom aktivnošću. Sa ciljem korišćenja njegovih pozitivnih efekata na ljudsko zdravlje, u porastu je trend interesovanja za njegov sadržaj u hrani ili suplementima. U radu je predstavljena jednostavna i pristupačna spektrofotometrijska metoda određivanja morina, zasnovana na formiranju kompleksa morina sa Zn2+ jonom (u stehiometrijskom odnosu 1 : 1, na pH 7,98 i 392 nm), što joj daje prednost u odnosu na druge metode koje se mogu koristiti za kvantifikaciju morina. Metoda pokazuje linearnost odgovora u koncentracionom opsegu 0,151 - 4,533 mg L-1, pri čemu limit detekcije (LOD) iznosi 0,030 mg L-1 a limit kvantifikacije metode (LOQ) je 0,091 mg L-1. Razvijena metoda je uspešno primenjena za određivanje sadržaja morina u jagodama. Takođe, prikazani su i komentarisani rezultati određivanja antioksidativne aktivnosti jagoda i morina, DPPH i FRAP testovima.",
publisher = "Beograd : Savez farmaceutskih udruženja Srbije",
journal = "Arhiv za farmaciju",
title = "Spectrophotometric determination of morin in strawberries and their antioxidant activity, Spektrofotometrijsko određivanje sadržaja morina u jagodama i njihove antioksidantne aktivnosti",
volume = "71",
number = "1",
pages = "55-71",
doi = "10.5937/arhfarm71-30503"
}

Pavun, L., Janošević-Ležaić, A.,& Uskoković-Marković, S.. (2021). Spectrophotometric determination of morin in strawberries and their antioxidant activity. in Arhiv za farmaciju
Beograd : Savez farmaceutskih udruženja Srbije., 71(1), 55-71.
https://doi.org/10.5937/arhfarm71-30503

Pavun L, Janošević-Ležaić A, Uskoković-Marković S. Spectrophotometric determination of morin in strawberries and their antioxidant activity. in Arhiv za farmaciju. 2021;71(1):55-71.
doi:10.5937/arhfarm71-30503 .

Pavun, Leposava, Janošević-Ležaić, Aleksandra, Uskoković-Marković, Snežana, "Spectrophotometric determination of morin in strawberries and their antioxidant activity" in Arhiv za farmaciju, 71, no. 1 (2021):55-71,
https://doi.org/10.5937/arhfarm71-30503 . .

TY  - JOUR
AU  - Janićijević, Dejana
AU  - Uskoković-Marković, Snežana
AU  - Popa, Alexandru
AU  - Nedić-Vasiljević, Bojana
AU  - Jevremović, Anka
AU  - Milojević-Rakić, Maja
AU  - Bajuk-Bogdanović, Danica
PY  - 2021
UR  - https://farfar.pharmacy.bg.ac.rs/handle/123456789/3792
AB  - Heteropolyacids and their salts comprise catalytic centers for the production of ethylene, one of the most important constituents in the chemical industry. The paper emphasizes different synthesis routes of hybrid materials consisting of dodecatungstophosphoric acid silver salt (AgPW) and β zeolite—stepwise wet impregnation, silver-exchange in β zeolite, and dry mixing of precursors. Composite preparation procedures induced minor effects on the weak acid sites, while strong acid sites were increased significantly. β/AgPW composites prepared by two-steps wet impregnation and ion-exchange procedures have strong acid sites content and total acidity higher in comparison to the pure AgPW salt and β zeolite. This is a result of precursors synergetic effect—cumulative strong acidic sites are generated in the presence of well-dispersed Keggin ions on the zeolite network. Composite samples with a higher content of strong acid centers exhibit higher conversion in the ethanol dehydration reaction, i.e., the ion-exchanged βAgPW sample has attained a conversion over 81%, while the wet-impregnated sample has a significant 86%. The distribution and presence of AgPW active phase are found to be crucial for both stable conversion and high selectivity results in ethylene production from ethanol, which is regarded as one of the most significant processes in environmental and sustainable industrial chemistry. Graphic abstract: [Figure not available: see fulltext.]
PB  - Springer Science and Business Media Deutschland GmbH
T2  - Chemical Papers
T1  - The impact of preparation route on the performance of silver dodecatungstophosphate/β zeolite catalysts in the ethylene production
VL  - 75
SP  - 3169
EP  - 3180
DO  - 10.1007/s11696-021-01557-3
ER  - 

@article{
author = "Janićijević, Dejana and Uskoković-Marković, Snežana and Popa, Alexandru and Nedić-Vasiljević, Bojana and Jevremović, Anka and Milojević-Rakić, Maja and Bajuk-Bogdanović, Danica",
year = "2021",
abstract = "Heteropolyacids and their salts comprise catalytic centers for the production of ethylene, one of the most important constituents in the chemical industry. The paper emphasizes different synthesis routes of hybrid materials consisting of dodecatungstophosphoric acid silver salt (AgPW) and β zeolite—stepwise wet impregnation, silver-exchange in β zeolite, and dry mixing of precursors. Composite preparation procedures induced minor effects on the weak acid sites, while strong acid sites were increased significantly. β/AgPW composites prepared by two-steps wet impregnation and ion-exchange procedures have strong acid sites content and total acidity higher in comparison to the pure AgPW salt and β zeolite. This is a result of precursors synergetic effect—cumulative strong acidic sites are generated in the presence of well-dispersed Keggin ions on the zeolite network. Composite samples with a higher content of strong acid centers exhibit higher conversion in the ethanol dehydration reaction, i.e., the ion-exchanged βAgPW sample has attained a conversion over 81%, while the wet-impregnated sample has a significant 86%. The distribution and presence of AgPW active phase are found to be crucial for both stable conversion and high selectivity results in ethylene production from ethanol, which is regarded as one of the most significant processes in environmental and sustainable industrial chemistry. Graphic abstract: [Figure not available: see fulltext.]",
publisher = "Springer Science and Business Media Deutschland GmbH",
journal = "Chemical Papers",
title = "The impact of preparation route on the performance of silver dodecatungstophosphate/β zeolite catalysts in the ethylene production",
volume = "75",
pages = "3169-3180",
doi = "10.1007/s11696-021-01557-3"
}

Janićijević, D., Uskoković-Marković, S., Popa, A., Nedić-Vasiljević, B., Jevremović, A., Milojević-Rakić, M.,& Bajuk-Bogdanović, D.. (2021). The impact of preparation route on the performance of silver dodecatungstophosphate/β zeolite catalysts in the ethylene production. in Chemical Papers
Springer Science and Business Media Deutschland GmbH., 75, 3169-3180.
https://doi.org/10.1007/s11696-021-01557-3

Janićijević D, Uskoković-Marković S, Popa A, Nedić-Vasiljević B, Jevremović A, Milojević-Rakić M, Bajuk-Bogdanović D. The impact of preparation route on the performance of silver dodecatungstophosphate/β zeolite catalysts in the ethylene production. in Chemical Papers. 2021;75:3169-3180.
doi:10.1007/s11696-021-01557-3 .

Janićijević, Dejana, Uskoković-Marković, Snežana, Popa, Alexandru, Nedić-Vasiljević, Bojana, Jevremović, Anka, Milojević-Rakić, Maja, Bajuk-Bogdanović, Danica, "The impact of preparation route on the performance of silver dodecatungstophosphate/β zeolite catalysts in the ethylene production" in Chemical Papers, 75 (2021):3169-3180,
https://doi.org/10.1007/s11696-021-01557-3 . .

