TY  - JOUR
AU  - Janošević-Ležaić, Aleksandra
AU  - Bajuk-Bogdanović, Danica
AU  - Ćirić-Marjanović, Gordana
PY  - 2024
UR  - https://farfar.pharmacy.bg.ac.rs/handle/123456789/5612
AB  - In situ Raman spectroscopy was used for the first time to study the reaction intermediates/products of the
oxidative polymerization of aniline to polyaniline (PANI) with peroxydisulfate in aqueous solutions of different
initial acidity. Raman spectra were recorded for the drops of reaction mixture taken at various reaction times.
Five reaction systems with different pH of the monomer solution (pHmon), leading to 1-D nanostructured PANIs
(pHmon =5.8, 4.6 and 4.5) and granular PANIs (pHmon= 3.4 and 1.0) were explored. Spectral characteristics of
different reaction phases - athermal, exothermic and post-propagation were identified and correlated with the
proposed mechanisms of aniline polymerization and nanostructures formation. For the nanostructured PANIs,
the athermal phase was characterized by pronounced strengthening of the δ(N H)/ν(C––N)Q band at
1510–1520 cm 1, while the characteristic of the second exothermic phase was the strengthening of the ν(C~C)B/
ν(C~C)Phz band at c.a. 1636 cm 1 which becomes stronger than the ν(C––C)Q/ν(C~C)SQ band at c.a. 1590 cm–1.
For granular PANIs, the band at 1590 cm–1 was stronger than that at 1630 cm–1 for all reaction phases. For all
reaction systems, characteristic feature of the post-propagation phase was strengthening of the ν(C~N+•) band at
1330–1340 cm 1 due to delocalized polarons. For granular PANIs, the band associated with phenazine-like units
at c.a. 1415 cm 1 disappeared after the exothermic phase, while for nanostructured PANIs it was seen until the
end of the reaction. The obtained results are expected to be useful in further investigations of the intermediates/
products and mechanisms of polymerizations of other aromatic amines.
PB  - Elsevier
T2  - Synthetic Metals  Synthetic Metals
T1  - In situ Raman spectroscopy study of the oxidative polymerization of aniline in media of different acidity
VL  - 305
SP  - 117602
DO  - 10.1016/j.synthmet.2024.117602
ER  - 

@article{
author = "Janošević-Ležaić, Aleksandra and Bajuk-Bogdanović, Danica and Ćirić-Marjanović, Gordana",
year = "2024",
abstract = "In situ Raman spectroscopy was used for the first time to study the reaction intermediates/products of the
oxidative polymerization of aniline to polyaniline (PANI) with peroxydisulfate in aqueous solutions of different
initial acidity. Raman spectra were recorded for the drops of reaction mixture taken at various reaction times.
Five reaction systems with different pH of the monomer solution (pHmon), leading to 1-D nanostructured PANIs
(pHmon =5.8, 4.6 and 4.5) and granular PANIs (pHmon= 3.4 and 1.0) were explored. Spectral characteristics of
different reaction phases - athermal, exothermic and post-propagation were identified and correlated with the
proposed mechanisms of aniline polymerization and nanostructures formation. For the nanostructured PANIs,
the athermal phase was characterized by pronounced strengthening of the δ(N H)/ν(C––N)Q band at
1510–1520 cm 1, while the characteristic of the second exothermic phase was the strengthening of the ν(C~C)B/
ν(C~C)Phz band at c.a. 1636 cm 1 which becomes stronger than the ν(C––C)Q/ν(C~C)SQ band at c.a. 1590 cm–1.
For granular PANIs, the band at 1590 cm–1 was stronger than that at 1630 cm–1 for all reaction phases. For all
reaction systems, characteristic feature of the post-propagation phase was strengthening of the ν(C~N+•) band at
1330–1340 cm 1 due to delocalized polarons. For granular PANIs, the band associated with phenazine-like units
at c.a. 1415 cm 1 disappeared after the exothermic phase, while for nanostructured PANIs it was seen until the
end of the reaction. The obtained results are expected to be useful in further investigations of the intermediates/
products and mechanisms of polymerizations of other aromatic amines.",
publisher = "Elsevier",
journal = "Synthetic Metals  Synthetic Metals",
title = "In situ Raman spectroscopy study of the oxidative polymerization of aniline in media of different acidity",
volume = "305",
pages = "117602",
doi = "10.1016/j.synthmet.2024.117602"
}

Janošević-Ležaić, A., Bajuk-Bogdanović, D.,& Ćirić-Marjanović, G.. (2024). In situ Raman spectroscopy study of the oxidative polymerization of aniline in media of different acidity. in Synthetic Metals  Synthetic Metals
Elsevier., 305, 117602.
https://doi.org/10.1016/j.synthmet.2024.117602

Janošević-Ležaić A, Bajuk-Bogdanović D, Ćirić-Marjanović G. In situ Raman spectroscopy study of the oxidative polymerization of aniline in media of different acidity. in Synthetic Metals  Synthetic Metals. 2024;305:117602.
doi:10.1016/j.synthmet.2024.117602 .

Janošević-Ležaić, Aleksandra, Bajuk-Bogdanović, Danica, Ćirić-Marjanović, Gordana, "In situ Raman spectroscopy study of the oxidative polymerization of aniline in media of different acidity" in Synthetic Metals  Synthetic Metals, 305 (2024):117602,
https://doi.org/10.1016/j.synthmet.2024.117602 . .