TY  - JOUR
AU  - Jevremović, Anka
AU  - Nedić-Vasiljević, Bojana
AU  - Popa, Alexandru
AU  - Uskoković-Marković, Snežana
AU  - Ignjatović, Ljubiša
AU  - Bajuk-Bogdanović, Danica
AU  - Milojević-Rakić, Maja
PY  - 2021
UR  - https://farfar.pharmacy.bg.ac.rs/handle/123456789/3783
AB  - Environmental implementation of novel composite materials comprising potassium tungstophosphate (KPW) and ZSM-5 zeolite was tested in ethene production and pesticide removal. The study revealed that the binding of KPW to ZSM-5 zeolites of different Si/Al ratios affects the formation of active centres for catalytic and adsorption processes. Brønsted active sites present in the zeolite framework are synergistically joined with Lewis centres and additional Brønsted centres through the impregnation of potassium tungstophosphate, which resulted in improvement of stability and activity of investigated materials. Adsorption and catalytic performance were found to be influenced by the order of addition of salt precursors and by post-synthesis thermal treatment. The best results found both in ethanol dehydration and nicosulfuron removal were for the same sample of KPW supported at zeolite ZSM-5 (SiO2/Al2O3 = 30). The prominent ethanol conversion of 98% and the highest and most stable selectivity toward ethene were evidenced, along with the capacity of 28.4 mg of targeted pesticide retained per gram of designed KPW/ZSM composite. This comprehensive investigation enabled insight into active site formations in the efficient KPW/ZSM composites. Different approaches to implementation revealed that a lower Si/Al ratio in zeolite promotes efficient K+ exchange, which combined with two-phased in situ preparation of KPW as active phase, evidently leads to the formation of isolated sites of superior activity for both catalytic and adsorptive procedures.
PB  - Elsevier B.V.
T2  - Microporous and Mesoporous Materials
T1  - The environmental impact of potassium tungstophosphate/ZSM-5 zeolite: Insight into catalysis and adsorption processes
VL  - 315
DO  - 10.1016/j.micromeso.2021.110925
ER  - 

@article{
author = "Jevremović, Anka and Nedić-Vasiljević, Bojana and Popa, Alexandru and Uskoković-Marković, Snežana and Ignjatović, Ljubiša and Bajuk-Bogdanović, Danica and Milojević-Rakić, Maja",
year = "2021",
abstract = "Environmental implementation of novel composite materials comprising potassium tungstophosphate (KPW) and ZSM-5 zeolite was tested in ethene production and pesticide removal. The study revealed that the binding of KPW to ZSM-5 zeolites of different Si/Al ratios affects the formation of active centres for catalytic and adsorption processes. Brønsted active sites present in the zeolite framework are synergistically joined with Lewis centres and additional Brønsted centres through the impregnation of potassium tungstophosphate, which resulted in improvement of stability and activity of investigated materials. Adsorption and catalytic performance were found to be influenced by the order of addition of salt precursors and by post-synthesis thermal treatment. The best results found both in ethanol dehydration and nicosulfuron removal were for the same sample of KPW supported at zeolite ZSM-5 (SiO2/Al2O3 = 30). The prominent ethanol conversion of 98% and the highest and most stable selectivity toward ethene were evidenced, along with the capacity of 28.4 mg of targeted pesticide retained per gram of designed KPW/ZSM composite. This comprehensive investigation enabled insight into active site formations in the efficient KPW/ZSM composites. Different approaches to implementation revealed that a lower Si/Al ratio in zeolite promotes efficient K+ exchange, which combined with two-phased in situ preparation of KPW as active phase, evidently leads to the formation of isolated sites of superior activity for both catalytic and adsorptive procedures.",
publisher = "Elsevier B.V.",
journal = "Microporous and Mesoporous Materials",
title = "The environmental impact of potassium tungstophosphate/ZSM-5 zeolite: Insight into catalysis and adsorption processes",
volume = "315",
doi = "10.1016/j.micromeso.2021.110925"
}

Jevremović, A., Nedić-Vasiljević, B., Popa, A., Uskoković-Marković, S., Ignjatović, L., Bajuk-Bogdanović, D.,& Milojević-Rakić, M.. (2021). The environmental impact of potassium tungstophosphate/ZSM-5 zeolite: Insight into catalysis and adsorption processes. in Microporous and Mesoporous Materials
Elsevier B.V.., 315.
https://doi.org/10.1016/j.micromeso.2021.110925

Jevremović A, Nedić-Vasiljević B, Popa A, Uskoković-Marković S, Ignjatović L, Bajuk-Bogdanović D, Milojević-Rakić M. The environmental impact of potassium tungstophosphate/ZSM-5 zeolite: Insight into catalysis and adsorption processes. in Microporous and Mesoporous Materials. 2021;315.
doi:10.1016/j.micromeso.2021.110925 .

Jevremović, Anka, Nedić-Vasiljević, Bojana, Popa, Alexandru, Uskoković-Marković, Snežana, Ignjatović, Ljubiša, Bajuk-Bogdanović, Danica, Milojević-Rakić, Maja, "The environmental impact of potassium tungstophosphate/ZSM-5 zeolite: Insight into catalysis and adsorption processes" in Microporous and Mesoporous Materials, 315 (2021),
https://doi.org/10.1016/j.micromeso.2021.110925 . .

TY  - JOUR
AU  - Popa, Alexandru
AU  - Borcanescu, Silvana
AU  - Holclajtner-Antunović, Ivanka
AU  - Bajuk-Bogdanović, Danica
AU  - Uskoković-Marković, Snežana
PY  - 2021
UR  - https://farfar.pharmacy.bg.ac.rs/handle/123456789/3726
AB  - In this study, the preparation of some large-pore ordered mesoporous silicas using a proper surfactant with different swelling agents was carried out. The synthesis of conventional SBA-15 was modified to obtain pore-expanded materials, with pore diameters up to 10 nm. To use a micelle swelling agent with a moderate swelling ability, three swelling agents were selected: 1-phenyl-decane (Dec), butyl benzene (BB), and mesitylene (Mes). These syntheses aimed to achieve a pore diameter enlargement but at the same time to avoid the formation of heterogeneous and/or poorly defined nanostructure of silica. The CO2 adsorbents were obtained by post-synthesis functionalization treatments carried out by grafting with 3-aminopropyl triethoxysilane. The CO2 adsorption/desorption experiments showed that carbon dioxide sorption capacities depend on the textural characteristics and the temperature used for the adsorption process. Good CO2 adsorption capacities were obtained for all prepared adsorbents, especially for SSBA-15-Mes-sil and SSBA-15-BB-sil samples. At 50 °C, the SSBA-15-Mes-sil sample has an adsorption capacity of 3.58 mmol CO2/g SiO2, and an efficiency of amino groups of 0.99 mmol CO2/mmol NH2. The results of adsorption capacities are comparable or even superior with the ones reported in literature for mesoporous silica functionalized with different amines. After nine adsorption–desorption cycles, the performance of the SSBA-15-Mes-sil adsorbent is relatively stable, with a low decrease in the adsorption capacity (0.1 mmol/g of CO2, i.e., 2.8% of initial capacity). These studies show the potential of mesoporous silica for carbon dioxide capture.
PB  - Springer Nature
T2  - Journal of Porous Materials
T1  - Preparation and characterisation of amino-functionalized pore-expanded mesoporous silica for carbon dioxide capture
VL  - 28
SP  - 143
EP  - 156
DO  - 10.1007/s10934-020-00974-1
ER  - 