TY  - JOUR
AU  - Popadić, Daliborka
AU  - Krstić, Jugoslav
AU  - Janošević-Ležaić, Aleksandra
AU  - Popović, Maja
AU  - Milojević-Rakić, Maja
AU  - Ignjatović, Ljubiša
AU  - Bajuk-Bogdanović, Danica
AU  - Gavrilov, Nemanja
PY  - 2024
UR  - https://farfar.pharmacy.bg.ac.rs/handle/123456789/5405
AB  - Reuse and/or recycling of spent adsorbents is taking a central role in modern thinking and catalyzed carbonization is the way forward. Herein we explore the carbonization of adsorbed acetamiprid, in an inert atmosphere, as a way of recycling and producing nitrogen-rich carbon material for potential use in supercapacitors. Added value material and the reuse of the adsorbent were achieved by carbonization at 700 °C under argon. The formation of a nitrogen-doped carbon layer as an active material on the adsorbent, bonded through a C-Si linkage, has been conclusively verified through elemental composition quantification using XPS and EDX measurements. Two-stage catalytic decomposition and condensation of the adsorbed pesticide is followed by TGA and TPD-MS. Attained carbon-based materials give stable Faradaic capacitance with a slight dependency on the number of adsorbing cycles. Capacitance calculated with respect to the adlayer carbon material reaches values as high as 610 F g−1. Galvanostatic Charge/Discharge measurement confirmed the stability of explored materials with a slight increase in capacitance over 1000 cycles. The presented results envisage electroactive materials preparation from environmental pollutants, adding value to spent adsorbents.
PB  - Elsevier B.V.
T2  - Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy
T1  - Acetamiprid's degradation products and mechanism: Part II – Inert atmosphere and charge storage
VL  - 308
DO  - 10.1016/j.saa.2023.123772
ER  - 

@article{
author = "Popadić, Daliborka and Krstić, Jugoslav and Janošević-Ležaić, Aleksandra and Popović, Maja and Milojević-Rakić, Maja and Ignjatović, Ljubiša and Bajuk-Bogdanović, Danica and Gavrilov, Nemanja",
year = "2024",
abstract = "Reuse and/or recycling of spent adsorbents is taking a central role in modern thinking and catalyzed carbonization is the way forward. Herein we explore the carbonization of adsorbed acetamiprid, in an inert atmosphere, as a way of recycling and producing nitrogen-rich carbon material for potential use in supercapacitors. Added value material and the reuse of the adsorbent were achieved by carbonization at 700 °C under argon. The formation of a nitrogen-doped carbon layer as an active material on the adsorbent, bonded through a C-Si linkage, has been conclusively verified through elemental composition quantification using XPS and EDX measurements. Two-stage catalytic decomposition and condensation of the adsorbed pesticide is followed by TGA and TPD-MS. Attained carbon-based materials give stable Faradaic capacitance with a slight dependency on the number of adsorbing cycles. Capacitance calculated with respect to the adlayer carbon material reaches values as high as 610 F g−1. Galvanostatic Charge/Discharge measurement confirmed the stability of explored materials with a slight increase in capacitance over 1000 cycles. The presented results envisage electroactive materials preparation from environmental pollutants, adding value to spent adsorbents.",
publisher = "Elsevier B.V.",
journal = "Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy",
title = "Acetamiprid's degradation products and mechanism: Part II – Inert atmosphere and charge storage",
volume = "308",
doi = "10.1016/j.saa.2023.123772"
}

Popadić, D., Krstić, J., Janošević-Ležaić, A., Popović, M., Milojević-Rakić, M., Ignjatović, L., Bajuk-Bogdanović, D.,& Gavrilov, N.. (2024). Acetamiprid's degradation products and mechanism: Part II – Inert atmosphere and charge storage. in Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy
Elsevier B.V.., 308.
https://doi.org/10.1016/j.saa.2023.123772

Popadić D, Krstić J, Janošević-Ležaić A, Popović M, Milojević-Rakić M, Ignjatović L, Bajuk-Bogdanović D, Gavrilov N. Acetamiprid's degradation products and mechanism: Part II – Inert atmosphere and charge storage. in Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy. 2024;308.
doi:10.1016/j.saa.2023.123772 .

Popadić, Daliborka, Krstić, Jugoslav, Janošević-Ležaić, Aleksandra, Popović, Maja, Milojević-Rakić, Maja, Ignjatović, Ljubiša, Bajuk-Bogdanović, Danica, Gavrilov, Nemanja, "Acetamiprid's degradation products and mechanism: Part II – Inert atmosphere and charge storage" in Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy, 308 (2024),
https://doi.org/10.1016/j.saa.2023.123772 . .