@article{
author = "Popa, Alexandru and Borcanescu, Silvana and Holclajtner-Antunović, Ivanka and Bajuk-Bogdanović, Danica and Uskoković-Marković, Snežana",
year = "2021",
abstract = "In this study, the preparation of some large-pore ordered mesoporous silicas using a proper surfactant with different swelling agents was carried out. The synthesis of conventional SBA-15 was modified to obtain pore-expanded materials, with pore diameters up to 10 nm. To use a micelle swelling agent with a moderate swelling ability, three swelling agents were selected: 1-phenyl-decane (Dec), butyl benzene (BB), and mesitylene (Mes). These syntheses aimed to achieve a pore diameter enlargement but at the same time to avoid the formation of heterogeneous and/or poorly defined nanostructure of silica. The CO2 adsorbents were obtained by post-synthesis functionalization treatments carried out by grafting with 3-aminopropyl triethoxysilane. The CO2 adsorption/desorption experiments showed that carbon dioxide sorption capacities depend on the textural characteristics and the temperature used for the adsorption process. Good CO2 adsorption capacities were obtained for all prepared adsorbents, especially for SSBA-15-Mes-sil and SSBA-15-BB-sil samples. At 50 °C, the SSBA-15-Mes-sil sample has an adsorption capacity of 3.58 mmol CO2/g SiO2, and an efficiency of amino groups of 0.99 mmol CO2/mmol NH2. The results of adsorption capacities are comparable or even superior with the ones reported in literature for mesoporous silica functionalized with different amines. After nine adsorption–desorption cycles, the performance of the SSBA-15-Mes-sil adsorbent is relatively stable, with a low decrease in the adsorption capacity (0.1 mmol/g of CO2, i.e., 2.8% of initial capacity). These studies show the potential of mesoporous silica for carbon dioxide capture.",
publisher = "Springer Nature",
journal = "Journal of Porous Materials",
title = "Preparation and characterisation of amino-functionalized pore-expanded mesoporous silica for carbon dioxide capture",
volume = "28",
pages = "143-156",
doi = "10.1007/s10934-020-00974-1"
}

Popa, A., Borcanescu, S., Holclajtner-Antunović, I., Bajuk-Bogdanović, D.,& Uskoković-Marković, S.. (2021). Preparation and characterisation of amino-functionalized pore-expanded mesoporous silica for carbon dioxide capture. in Journal of Porous Materials
Springer Nature., 28, 143-156.
https://doi.org/10.1007/s10934-020-00974-1

Popa A, Borcanescu S, Holclajtner-Antunović I, Bajuk-Bogdanović D, Uskoković-Marković S. Preparation and characterisation of amino-functionalized pore-expanded mesoporous silica for carbon dioxide capture. in Journal of Porous Materials. 2021;28:143-156.
doi:10.1007/s10934-020-00974-1 .

Popa, Alexandru, Borcanescu, Silvana, Holclajtner-Antunović, Ivanka, Bajuk-Bogdanović, Danica, Uskoković-Marković, Snežana, "Preparation and characterisation of amino-functionalized pore-expanded mesoporous silica for carbon dioxide capture" in Journal of Porous Materials, 28 (2021):143-156,
https://doi.org/10.1007/s10934-020-00974-1 . .

TY  - JOUR
AU  - Uskoković-Marković, Snežana
AU  - Milenković, Marina
AU  - Pavun, Leposava
PY  - 2020
UR  - https://farfar.pharmacy.bg.ac.rs/handle/123456789/5061
AB  - A B S T R A C T
Flavonoids are a group of polyphenolic compounds widely present in the herbal world and playing an important role in the
human diet. The flavanol quercetin makes up 70% of the total daily intake of flavonoids. Quercetin is able to complex with many
metal ions, and it exhibits potent antioxidative ability. Using the equimolar solution variation method, it was confirmed that
quercetin makes a complex with the zinc(II) ion at pH 5.25, in a stoichiometric ratio quercetin:zinc(II) ion = 2:1, with the
absorption maximum λ=363 nm. This fact was used to develop a simple, precise and accurate assay to determine the content of
quercetin in various samples of heterogeneous composition. The proposed indirect spectrophotometric method can selectively
determine quercetin in concentrations ranging from 0.1 to 6.0 mgL-1, with LOD and LOQ estimated as 0.03 mgL-1 and 0.1 mgL-1,
respectively. The reliability of the proposed method was confirmed by a previously developed RP-HPLC/UV method. The
proposed method was successfully used to determine the quercetin content in dietary supplement tablets, capsules and two
onion extracts, with high reproducibility. The antioxidative ability of quercetin and the zinc(II)-quercetin complex was
determined using DPPH and FRAP methods. The same samples were tested for antimicrobial activity against seven laboratory
control strains of bacteria and one strain of yeast. As a result of those tests, there are no obstacles to combine quercetin and zinc
in the same supplement formulation..
AB  - И З В О Д
Флавоноиди су група полифенолних једињења широко распрострањена у биљном свету, која има значајну улогу у
људској исхрани. Флаванол кверцетин представља око 70% укупног дневног уноса флавоноида. Кверцетин гради
комплексе са бројним металним јонима и поседује значајну антиоксидативну способност. Применом методе варијација
еквимоларних односа, утврђено је да кверцетин гради комплекс са цинк (II) јоном на pH = 5,25, у стехиометријском
односу кверцетин : цинк(II)-јон = 2:1, са апсорпционим максимумом λmax=363 nm. Ова чињеница је искоришћена за
развијање једноставне, прецизне и тачне методе за одређивање кверцетина у различитим узорцима хетерогеног
састава. Предложеним индиректним спектрофотометријским поступком може се селективно одредити кверцетин у
концентрационом опсегу од 0,1 до 6,0 mg L-1, при чему је LOD = 0,03 mg L-1 a LOQ = 0,1 mgL-1. Поузданост предложеног
поступка потврђена је претходно развијеном RP-HPLC / UV методом за метанолне растворе кверцетина и капсула.
Предложена спектрофотометријска метода је успешно примењена за одређивање садржаја кверцетина у дијететским
суплементима, као и у два екстракта лука. Антиоксидативна способност кверцетина и комплекса цинк (II) - кверцетина
одређена је помоћу DPPH и FRAP метода. Такође је испитано антимикробно деловање кверцетина и одговарајућег
комплекса цинка на седам лабораторијских сојева бактерија и један сој квасца. Као резултат ових тестова, нема препрека
да се кверцетин и цинк комбинују у истој дијететској формулацији.
PB  - Faculty of Agronomy Čačak
T2  - Acta Agriculturae Serbica
T1  - Zinc-quercetin complex – from determination to bioactivity
VL  - 25
IS  - 50
SP  - 113
EP  - 120
DO  - 10.5937/AASer2050113U
ER  - 