TY  - JOUR
AU  - Ranković, Maja
AU  - Jevremović, Anka
AU  - Janošević-Ležaić, Aleksandra
AU  - Arsenijević, Aleksandar
AU  - Rupar, Jelena
AU  - Dobričić, Vladimir
AU  - Nedić Vasiljević, Bojana
AU  - Gavrilov, Nemanja
AU  - Bajuk-Bogdanović, Danica
AU  - Milojević-Rakić, Maja
PY  - 2023
UR  - https://farfar.pharmacy.bg.ac.rs/handle/123456789/4649
AB  - Acridine and its derivatives (9-chloroacridine and 9-aminoacridine) are investigated here, supported on FAU type zeolite Y, as a delivery system of anticancer agents. FTIR/Raman spectroscopy and electron microscopy revealed successful drug loading on the zeolite surface, while spectrofluorimetry was employed for drug quantification. The effects of the tested compounds on cell viability were evaluated using in vitro methylthiazol-tetrazolium (MTT) colorimetric technique against human colorectal carcinoma (cell line HCT-116) and MRC-5 fibroblasts. Zeolite structure remained unchanged during homogeneous drug impregnation with achieved drug loadings in the 18–21 mg/g range. The highest drug release, in the µM concentration range, with favourable kinetics was established for zeolite-supported 9-aminoacridine. The acridine delivery via zeolite carrier is viewed in terms of solvation energy and zeolite adsorption sites. The cytotoxic effect of supported acridines on HCT-116 cells reveals that the zeolite carrier improves toxicity, while the highest efficiency is displayed by zeolite-impregnated 9-aminoacridine. The 9-aminoacridine delivery via zeolite carrier favours healthy tissue preservation while accompanying increased toxicity toward cancer cells. Cytotoxicity results are well correlated with theoretical modelling and release study, providing promising results for applicative purposes.
PB  - MDPI
T2  - Journal of Functional Biomaterials
T1  - Can Zeolite-Supporting Acridines Boost Their Anticancer Performance?
VL  - 14
IS  - 3
DO  - 10.3390/jfb14030173
ER  - 

@article{
author = "Ranković, Maja and Jevremović, Anka and Janošević-Ležaić, Aleksandra and Arsenijević, Aleksandar and Rupar, Jelena and Dobričić, Vladimir and Nedić Vasiljević, Bojana and Gavrilov, Nemanja and Bajuk-Bogdanović, Danica and Milojević-Rakić, Maja",
year = "2023",
abstract = "Acridine and its derivatives (9-chloroacridine and 9-aminoacridine) are investigated here, supported on FAU type zeolite Y, as a delivery system of anticancer agents. FTIR/Raman spectroscopy and electron microscopy revealed successful drug loading on the zeolite surface, while spectrofluorimetry was employed for drug quantification. The effects of the tested compounds on cell viability were evaluated using in vitro methylthiazol-tetrazolium (MTT) colorimetric technique against human colorectal carcinoma (cell line HCT-116) and MRC-5 fibroblasts. Zeolite structure remained unchanged during homogeneous drug impregnation with achieved drug loadings in the 18–21 mg/g range. The highest drug release, in the µM concentration range, with favourable kinetics was established for zeolite-supported 9-aminoacridine. The acridine delivery via zeolite carrier is viewed in terms of solvation energy and zeolite adsorption sites. The cytotoxic effect of supported acridines on HCT-116 cells reveals that the zeolite carrier improves toxicity, while the highest efficiency is displayed by zeolite-impregnated 9-aminoacridine. The 9-aminoacridine delivery via zeolite carrier favours healthy tissue preservation while accompanying increased toxicity toward cancer cells. Cytotoxicity results are well correlated with theoretical modelling and release study, providing promising results for applicative purposes.",
publisher = "MDPI",
journal = "Journal of Functional Biomaterials",
title = "Can Zeolite-Supporting Acridines Boost Their Anticancer Performance?",
volume = "14",
number = "3",
doi = "10.3390/jfb14030173"
}

Ranković, M., Jevremović, A., Janošević-Ležaić, A., Arsenijević, A., Rupar, J., Dobričić, V., Nedić Vasiljević, B., Gavrilov, N., Bajuk-Bogdanović, D.,& Milojević-Rakić, M.. (2023). Can Zeolite-Supporting Acridines Boost Their Anticancer Performance?. in Journal of Functional Biomaterials
MDPI., 14(3).
https://doi.org/10.3390/jfb14030173

Ranković M, Jevremović A, Janošević-Ležaić A, Arsenijević A, Rupar J, Dobričić V, Nedić Vasiljević B, Gavrilov N, Bajuk-Bogdanović D, Milojević-Rakić M. Can Zeolite-Supporting Acridines Boost Their Anticancer Performance?. in Journal of Functional Biomaterials. 2023;14(3).
doi:10.3390/jfb14030173 .

Ranković, Maja, Jevremović, Anka, Janošević-Ležaić, Aleksandra, Arsenijević, Aleksandar, Rupar, Jelena, Dobričić, Vladimir, Nedić Vasiljević, Bojana, Gavrilov, Nemanja, Bajuk-Bogdanović, Danica, Milojević-Rakić, Maja, "Can Zeolite-Supporting Acridines Boost Their Anticancer Performance?" in Journal of Functional Biomaterials, 14, no. 3 (2023),
https://doi.org/10.3390/jfb14030173 . .

TY  - JOUR
AU  - Jevremović, Anka
AU  - Savić, Marjetka
AU  - Janošević-Ležaić, Aleksandra
AU  - Krstić, Jugoslav
AU  - Gavrilov, Nemanja
AU  - Bajuk-Bogdanović, Danica
AU  - Milojević-Rakić, Maja
AU  - Ćirić-Marjanović, Gordana
PY  - 2023
UR  - https://farfar.pharmacy.bg.ac.rs/handle/123456789/5342
AB  - The environmental application of the carbonized composites of the Zn-containing metal-organic framework MOF-5 and polyaniline (PANI) in its emeraldine salt and base forms (C-(MOF-5/PANI)) was investigated for the first time. Textural properties and particle size distributions revealed that composites are dominantly mesoporous and nanoscale in nature, while Raman spectroscopy revealed the ZnO phase beneath the carbon matrix. Adsorption of pesticide, dye, and metal cation on C-(MOF-5/PANI) composites in aqueous solutions was evaluated and compared with the behavior of the precursor components, carbonized MOF-5 (cMOF), and carbonized PANIs. A lower MOF-5 content in the precursor, a higher specific surface area, and the pore volume of the composites led to improved adsorption performance for acetamiprid (124 mg/g) and Methylene Blue (135 mg/g). The presence of O/N functional groups in composites is essential for the adsorption of nitrogen-rich pollutants through hydrogen bonding with an estimated monolayer capacity twice as high as that of cMOF. The proton exchange accompanying Cd2+ retention was associated with the Zn/Cd ion exchange, and the highest capacity (9.8 mg/g) was observed for the composite synthesized from the precursor with a high MOF-5 content. The multifunctionality of composites was evidenced in mixtures of pollutants where noticeably better performance for Cd2+ removal was found for the composite compared to cMOF. Competitive binding between three pollutants favored the adsorption of pesticide and dye, thereby hindering to some extent the ion exchange necessary for the removal of metal cations. The results emphasize the importance of the PANI form and MOF-5/PANI weight ratio in precursors for the development of surface, porosity, and active sites in C-(MOF-5/PANI) composites, thus guiding their environmental efficiency. The study also demonstrated that C-(MOF-5/PANI) composites retained studied pollutants much better than carbonized precursor PANIs and showed comparable or better adsorption ability than cMOF.
PB  - MDPI
T2  - Polymers
T1  - Environmental Potential of Carbonized MOF-5/PANI Composites for Pesticide, Dye, and Metal Cations—Can They Actually Retain Them All?
VL  - 15
IS  - 22
DO  - 10.3390/polym15224349
ER  - 

@article{
author = "Jevremović, Anka and Savić, Marjetka and Janošević-Ležaić, Aleksandra and Krstić, Jugoslav and Gavrilov, Nemanja and Bajuk-Bogdanović, Danica and Milojević-Rakić, Maja and Ćirić-Marjanović, Gordana",
year = "2023",
abstract = "The environmental application of the carbonized composites of the Zn-containing metal-organic framework MOF-5 and polyaniline (PANI) in its emeraldine salt and base forms (C-(MOF-5/PANI)) was investigated for the first time. Textural properties and particle size distributions revealed that composites are dominantly mesoporous and nanoscale in nature, while Raman spectroscopy revealed the ZnO phase beneath the carbon matrix. Adsorption of pesticide, dye, and metal cation on C-(MOF-5/PANI) composites in aqueous solutions was evaluated and compared with the behavior of the precursor components, carbonized MOF-5 (cMOF), and carbonized PANIs. A lower MOF-5 content in the precursor, a higher specific surface area, and the pore volume of the composites led to improved adsorption performance for acetamiprid (124 mg/g) and Methylene Blue (135 mg/g). The presence of O/N functional groups in composites is essential for the adsorption of nitrogen-rich pollutants through hydrogen bonding with an estimated monolayer capacity twice as high as that of cMOF. The proton exchange accompanying Cd2+ retention was associated with the Zn/Cd ion exchange, and the highest capacity (9.8 mg/g) was observed for the composite synthesized from the precursor with a high MOF-5 content. The multifunctionality of composites was evidenced in mixtures of pollutants where noticeably better performance for Cd2+ removal was found for the composite compared to cMOF. Competitive binding between three pollutants favored the adsorption of pesticide and dye, thereby hindering to some extent the ion exchange necessary for the removal of metal cations. The results emphasize the importance of the PANI form and MOF-5/PANI weight ratio in precursors for the development of surface, porosity, and active sites in C-(MOF-5/PANI) composites, thus guiding their environmental efficiency. The study also demonstrated that C-(MOF-5/PANI) composites retained studied pollutants much better than carbonized precursor PANIs and showed comparable or better adsorption ability than cMOF.",
publisher = "MDPI",
journal = "Polymers",
title = "Environmental Potential of Carbonized MOF-5/PANI Composites for Pesticide, Dye, and Metal Cations—Can They Actually Retain Them All?",
volume = "15",
number = "22",
doi = "10.3390/polym15224349"
}

Jevremović, A., Savić, M., Janošević-Ležaić, A., Krstić, J., Gavrilov, N., Bajuk-Bogdanović, D., Milojević-Rakić, M.,& Ćirić-Marjanović, G.. (2023). Environmental Potential of Carbonized MOF-5/PANI Composites for Pesticide, Dye, and Metal Cations—Can They Actually Retain Them All?. in Polymers
MDPI., 15(22).
https://doi.org/10.3390/polym15224349

Jevremović A, Savić M, Janošević-Ležaić A, Krstić J, Gavrilov N, Bajuk-Bogdanović D, Milojević-Rakić M, Ćirić-Marjanović G. Environmental Potential of Carbonized MOF-5/PANI Composites for Pesticide, Dye, and Metal Cations—Can They Actually Retain Them All?. in Polymers. 2023;15(22).
doi:10.3390/polym15224349 .