@article{
author = "Uskoković-Marković, Snežana and Milenković, Marina and Pavun, Leposava",
year = "2020",
abstract = "A B S T R A C T
Flavonoids are a group of polyphenolic compounds widely present in the herbal world and playing an important role in the
human diet. The flavanol quercetin makes up 70% of the total daily intake of flavonoids. Quercetin is able to complex with many
metal ions, and it exhibits potent antioxidative ability. Using the equimolar solution variation method, it was confirmed that
quercetin makes a complex with the zinc(II) ion at pH 5.25, in a stoichiometric ratio quercetin:zinc(II) ion = 2:1, with the
absorption maximum λ=363 nm. This fact was used to develop a simple, precise and accurate assay to determine the content of
quercetin in various samples of heterogeneous composition. The proposed indirect spectrophotometric method can selectively
determine quercetin in concentrations ranging from 0.1 to 6.0 mgL-1, with LOD and LOQ estimated as 0.03 mgL-1 and 0.1 mgL-1,
respectively. The reliability of the proposed method was confirmed by a previously developed RP-HPLC/UV method. The
proposed method was successfully used to determine the quercetin content in dietary supplement tablets, capsules and two
onion extracts, with high reproducibility. The antioxidative ability of quercetin and the zinc(II)-quercetin complex was
determined using DPPH and FRAP methods. The same samples were tested for antimicrobial activity against seven laboratory
control strains of bacteria and one strain of yeast. As a result of those tests, there are no obstacles to combine quercetin and zinc
in the same supplement formulation.., И З В О Д
Флавоноиди су група полифенолних једињења широко распрострањена у биљном свету, која има значајну улогу у
људској исхрани. Флаванол кверцетин представља око 70% укупног дневног уноса флавоноида. Кверцетин гради
комплексе са бројним металним јонима и поседује значајну антиоксидативну способност. Применом методе варијација
еквимоларних односа, утврђено је да кверцетин гради комплекс са цинк (II) јоном на pH = 5,25, у стехиометријском
односу кверцетин : цинк(II)-јон = 2:1, са апсорпционим максимумом λmax=363 nm. Ова чињеница је искоришћена за
развијање једноставне, прецизне и тачне методе за одређивање кверцетина у различитим узорцима хетерогеног
састава. Предложеним индиректним спектрофотометријским поступком може се селективно одредити кверцетин у
концентрационом опсегу од 0,1 до 6,0 mg L-1, при чему је LOD = 0,03 mg L-1 a LOQ = 0,1 mgL-1. Поузданост предложеног
поступка потврђена је претходно развијеном RP-HPLC / UV методом за метанолне растворе кверцетина и капсула.
Предложена спектрофотометријска метода је успешно примењена за одређивање садржаја кверцетина у дијететским
суплементима, као и у два екстракта лука. Антиоксидативна способност кверцетина и комплекса цинк (II) - кверцетина
одређена је помоћу DPPH и FRAP метода. Такође је испитано антимикробно деловање кверцетина и одговарајућег
комплекса цинка на седам лабораторијских сојева бактерија и један сој квасца. Као резултат ових тестова, нема препрека
да се кверцетин и цинк комбинују у истој дијететској формулацији.",
publisher = "Faculty of Agronomy Čačak",
journal = "Acta Agriculturae Serbica",
title = "Zinc-quercetin complex – from determination to bioactivity",
volume = "25",
number = "50",
pages = "113-120",
doi = "10.5937/AASer2050113U"
}

Uskoković-Marković, S., Milenković, M.,& Pavun, L.. (2020). Zinc-quercetin complex – from determination to bioactivity. in Acta Agriculturae Serbica
Faculty of Agronomy Čačak., 25(50), 113-120.
https://doi.org/10.5937/AASer2050113U

Uskoković-Marković S, Milenković M, Pavun L. Zinc-quercetin complex – from determination to bioactivity. in Acta Agriculturae Serbica. 2020;25(50):113-120.
doi:10.5937/AASer2050113U .

Uskoković-Marković, Snežana, Milenković, Marina, Pavun, Leposava, "Zinc-quercetin complex – from determination to bioactivity" in Acta Agriculturae Serbica, 25, no. 50 (2020):113-120,
https://doi.org/10.5937/AASer2050113U . .

TY  - JOUR
AU  - Janićijević, Dejana
AU  - Uskoković-Marković, Snežana
AU  - Ranković, Dragan
AU  - Milenković, Marina
AU  - Jevremović, Anka
AU  - Nedić-Vasiljević, Bojana
AU  - Milojević-Rakić, Maja
AU  - Bajuk-Bogdanović, Danica
PY  - 2020
UR  - https://farfar.pharmacy.bg.ac.rs/handle/123456789/3587
AB  - Novel composites of BEA zeolite and silver tungstophosphate were prepared by different procedures: two-step impregnation, ion-exchange, and as physical mixtures with varying component mass ratios. Composites were characterized using Atomic force microscopy, Infrared, Raman and Atomic absorption spectroscopy, and results were related to adsorption properties and antimicrobial efficiencies of the composites. Prepared samples were tested as antimicrobial agents for fungal and different bacterial strains, as well as for adsorbents for pesticide nicosulfuron in aqueous solutions by using High-performance liquid chromatography. Experimental conditions for batch adsorption testing were optimized in order to efficiently eliminate nicosulfuron from aqueous solutions, while enabling antimicrobial activity of these advanced materials. Antimicrobial efficiency of composites was verified, and indicated that silver ion persistence in the solid phase is of utmost significance for the antimicrobial activity. Spectroscopic investigation revealed interaction of the silver tungstophosphate active phase and the zeolite framework, giving evidence of uniform distribution of active sites in the synthesized materials that proved to be essential for adsorption application. The best obtained adsorption capacity, as well as highest antimicrobial efficiency, is found for composite samples prepared by two-step impregnation with (BEA: silver tungstophosphate) mass ratio 2:1. The amount of nicosulfuron removed from water suspension was 38.2 mg per gram of composite, and the minimum inhibitory concentration determined for all investigated gram-negative bacteria was 125 μg mL−1.
PB  - Elsevier
T2  - Science of the Total Environment
T1  - Double active BEA zeolite/silver tungstophosphates – Antimicrobial effects and pesticide removal
VL  - 735
DO  - 10.1016/j.scitotenv.2020.139530
ER  - 

@article{
author = "Janićijević, Dejana and Uskoković-Marković, Snežana and Ranković, Dragan and Milenković, Marina and Jevremović, Anka and Nedić-Vasiljević, Bojana and Milojević-Rakić, Maja and Bajuk-Bogdanović, Danica",
year = "2020",
abstract = "Novel composites of BEA zeolite and silver tungstophosphate were prepared by different procedures: two-step impregnation, ion-exchange, and as physical mixtures with varying component mass ratios. Composites were characterized using Atomic force microscopy, Infrared, Raman and Atomic absorption spectroscopy, and results were related to adsorption properties and antimicrobial efficiencies of the composites. Prepared samples were tested as antimicrobial agents for fungal and different bacterial strains, as well as for adsorbents for pesticide nicosulfuron in aqueous solutions by using High-performance liquid chromatography. Experimental conditions for batch adsorption testing were optimized in order to efficiently eliminate nicosulfuron from aqueous solutions, while enabling antimicrobial activity of these advanced materials. Antimicrobial efficiency of composites was verified, and indicated that silver ion persistence in the solid phase is of utmost significance for the antimicrobial activity. Spectroscopic investigation revealed interaction of the silver tungstophosphate active phase and the zeolite framework, giving evidence of uniform distribution of active sites in the synthesized materials that proved to be essential for adsorption application. The best obtained adsorption capacity, as well as highest antimicrobial efficiency, is found for composite samples prepared by two-step impregnation with (BEA: silver tungstophosphate) mass ratio 2:1. The amount of nicosulfuron removed from water suspension was 38.2 mg per gram of composite, and the minimum inhibitory concentration determined for all investigated gram-negative bacteria was 125 μg mL−1.",
publisher = "Elsevier",
journal = "Science of the Total Environment",
title = "Double active BEA zeolite/silver tungstophosphates – Antimicrobial effects and pesticide removal",
volume = "735",
doi = "10.1016/j.scitotenv.2020.139530"
}

Janićijević, D., Uskoković-Marković, S., Ranković, D., Milenković, M., Jevremović, A., Nedić-Vasiljević, B., Milojević-Rakić, M.,& Bajuk-Bogdanović, D.. (2020). Double active BEA zeolite/silver tungstophosphates – Antimicrobial effects and pesticide removal. in Science of the Total Environment
Elsevier., 735.
https://doi.org/10.1016/j.scitotenv.2020.139530

Janićijević D, Uskoković-Marković S, Ranković D, Milenković M, Jevremović A, Nedić-Vasiljević B, Milojević-Rakić M, Bajuk-Bogdanović D. Double active BEA zeolite/silver tungstophosphates – Antimicrobial effects and pesticide removal. in Science of the Total Environment. 2020;735.
doi:10.1016/j.scitotenv.2020.139530 .