Jevremović, Anka, Savić, Marjetka, Janošević-Ležaić, Aleksandra, Krstić, Jugoslav, Gavrilov, Nemanja, Bajuk-Bogdanović, Danica, Milojević-Rakić, Maja, Ćirić-Marjanović, Gordana, "Environmental Potential of Carbonized MOF-5/PANI Composites for Pesticide, Dye, and Metal Cations—Can They Actually Retain Them All?" in Polymers, 15, no. 22 (2023),
https://doi.org/10.3390/polym15224349 . .

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  - Bajuk-Bogdanović, Danica
AU  - Krstić, Jugoslav
AU  - Jovanović, Zoran
AU  - Mravik, Željko
AU  - Kovač, Janez
AU  - Gavrilov, Nemanja
PY  - 2022
UR  - https://farfar.pharmacy.bg.ac.rs/handle/123456789/4070
AB  - Transformation of tannic acid (TA), a cheap, abundant and environmentally friendly (by)product, upon carbonization at various temperatures was examined as it is extensively being used in energy storing devices. In addition of reviling what is happening with TA upon carbonization, a step further has been taken to scrutinize the role of carbonized TA (CTA) playing in energy storage composites. Increasing the carbonization temperature from 500 ◦C to 800 ◦C led to a nine orders of magnitude increase in conductivity, from 9⋅10–9 S cm
PB  - Elsevier Ltd
T2  - Fuel
T1  - What role does carbonized tannic acid play in energy storage composites?
VL  - 312
DO  - 10.1016/j.fuel.2021.122930
ER  - 

@article{
author = "Janošević-Ležaić, Aleksandra and Bajuk-Bogdanović, Danica and Krstić, Jugoslav and Jovanović, Zoran and Mravik, Željko and Kovač, Janez and Gavrilov, Nemanja",
year = "2022",
abstract = "Transformation of tannic acid (TA), a cheap, abundant and environmentally friendly (by)product, upon carbonization at various temperatures was examined as it is extensively being used in energy storing devices. In addition of reviling what is happening with TA upon carbonization, a step further has been taken to scrutinize the role of carbonized TA (CTA) playing in energy storage composites. Increasing the carbonization temperature from 500 ◦C to 800 ◦C led to a nine orders of magnitude increase in conductivity, from 9⋅10–9 S cm",
publisher = "Elsevier Ltd",
journal = "Fuel",
title = "What role does carbonized tannic acid play in energy storage composites?",
volume = "312",
doi = "10.1016/j.fuel.2021.122930"
}

Janošević-Ležaić, A., Bajuk-Bogdanović, D., Krstić, J., Jovanović, Z., Mravik, Ž., Kovač, J.,& Gavrilov, N.. (2022). What role does carbonized tannic acid play in energy storage composites?. in Fuel
Elsevier Ltd., 312.
https://doi.org/10.1016/j.fuel.2021.122930

Janošević-Ležaić A, Bajuk-Bogdanović D, Krstić J, Jovanović Z, Mravik Ž, Kovač J, Gavrilov N. What role does carbonized tannic acid play in energy storage composites?. in Fuel. 2022;312.
doi:10.1016/j.fuel.2021.122930 .

Janošević-Ležaić, Aleksandra, Bajuk-Bogdanović, Danica, Krstić, Jugoslav, Jovanović, Zoran, Mravik, Željko, Kovač, Janez, Gavrilov, Nemanja, "What role does carbonized tannic acid play in energy storage composites?" in Fuel, 312 (2022),
https://doi.org/10.1016/j.fuel.2021.122930 . .

TY  - JOUR
AU  - Rupar, Jelena
AU  - Bajuk-Bogdanović, Danica
AU  - Milojević-Rakić, Maja
AU  - Krstić, Jugoslav
AU  - Upadhyay, Kush
AU  - Gavrilov, Nemanja
AU  - Janošević-Ležaić, Aleksandra
PY  - 2022
UR  - https://farfar.pharmacy.bg.ac.rs/handle/123456789/4069
AB  - Here, we propose a novel, electrochemical preparation of in situ N-doped alginate-based carbon precursors with monodispersed zinc ions. Obtained carbons were evaluated by spectroscopic (FTIR, Raman and XPS), textural (N2 physisorption), microscopic (TEM) and elemental (SEM-EDS) descriptors to establish their distinctive fea- tures originating from different synthetic procedures. Carbons characteristics were assessed in view of several carbonization temperatures applied for their preparation from alginate precursors, and individual and joint effect of zinc and nitrogen on the precursor. Obtained Zn monodispersion, emphasizes the significance of electro- chemical preparation, allowing increasing temperature to induce changes from its ionic form to carbonate and oxide, while at 800 ◦C ZnO further reduces and evaporates. Since homogeneously dispersed Zn species acts as porosity evolving agent during carbonization, a substantial surface area is developed, in the range 718–1056 m2 g
PB  - Elsevier B.V.
T2  - Microporous and Mesoporous Materials
T1  - Tailored porosity development in carbons via Zn2+ monodispersion: Fitting supercapacitors
VL  - 335
DO  - 10.1016/j.micromeso.2022.111790
ER  - 

@article{
author = "Rupar, Jelena and Bajuk-Bogdanović, Danica and Milojević-Rakić, Maja and Krstić, Jugoslav and Upadhyay, Kush and Gavrilov, Nemanja and Janošević-Ležaić, Aleksandra",
year = "2022",
abstract = "Here, we propose a novel, electrochemical preparation of in situ N-doped alginate-based carbon precursors with monodispersed zinc ions. Obtained carbons were evaluated by spectroscopic (FTIR, Raman and XPS), textural (N2 physisorption), microscopic (TEM) and elemental (SEM-EDS) descriptors to establish their distinctive fea- tures originating from different synthetic procedures. Carbons characteristics were assessed in view of several carbonization temperatures applied for their preparation from alginate precursors, and individual and joint effect of zinc and nitrogen on the precursor. Obtained Zn monodispersion, emphasizes the significance of electro- chemical preparation, allowing increasing temperature to induce changes from its ionic form to carbonate and oxide, while at 800 ◦C ZnO further reduces and evaporates. Since homogeneously dispersed Zn species acts as porosity evolving agent during carbonization, a substantial surface area is developed, in the range 718–1056 m2 g",
publisher = "Elsevier B.V.",
journal = "Microporous and Mesoporous Materials",
title = "Tailored porosity development in carbons via Zn2+ monodispersion: Fitting supercapacitors",
volume = "335",
doi = "10.1016/j.micromeso.2022.111790"
}

Rupar, J., Bajuk-Bogdanović, D., Milojević-Rakić, M., Krstić, J., Upadhyay, K., Gavrilov, N.,& Janošević-Ležaić, A.. (2022). Tailored porosity development in carbons via Zn2+ monodispersion: Fitting supercapacitors. in Microporous and Mesoporous Materials
Elsevier B.V.., 335.
https://doi.org/10.1016/j.micromeso.2022.111790

Rupar J, Bajuk-Bogdanović D, Milojević-Rakić M, Krstić J, Upadhyay K, Gavrilov N, Janošević-Ležaić A. Tailored porosity development in carbons via Zn2+ monodispersion: Fitting supercapacitors. in Microporous and Mesoporous Materials. 2022;335.
doi:10.1016/j.micromeso.2022.111790 .

Rupar, Jelena, Bajuk-Bogdanović, Danica, Milojević-Rakić, Maja, Krstić, Jugoslav, Upadhyay, Kush, Gavrilov, Nemanja, Janošević-Ležaić, Aleksandra, "Tailored porosity development in carbons via Zn2+ monodispersion: Fitting supercapacitors" in Microporous and Mesoporous Materials, 335 (2022),
https://doi.org/10.1016/j.micromeso.2022.111790 . .

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  - Popadić, Daliborka
AU  - Gavrilov, Nemanja
AU  - Ignjatović, Ljubiša
AU  - Krajišnik, Danina
AU  - Mentus, Slavko
AU  - Milojević-Rakić, Maja
AU  - Bajuk-Bogdanović, Danica
PY  - 2022
UR  - https://www.mdpi.com/2073-4344/12/5/519
UR  - https://farfar.pharmacy.bg.ac.rs/handle/123456789/4099
AB  - Unmodified natural silicates (bentonite, kaolin, clinoptilolite and diatomites) were tested as adsorbents for the organic pollutants in water tables using Methylene Blue (MB) as the model adsorbate. Among the selected materials, bentonite adsorbed as much as 237 mg/g, confirming its excellent suitability for pollutant removal. Spectral evidence confirmed successful MB immobilization at the bentonite surface. Furthermore, the thermal treatment of MB-saturated adsorbent in an inert atmosphere at 700 °C produced a carbon/silicate composite. EDX confirmed the formation of the nitrogen-doped carbon overlay on the silica scaffold and the obtained composite material was probed as an electrode material for oxygen reduction in an alkaline solution. Reduction proceeded via a two-electron mechanism with the main product being HO2−, a known nucleophile, which was subsequently used to degrade/demethylate MB. The composite showed a considerable 70% MB removal rate after an hour of electrochemical treatment. The synergy between the processes of adsorption of MB and the surface-generated HO2− dictates the efficiency of the method and points to a possible route for spent adsorbent reuse in the form of a durable product for environmental protection.
PB  - MDPI
T2  - Catalysts
T1  - How to Obtain Maximum Environmental Applicability from Natural Silicates
VL  - 12
IS  - 5
DO  - 10.3390/catal12050519
ER  - 