Janićijević, Dejana, Uskoković-Marković, Snežana, Ranković, Dragan, Milenković, Marina, Jevremović, Anka, Nedić-Vasiljević, Bojana, Milojević-Rakić, Maja, Bajuk-Bogdanović, Danica, "Double active BEA zeolite/silver tungstophosphates – Antimicrobial effects and pesticide removal" in Science of the Total Environment, 735 (2020),
https://doi.org/10.1016/j.scitotenv.2020.139530 . .

TY  - JOUR
AU  - Jovanović, Zoran
AU  - Mravik, Željko
AU  - Bajuk-Bogdanović, Danica
AU  - Jovanović, Sonja
AU  - Marković, S.
AU  - Vujković, Milica
AU  - Kovač, Janez
AU  - Vengust, Damjan
AU  - Uskoković-Marković, Snežana
AU  - Holclajtner-Antunović, Ivanka
PY  - 2020
UR  - https://farfar.pharmacy.bg.ac.rs/handle/123456789/3452
AB  - In the present study we investigated the interaction between 12-tungstophosphoric acid (WPA) and graphene oxide (GO) in their nanocomposite by utilizing the loading of WPA as an intrinsic parameter for interaction tuning. The Fourier-transform infrared spectroscopy, temperature-programmed desorption, X-ray photoelectron spectroscopy, zeta-potential measurements, thermogravimetric analysis, X-ray diffraction, Raman spectroscopy and transmission electron microscopy methods revealed that ∼5–13 wt% of WPA represents critical loading that separates two distinct contributions to GO-WPA interaction. This was explained by the self-limiting nature of GO-WPA interaction, initially controlled by high dispersion of WPA on GO (up to 13 wt%), that is eventually overpowered by WPA-WPA interaction as loading increases. As a result, the WPA agglomerates are being formed because of which the hybrid character of the nanocomposite diminishes, i.e., the properties of independent components start to be manifested to greater extent. The obtained results provide an important framework for considering possible outcomes in other 2D-0D systems, whose interaction is relevant both from fundamental and applicative point of view. Thus, the GO/WPA nanocomposite illustrates how the interactions between the components can be used for tuning the properties of nanocomposite as a whole.
PB  - Elsevier
T2  - Carbon
T1  - Self-limiting interactions in 2D–0D system: A case study of graphene oxide and 12-tungstophosphoric acid nanocomposite
VL  - 156
SP  - 166
EP  - 178
DO  - 10.1016/j.carbon.2019.09.072
ER  - 

@article{
author = "Jovanović, Zoran and Mravik, Željko and Bajuk-Bogdanović, Danica and Jovanović, Sonja and Marković, S. and Vujković, Milica and Kovač, Janez and Vengust, Damjan and Uskoković-Marković, Snežana and Holclajtner-Antunović, Ivanka",
year = "2020",
abstract = "In the present study we investigated the interaction between 12-tungstophosphoric acid (WPA) and graphene oxide (GO) in their nanocomposite by utilizing the loading of WPA as an intrinsic parameter for interaction tuning. The Fourier-transform infrared spectroscopy, temperature-programmed desorption, X-ray photoelectron spectroscopy, zeta-potential measurements, thermogravimetric analysis, X-ray diffraction, Raman spectroscopy and transmission electron microscopy methods revealed that ∼5–13 wt% of WPA represents critical loading that separates two distinct contributions to GO-WPA interaction. This was explained by the self-limiting nature of GO-WPA interaction, initially controlled by high dispersion of WPA on GO (up to 13 wt%), that is eventually overpowered by WPA-WPA interaction as loading increases. As a result, the WPA agglomerates are being formed because of which the hybrid character of the nanocomposite diminishes, i.e., the properties of independent components start to be manifested to greater extent. The obtained results provide an important framework for considering possible outcomes in other 2D-0D systems, whose interaction is relevant both from fundamental and applicative point of view. Thus, the GO/WPA nanocomposite illustrates how the interactions between the components can be used for tuning the properties of nanocomposite as a whole.",
publisher = "Elsevier",
journal = "Carbon",
title = "Self-limiting interactions in 2D–0D system: A case study of graphene oxide and 12-tungstophosphoric acid nanocomposite",
volume = "156",
pages = "166-178",
doi = "10.1016/j.carbon.2019.09.072"
}

Jovanović, Z., Mravik, Ž., Bajuk-Bogdanović, D., Jovanović, S., Marković, S., Vujković, M., Kovač, J., Vengust, D., Uskoković-Marković, S.,& Holclajtner-Antunović, I.. (2020). Self-limiting interactions in 2D–0D system: A case study of graphene oxide and 12-tungstophosphoric acid nanocomposite. in Carbon
Elsevier., 156, 166-178.
https://doi.org/10.1016/j.carbon.2019.09.072

Jovanović Z, Mravik Ž, Bajuk-Bogdanović D, Jovanović S, Marković S, Vujković M, Kovač J, Vengust D, Uskoković-Marković S, Holclajtner-Antunović I. Self-limiting interactions in 2D–0D system: A case study of graphene oxide and 12-tungstophosphoric acid nanocomposite. in Carbon. 2020;156:166-178.
doi:10.1016/j.carbon.2019.09.072 .

Jovanović, Zoran, Mravik, Željko, Bajuk-Bogdanović, Danica, Jovanović, Sonja, Marković, S., Vujković, Milica, Kovač, Janez, Vengust, Damjan, Uskoković-Marković, Snežana, Holclajtner-Antunović, Ivanka, "Self-limiting interactions in 2D–0D system: A case study of graphene oxide and 12-tungstophosphoric acid nanocomposite" in Carbon, 156 (2020):166-178,
https://doi.org/10.1016/j.carbon.2019.09.072 . .