@article{
author = "Popadić, Daliborka and Gavrilov, Nemanja and Ignjatović, Ljubiša and Krajišnik, Danina and Mentus, Slavko and Milojević-Rakić, Maja and Bajuk-Bogdanović, Danica",
year = "2022",
abstract = "Unmodified natural silicates (bentonite, kaolin, clinoptilolite and diatomites) were tested as adsorbents for the organic pollutants in water tables using Methylene Blue (MB) as the model adsorbate. Among the selected materials, bentonite adsorbed as much as 237 mg/g, confirming its excellent suitability for pollutant removal. Spectral evidence confirmed successful MB immobilization at the bentonite surface. Furthermore, the thermal treatment of MB-saturated adsorbent in an inert atmosphere at 700 °C produced a carbon/silicate composite. EDX confirmed the formation of the nitrogen-doped carbon overlay on the silica scaffold and the obtained composite material was probed as an electrode material for oxygen reduction in an alkaline solution. Reduction proceeded via a two-electron mechanism with the main product being HO2−, a known nucleophile, which was subsequently used to degrade/demethylate MB. The composite showed a considerable 70% MB removal rate after an hour of electrochemical treatment. The synergy between the processes of adsorption of MB and the surface-generated HO2− dictates the efficiency of the method and points to a possible route for spent adsorbent reuse in the form of a durable product for environmental protection.",
publisher = "MDPI",
journal = "Catalysts",
title = "How to Obtain Maximum Environmental Applicability from Natural Silicates",
volume = "12",
number = "5",
doi = "10.3390/catal12050519"
}

Popadić, D., Gavrilov, N., Ignjatović, L., Krajišnik, D., Mentus, S., Milojević-Rakić, M.,& Bajuk-Bogdanović, D.. (2022). How to Obtain Maximum Environmental Applicability from Natural Silicates. in Catalysts
MDPI., 12(5).
https://doi.org/10.3390/catal12050519

Popadić D, Gavrilov N, Ignjatović L, Krajišnik D, Mentus S, Milojević-Rakić M, Bajuk-Bogdanović D. How to Obtain Maximum Environmental Applicability from Natural Silicates. in Catalysts. 2022;12(5).
doi:10.3390/catal12050519 .

Popadić, Daliborka, Gavrilov, Nemanja, Ignjatović, Ljubiša, Krajišnik, Danina, Mentus, Slavko, Milojević-Rakić, Maja, Bajuk-Bogdanović, Danica, "How to Obtain Maximum Environmental Applicability from Natural Silicates" in Catalysts, 12, no. 5 (2022),
https://doi.org/10.3390/catal12050519 . .

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  - 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  - 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  - Gledović, Ana
AU  - Janošević-Ležaić, Aleksandra
AU  - Krstonošić, Veljko
AU  - Đoković, Jelena
AU  - Nikolić, Ines
AU  - Bajuk-Bogdanović, Danica
AU  - Antić-Stanković, Jelena
AU  - Ranđelović, Danijela
AU  - Savić, Sanela M.
AU  - Filipović, Mila
AU  - Tamburić, Slobodanka
AU  - Savić, Snežana
PY  - 2020
UR  - https://farfar.pharmacy.bg.ac.rs/handle/123456789/3581
AB  - Considering a growing demand for medicinal/cosmetic products with natural actives, this study focuses on the low-energy nanoemulsions (LE-NEs) prepared via the Phase inversion composition (PIC) method at room temperature as potential carriers for natural oil. Four different red raspberry seed oils (ROs) were tested, as follows: cold-pressed vs. CO2- extracted, organic vs. non-organic, refined vs. unrefined. The oil phase was optimized with Tocopheryl acetate and Isostearyl isostearate, while water phase was adjusted with either glycerol or an antioxidant hydro-glycolic extract. This study has used a combined approach to formulation development, employing both conventional methods (pseudo-ternary phase diagram - PTPD, electrical conductivity, particle size measurements, microscopical analysis, and rheological measurements) and the methods novel to this area, such as textural analysis and Raman spectroscopy. Raman spectroscopy has detected fine differences in chemical composition among ROs, and it detected the interactions within nanoemulsions. It was shown that the cold-pressed, unrefined, organic grade oil (RO2) with 6.62% saturated fatty acids and 92.25% unsaturated fatty acids, was optimal for the LE-NEs. Textural analysis confirmed the existence of cubic gel-like phase as a crucial step in the formation of stable RO2-loaded LE-NEs, with droplets in the narrow nano-range (125 to 135 nm; PDI ≤ 0.1). The DPPH test in methanol and ABTS in aqueous medium have revealed a synergistic free radical scavenging effect between lipophilic and hydrophilic antioxidants in LE-NEs. The nanoemulsion carrier has improved the biological effect of raw materials on HeLa cervical adenocarcinoma cells, while exhibiting good safety profile, as confirmed on MRC-5 normal human lung fibroblasts. Overall, this study has shown that low-energy nanoemulsions present very promising carriers for topical delivery of natural bioactives. Raman spectroscopy and textural analysis have proven to be a useful addition to the arsenal of methods used in the formulation and characterization of nanoemulsion systems.
PB  - Public Library of Science
T2  - PLoS ONE
T1  - Low-energy nanoemulsions as carriers for red raspberry seed oil: Formulation approach based on Raman spectroscopy and textural analysis, physicochemical properties, stability and in vitro antioxidant/ biological activity
VL  - 15
IS  - 4
DO  - 10.1371/journal.pone.0230993
ER  - 