TY  - JOUR
AU  - Pavun, Leposava
AU  - Uskoković-Marković, Snežana
PY  - 2019
UR  - https://farfar.pharmacy.bg.ac.rs/handle/123456789/5062
AB  - Hesperidin is the flavonoid heteroside most found in citrus species, such
as grapefruit, lemon and orange. It is applied in the treatment of numerous
cardiovascular diseases, with many products containing hesperidin in
combination with other flavonoid heterosides or vitamin C. The aim of this
study was to develop and validate a simple, rapid and sensitive and lowcost
method for determination of hesperidin in tablets and orange juices.
The developed spectrophotometric method is based on the formation of
the Zn(II)-hesperidin complex in 70 v/v% methanol at pH 3.12, with max of
absorption at λmax= 283 nm. The method of variation of equimolar solutions
confirmed the stoichiometry of the complex as hesperidin: zinc= 2:1.
The stability constant of the complex was obtained by the Bjerrum method
and it is logβ2 = 17.01 at pH 3.12. Linearity range for the developed method
was defined as 0.61-7.32 μg/mL, (confirmed by coefficient of determination,
r2 = 0.9882), while limits of detection and quantification were calculated
as LOD = 0.15 μg/mL and LOQ = 0.45 μg/mL. Fairly high precision of the
method is indicated by low values of CV, varying in the range 0.26-1.23%.
The proposed method fulfills all aimed requirements, and it was successfully
applied for determination of hesperidin in tablets with recovery value 92.2
% and commercially available orange juices.
AB  - Hesperidin je flavonoidni heterozid koji se najčešće nalazi u citrusnim vr-
stama, kao što su grejpfrut, limun i pomorandža. Primenjuje se u lečenju
brojnih kardiovaskularnih bolesti, sa mnogim proizvodima koji sadrže hes-
peridin u kombinaciji sa drugim flavonoidnim heterozidima ili vitaminom
C. Cilj ove studije je razvijanje i primena jednostavne, brze i osetljive, a pri
tome pristupačne metode za određivanje hesperidina u tabletama i sokovi-
ma od pomorandže. Razvijena spektrofotometrijska metoda zasniva se na
formiranju Zn(II)-hesperidin kompleksa u 70 v/v% metanolu pri pH 3,12, sa
maksimumom absorbancije na λ max= 283 nm. Metodom varijacije ekvimo-
larnih rastvora utvrđena je stehiometrija kompleksa hesperidin: cink = 2:1.
Konstanta stabilnosti kompleksa dobijena Bjerumovom metodom iznosi
logβ2 = 17,01 pri pH 3,12. Linearnost razvijene metode utvrđena je u oblasti
0,61 - 7,32 μg/mL, (potvrđeno koeficijentom određivanja, r2 = 0,9882), dok
su izračunati limiti detekcije i kvantifikacije LOD = 0,15 μg/mL i LOQ = 0,45
μg/mL. Na visoku preciznost metode ukazuju niske vrednosti koeficijenata
varijacije (CV je u oblasti 0,26 – 1,23 %). Predložena metoda ispunjava sve
postavljene zahteve i sa uspehom je primenjena za određivanje hesperidina
u tabletama uz recovery vrednost 92,2 % i komercijalno dostupnim sokovi-
ma od pomorandže.
PB  - Društvo za ishranu Srbije, Beograd
T2  - Hrana i ishrana
T1  - Spectrophotometric determination of hesperidin in supplements and orange juices
T1  - Spektrofotometrijsko određivanje hesperidina u suplementima i
sokovima od pomorandže
VL  - 60
IS  - 1
SP  - 18
EP  - 23
DO  - 10.5937/HraIsh1901018P
ER  - 

@article{
author = "Pavun, Leposava and Uskoković-Marković, Snežana",
year = "2019",
abstract = "Hesperidin is the flavonoid heteroside most found in citrus species, such
as grapefruit, lemon and orange. It is applied in the treatment of numerous
cardiovascular diseases, with many products containing hesperidin in
combination with other flavonoid heterosides or vitamin C. The aim of this
study was to develop and validate a simple, rapid and sensitive and lowcost
method for determination of hesperidin in tablets and orange juices.
The developed spectrophotometric method is based on the formation of
the Zn(II)-hesperidin complex in 70 v/v% methanol at pH 3.12, with max of
absorption at λmax= 283 nm. The method of variation of equimolar solutions
confirmed the stoichiometry of the complex as hesperidin: zinc= 2:1.
The stability constant of the complex was obtained by the Bjerrum method
and it is logβ2 = 17.01 at pH 3.12. Linearity range for the developed method
was defined as 0.61-7.32 μg/mL, (confirmed by coefficient of determination,
r2 = 0.9882), while limits of detection and quantification were calculated
as LOD = 0.15 μg/mL and LOQ = 0.45 μg/mL. Fairly high precision of the
method is indicated by low values of CV, varying in the range 0.26-1.23%.
The proposed method fulfills all aimed requirements, and it was successfully
applied for determination of hesperidin in tablets with recovery value 92.2
% and commercially available orange juices., Hesperidin je flavonoidni heterozid koji se najčešće nalazi u citrusnim vr-
stama, kao što su grejpfrut, limun i pomorandža. Primenjuje se u lečenju
brojnih kardiovaskularnih bolesti, sa mnogim proizvodima koji sadrže hes-
peridin u kombinaciji sa drugim flavonoidnim heterozidima ili vitaminom
C. Cilj ove studije je razvijanje i primena jednostavne, brze i osetljive, a pri
tome pristupačne metode za određivanje hesperidina u tabletama i sokovi-
ma od pomorandže. Razvijena spektrofotometrijska metoda zasniva se na
formiranju Zn(II)-hesperidin kompleksa u 70 v/v% metanolu pri pH 3,12, sa
maksimumom absorbancije na λ max= 283 nm. Metodom varijacije ekvimo-
larnih rastvora utvrđena je stehiometrija kompleksa hesperidin: cink = 2:1.
Konstanta stabilnosti kompleksa dobijena Bjerumovom metodom iznosi
logβ2 = 17,01 pri pH 3,12. Linearnost razvijene metode utvrđena je u oblasti
0,61 - 7,32 μg/mL, (potvrđeno koeficijentom određivanja, r2 = 0,9882), dok
su izračunati limiti detekcije i kvantifikacije LOD = 0,15 μg/mL i LOQ = 0,45
μg/mL. Na visoku preciznost metode ukazuju niske vrednosti koeficijenata
varijacije (CV je u oblasti 0,26 – 1,23 %). Predložena metoda ispunjava sve
postavljene zahteve i sa uspehom je primenjena za određivanje hesperidina
u tabletama uz recovery vrednost 92,2 % i komercijalno dostupnim sokovi-
ma od pomorandže.",
publisher = "Društvo za ishranu Srbije, Beograd",
journal = "Hrana i ishrana",
title = "Spectrophotometric determination of hesperidin in supplements and orange juices, Spektrofotometrijsko određivanje hesperidina u suplementima i
sokovima od pomorandže",
volume = "60",
number = "1",
pages = "18-23",
doi = "10.5937/HraIsh1901018P"
}

Pavun, L.,& Uskoković-Marković, S.. (2019). Spectrophotometric determination of hesperidin in supplements and orange juices. in Hrana i ishrana
Društvo za ishranu Srbije, Beograd., 60(1), 18-23.
https://doi.org/10.5937/HraIsh1901018P

Pavun L, Uskoković-Marković S. Spectrophotometric determination of hesperidin in supplements and orange juices. in Hrana i ishrana. 2019;60(1):18-23.
doi:10.5937/HraIsh1901018P .

Pavun, Leposava, Uskoković-Marković, Snežana, "Spectrophotometric determination of hesperidin in supplements and orange juices" in Hrana i ishrana, 60, no. 1 (2019):18-23,
https://doi.org/10.5937/HraIsh1901018P . .

TY  - JOUR
AU  - Holclajtner-Antunović, Ivanka
AU  - Uskoković-Marković, Snežana
AU  - Popa, Alexandru
AU  - Jevremović, A
AU  - Nedić-Vasiljević, Bojana
AU  - Milojević-Rakić, Maja
AU  - Bajuk-Bogdanović, Danica
PY  - 2019
UR  - https://farfar.pharmacy.bg.ac.rs/handle/123456789/3280
AB  - The current study reports the synthesis, characterization and catalytic activity of tungstophosphoric acid (HPW) and its potassium salts (KH2PW and K3PW) supported on activated carbon (AC). Because potassium salts of tungstophosphoric acid are insoluble, the carbon supported KH2PW and K3PW were prepared by a two step impregnation method. The synthesized catalysts were characterized by various physicochemical methods such as Fourier transform infrared and Raman spectroscopy, differential thermal analysis, thermogravimetric analysis, X-ray diffraction, scanning electron microscopy and nitrogen physisorption. It is observed that all active phases keep their Keggin-type structure after being supported on AC, while their specific surface area is considerably increased by deposition on this porous substrate. The results also indicated that the synthesized materials retained the morphology specific for the support as well as its thermal properties. The adsorption behaviour of the nanocomposites towards nicosulfuron pesticide was found to be particulary good and even slightly improved when compared to pure activated carbon. The catalytic activity of the prepared catalysts was probed for the vapor phase dehydration of ethanol at 300 °C. The conversion of ethanol and selectivity toward ethylene and diethyl ether of nanocomposites were compared with the values of bare HPW, KH2PW and K3PW. Results revealed that catalytic activity depends on the catalyst type and active phase loading. The conversion over unsupported catalysts decreased by increasing the cation content per Keggin unit. The nanocomposites with 30 wt% loading of HPW achieved the best conversion of nearly 100% and the highest and stable selectivity toward ethylene. The catalytic activity of nanocomposites with acidic KH2PW showed lower catalytic activity of about 70%, while the nanocomposites of neutral K3PW and AC showed negligible activity.
PB  - Springer Netherlands
T2  - Records of Natural Products
T1  - Ethanol dehydration over Keggin type tungstophosphoric acid and its potassium salts supported on carbon
DO  - 10.1007/s11144-019-01625-6
ER  - 

@article{
author = "Holclajtner-Antunović, Ivanka and Uskoković-Marković, Snežana and Popa, Alexandru and Jevremović, A and Nedić-Vasiljević, Bojana and Milojević-Rakić, Maja and Bajuk-Bogdanović, Danica",
year = "2019",
abstract = "The current study reports the synthesis, characterization and catalytic activity of tungstophosphoric acid (HPW) and its potassium salts (KH2PW and K3PW) supported on activated carbon (AC). Because potassium salts of tungstophosphoric acid are insoluble, the carbon supported KH2PW and K3PW were prepared by a two step impregnation method. The synthesized catalysts were characterized by various physicochemical methods such as Fourier transform infrared and Raman spectroscopy, differential thermal analysis, thermogravimetric analysis, X-ray diffraction, scanning electron microscopy and nitrogen physisorption. It is observed that all active phases keep their Keggin-type structure after being supported on AC, while their specific surface area is considerably increased by deposition on this porous substrate. The results also indicated that the synthesized materials retained the morphology specific for the support as well as its thermal properties. The adsorption behaviour of the nanocomposites towards nicosulfuron pesticide was found to be particulary good and even slightly improved when compared to pure activated carbon. The catalytic activity of the prepared catalysts was probed for the vapor phase dehydration of ethanol at 300 °C. The conversion of ethanol and selectivity toward ethylene and diethyl ether of nanocomposites were compared with the values of bare HPW, KH2PW and K3PW. Results revealed that catalytic activity depends on the catalyst type and active phase loading. The conversion over unsupported catalysts decreased by increasing the cation content per Keggin unit. The nanocomposites with 30 wt% loading of HPW achieved the best conversion of nearly 100% and the highest and stable selectivity toward ethylene. The catalytic activity of nanocomposites with acidic KH2PW showed lower catalytic activity of about 70%, while the nanocomposites of neutral K3PW and AC showed negligible activity.",
publisher = "Springer Netherlands",
journal = "Records of Natural Products",
title = "Ethanol dehydration over Keggin type tungstophosphoric acid and its potassium salts supported on carbon",
doi = "10.1007/s11144-019-01625-6"
}

Holclajtner-Antunović, I., Uskoković-Marković, S., Popa, A., Jevremović, A., Nedić-Vasiljević, B., Milojević-Rakić, M.,& Bajuk-Bogdanović, D.. (2019). Ethanol dehydration over Keggin type tungstophosphoric acid and its potassium salts supported on carbon. in Records of Natural Products
Springer Netherlands..
https://doi.org/10.1007/s11144-019-01625-6

Holclajtner-Antunović I, Uskoković-Marković S, Popa A, Jevremović A, Nedić-Vasiljević B, Milojević-Rakić M, Bajuk-Bogdanović D. Ethanol dehydration over Keggin type tungstophosphoric acid and its potassium salts supported on carbon. in Records of Natural Products. 2019;.
doi:10.1007/s11144-019-01625-6 .

Holclajtner-Antunović, Ivanka, Uskoković-Marković, Snežana, Popa, Alexandru, Jevremović, A, Nedić-Vasiljević, Bojana, Milojević-Rakić, Maja, Bajuk-Bogdanović, Danica, "Ethanol dehydration over Keggin type tungstophosphoric acid and its potassium salts supported on carbon" in Records of Natural Products (2019),
https://doi.org/10.1007/s11144-019-01625-6 . .

TY  - JOUR
AU  - Bajuk-Bogdanovic, Danica
AU  - Holclajtner-Antunović, Ivanka
AU  - Jovanović, Zoran
AU  - Mravik, Željko
AU  - Krstić, Jugoslav
AU  - Uskoković-Marković, Snežana
AU  - Vujkovic, Milica
PY  - 2019
UR  - https://farfar.pharmacy.bg.ac.rs/handle/123456789/3455
AB  - The synergistic effects between two Keggin-type heteropoly acids (HPAs) and carbon surface were examined and elucidated. An improved high rate capability (and potential high capacitor electrode for supercapacitors) of the hybrid materials, obtained by anchoring of α-dodecamolybdophosphoric (MoPA), α-dodecatungstophosphoric (WPA), and their mixture to activated carbon (AC), was achieved through the different mechanism of interaction. In order to elaborate this, a detailed analysis of AC-HPA composites has been performed by scanning electron microscopy (SEM), Brunauer–Emmett–Teller (BET) analysis, temperature-programmed desorption (TPD), Fourier-transform infrared spectroscopy (FTIR), micro Raman spectroscopy, and zeta potential measurements. The zeta potential measurements revealed positive charge of carbon surface thus indicating attractive interactions with negatively charged Keggin anion. The surface analysis has shown that WPA spontaneously reduces the carbon surface, while interaction with MoPA leads to its oxidation. As the consequence of the tailoring of the functional groups at carbon surface through HPAs’ action, the distortion of cyclic voltammograms (CVs) decreased in the following order: AC-MoPA, AC-MoPA-WPA, and AC-WPA. A prominent rectangular shape of AC-WPA, even at an extremely high scan rate of 400 mVs−1, was measured, which is rarely demonstrated for carbon-based composites. By applying the theory of electrode potentials, the HPA-AC synergistic effect was explained and discussed in terms of charge storage improvement of HPA-modified carbon.
PB  - Springer
T2  - Journal of Solid State Electrochemistry
T1  - Tailoring the electrochemical charge storage properties of carbonaceous support by redox properties of heteropoly acids: where does the synergy come from?
VL  - 23
IS  - 9
SP  - 2747
EP  - 2758
DO  - 10.1007/s10008-019-04369-4
ER  - 

@article{
author = "Bajuk-Bogdanovic, Danica and Holclajtner-Antunović, Ivanka and Jovanović, Zoran and Mravik, Željko and Krstić, Jugoslav and Uskoković-Marković, Snežana and Vujkovic, Milica",
year = "2019",
abstract = "The synergistic effects between two Keggin-type heteropoly acids (HPAs) and carbon surface were examined and elucidated. An improved high rate capability (and potential high capacitor electrode for supercapacitors) of the hybrid materials, obtained by anchoring of α-dodecamolybdophosphoric (MoPA), α-dodecatungstophosphoric (WPA), and their mixture to activated carbon (AC), was achieved through the different mechanism of interaction. In order to elaborate this, a detailed analysis of AC-HPA composites has been performed by scanning electron microscopy (SEM), Brunauer–Emmett–Teller (BET) analysis, temperature-programmed desorption (TPD), Fourier-transform infrared spectroscopy (FTIR), micro Raman spectroscopy, and zeta potential measurements. The zeta potential measurements revealed positive charge of carbon surface thus indicating attractive interactions with negatively charged Keggin anion. The surface analysis has shown that WPA spontaneously reduces the carbon surface, while interaction with MoPA leads to its oxidation. As the consequence of the tailoring of the functional groups at carbon surface through HPAs’ action, the distortion of cyclic voltammograms (CVs) decreased in the following order: AC-MoPA, AC-MoPA-WPA, and AC-WPA. A prominent rectangular shape of AC-WPA, even at an extremely high scan rate of 400 mVs−1, was measured, which is rarely demonstrated for carbon-based composites. By applying the theory of electrode potentials, the HPA-AC synergistic effect was explained and discussed in terms of charge storage improvement of HPA-modified carbon.",
publisher = "Springer",
journal = "Journal of Solid State Electrochemistry",
title = "Tailoring the electrochemical charge storage properties of carbonaceous support by redox properties of heteropoly acids: where does the synergy come from?",
volume = "23",
number = "9",
pages = "2747-2758",
doi = "10.1007/s10008-019-04369-4"
}

Bajuk-Bogdanovic, D., Holclajtner-Antunović, I., Jovanović, Z., Mravik, Ž., Krstić, J., Uskoković-Marković, S.,& Vujkovic, M.. (2019). Tailoring the electrochemical charge storage properties of carbonaceous support by redox properties of heteropoly acids: where does the synergy come from?. in Journal of Solid State Electrochemistry
Springer., 23(9), 2747-2758.
https://doi.org/10.1007/s10008-019-04369-4

Bajuk-Bogdanovic D, Holclajtner-Antunović I, Jovanović Z, Mravik Ž, Krstić J, Uskoković-Marković S, Vujkovic M. Tailoring the electrochemical charge storage properties of carbonaceous support by redox properties of heteropoly acids: where does the synergy come from?. in Journal of Solid State Electrochemistry. 2019;23(9):2747-2758.
doi:10.1007/s10008-019-04369-4 .

Bajuk-Bogdanovic, Danica, Holclajtner-Antunović, Ivanka, Jovanović, Zoran, Mravik, Željko, Krstić, Jugoslav, Uskoković-Marković, Snežana, Vujkovic, Milica, "Tailoring the electrochemical charge storage properties of carbonaceous support by redox properties of heteropoly acids: where does the synergy come from?" in Journal of Solid State Electrochemistry, 23, no. 9 (2019):2747-2758,
https://doi.org/10.1007/s10008-019-04369-4 . .

TY  - CONF
AU  - Pavun, Leposava
AU  - Mićić, Svetlana
AU  - Janošević-Ležaić, Aleksandra
AU  - Kovačević, Katarina
AU  - Uskoković-Marković, Snežana
AU  - Pejić, Nataša
PY  - 2018
UR  - https://farfar.pharmacy.bg.ac.rs/handle/123456789/5218
AB  - ABSTRACT 
The current research provides the development of the new spectrophotometric 
method for the simple and affordable quercetin quantification. Proposed 
method based on formation of supramolecular assembles of quercetin (Q) and 
cetyl trimethylammonium bromide (CTAB). Under selected experimental 
conditions (l = 378 nm, cCTAB = 2 mM and T = 25 °C), Beer’s law was obeyed 
in the quercetin concentration ranged 2 ¥10-6 - 8¥10-5
 mol dm-3. The method 
sensitivity was 2.1 × 104
 dm2
 mol–1
 (the molar absorptivity) as well as 1¥10-6
mol dm-3 (the limit of detection). The method applicability to the direct Q 
determination in a pharmaceutical formulation (Quercetin+C capsules, 
Twinlab) was demonstrated.
PB  - Society of Physical Chemists of Serbia
C3  - PHYSICAL CHEMISTRY 2018 (Proceedings) 14th International Conference  on Fundamental and Applied Aspects of  Physical Chemistry
T1  - Spectrophotometric quantification of quercetine using a micelle system
VL  - II
SP  - 983
EP  - 986
UR  - https://hdl.handle.net/21.15107/rcub_farfar_5218
ER  - 

@conference{
author = "Pavun, Leposava and Mićić, Svetlana and Janošević-Ležaić, Aleksandra and Kovačević, Katarina and Uskoković-Marković, Snežana and Pejić, Nataša",
year = "2018",
abstract = "ABSTRACT 
The current research provides the development of the new spectrophotometric 
method for the simple and affordable quercetin quantification. Proposed 
method based on formation of supramolecular assembles of quercetin (Q) and 
cetyl trimethylammonium bromide (CTAB). Under selected experimental 
conditions (l = 378 nm, cCTAB = 2 mM and T = 25 °C), Beer’s law was obeyed 
in the quercetin concentration ranged 2 ¥10-6 - 8¥10-5
 mol dm-3. The method 
sensitivity was 2.1 × 104
 dm2
 mol–1
 (the molar absorptivity) as well as 1¥10-6
mol dm-3 (the limit of detection). The method applicability to the direct Q 
determination in a pharmaceutical formulation (Quercetin+C capsules, 
Twinlab) was demonstrated.",
publisher = "Society of Physical Chemists of Serbia",
journal = "PHYSICAL CHEMISTRY 2018 (Proceedings) 14th International Conference  on Fundamental and Applied Aspects of  Physical Chemistry",
title = "Spectrophotometric quantification of quercetine using a micelle system",
volume = "II",
pages = "983-986",
url = "https://hdl.handle.net/21.15107/rcub_farfar_5218"
}

Pavun, L., Mićić, S., Janošević-Ležaić, A., Kovačević, K., Uskoković-Marković, S.,& Pejić, N.. (2018). Spectrophotometric quantification of quercetine using a micelle system. in PHYSICAL CHEMISTRY 2018 (Proceedings) 14th International Conference  on Fundamental and Applied Aspects of  Physical Chemistry
Society of Physical Chemists of Serbia., II, 983-986.
https://hdl.handle.net/21.15107/rcub_farfar_5218

Pavun L, Mićić S, Janošević-Ležaić A, Kovačević K, Uskoković-Marković S, Pejić N. Spectrophotometric quantification of quercetine using a micelle system. in PHYSICAL CHEMISTRY 2018 (Proceedings) 14th International Conference  on Fundamental and Applied Aspects of  Physical Chemistry. 2018;II:983-986.
https://hdl.handle.net/21.15107/rcub_farfar_5218 .

Pavun, Leposava, Mićić, Svetlana, Janošević-Ležaić, Aleksandra, Kovačević, Katarina, Uskoković-Marković, Snežana, Pejić, Nataša, "Spectrophotometric quantification of quercetine using a micelle system" in PHYSICAL CHEMISTRY 2018 (Proceedings) 14th International Conference  on Fundamental and Applied Aspects of  Physical Chemistry, II (2018):983-986,
https://hdl.handle.net/21.15107/rcub_farfar_5218 .