@article{
author = "Gledović, Ana and Janošević-Ležaić, Aleksandra and Krstonošić, Veljko and Đoković, Jelena and Nikolić, Ines and Bajuk-Bogdanović, Danica and Antić-Stanković, Jelena and Ranđelović, Danijela and Savić, Sanela M. and Filipović, Mila and Tamburić, Slobodanka and Savić, Snežana",
year = "2020",
abstract = "Considering a growing demand for medicinal/cosmetic products with natural actives, this study focuses on the low-energy nanoemulsions (LE-NEs) prepared via the Phase inversion composition (PIC) method at room temperature as potential carriers for natural oil. Four different red raspberry seed oils (ROs) were tested, as follows: cold-pressed vs. CO2- extracted, organic vs. non-organic, refined vs. unrefined. The oil phase was optimized with Tocopheryl acetate and Isostearyl isostearate, while water phase was adjusted with either glycerol or an antioxidant hydro-glycolic extract. This study has used a combined approach to formulation development, employing both conventional methods (pseudo-ternary phase diagram - PTPD, electrical conductivity, particle size measurements, microscopical analysis, and rheological measurements) and the methods novel to this area, such as textural analysis and Raman spectroscopy. Raman spectroscopy has detected fine differences in chemical composition among ROs, and it detected the interactions within nanoemulsions. It was shown that the cold-pressed, unrefined, organic grade oil (RO2) with 6.62% saturated fatty acids and 92.25% unsaturated fatty acids, was optimal for the LE-NEs. Textural analysis confirmed the existence of cubic gel-like phase as a crucial step in the formation of stable RO2-loaded LE-NEs, with droplets in the narrow nano-range (125 to 135 nm; PDI ≤ 0.1). The DPPH test in methanol and ABTS in aqueous medium have revealed a synergistic free radical scavenging effect between lipophilic and hydrophilic antioxidants in LE-NEs. The nanoemulsion carrier has improved the biological effect of raw materials on HeLa cervical adenocarcinoma cells, while exhibiting good safety profile, as confirmed on MRC-5 normal human lung fibroblasts. Overall, this study has shown that low-energy nanoemulsions present very promising carriers for topical delivery of natural bioactives. Raman spectroscopy and textural analysis have proven to be a useful addition to the arsenal of methods used in the formulation and characterization of nanoemulsion systems.",
publisher = "Public Library of Science",
journal = "PLoS ONE",
title = "Low-energy nanoemulsions as carriers for red raspberry seed oil: Formulation approach based on Raman spectroscopy and textural analysis, physicochemical properties, stability and in vitro antioxidant/ biological activity",
volume = "15",
number = "4",
doi = "10.1371/journal.pone.0230993"
}

Gledović, A., Janošević-Ležaić, A., Krstonošić, V., Đoković, J., Nikolić, I., Bajuk-Bogdanović, D., Antić-Stanković, J., Ranđelović, D., Savić, S. M., Filipović, M., Tamburić, S.,& Savić, S.. (2020). Low-energy nanoemulsions as carriers for red raspberry seed oil: Formulation approach based on Raman spectroscopy and textural analysis, physicochemical properties, stability and in vitro antioxidant/ biological activity. in PLoS ONE
Public Library of Science., 15(4).
https://doi.org/10.1371/journal.pone.0230993

Gledović A, Janošević-Ležaić A, Krstonošić V, Đoković J, Nikolić I, Bajuk-Bogdanović D, Antić-Stanković J, Ranđelović D, Savić SM, Filipović M, Tamburić S, Savić S. Low-energy nanoemulsions as carriers for red raspberry seed oil: Formulation approach based on Raman spectroscopy and textural analysis, physicochemical properties, stability and in vitro antioxidant/ biological activity. in PLoS ONE. 2020;15(4).
doi:10.1371/journal.pone.0230993 .

Gledović, Ana, Janošević-Ležaić, Aleksandra, Krstonošić, Veljko, Đoković, Jelena, Nikolić, Ines, Bajuk-Bogdanović, Danica, Antić-Stanković, Jelena, Ranđelović, Danijela, Savić, Sanela M., Filipović, Mila, Tamburić, Slobodanka, Savić, Snežana, "Low-energy nanoemulsions as carriers for red raspberry seed oil: Formulation approach based on Raman spectroscopy and textural analysis, physicochemical properties, stability and in vitro antioxidant/ biological activity" in PLoS ONE, 15, no. 4 (2020),
https://doi.org/10.1371/journal.pone.0230993 . .

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  - Kashima, Keita
AU  - Fujisaki, Tomoyuki
AU  - Serrano-Luginbuhl, Sandra
AU  - Kissner, Reinhard
AU  - Janošević-Ležaić, Aleksandra
AU  - Bajuk-Bogdanović, Danica
AU  - Ćirić-Marjanović, Gordana
AU  - Busato, Stephan
AU  - Ishikawa, Takashi
AU  - Walde, Peter
PY  - 2019
UR  - https://farfar.pharmacy.bg.ac.rs/handle/123456789/3309
AB  - Many previous studies have shown that (i) the oxidation of aniline or the aniline dimer p-aminodiphenyl-amine (PADPA) in a slightly acidic aqueous solution can be catalyzed with heme peroxidases or multicopper laccases and that (ii) subsequent reactions lead to oligomeric or polymeric products, which resemble chemically synthesized polyaniline in its conductive emeraldine salt form (PANI-ES), provided that (iii) an anionic "template" is present in the reaction medium. Good templates are anionic polyelectrolytes, micelles, or vesicles. Under optimal conditions, their presence directs the reactions in a positive way toward the desired formation of PANI-ES-type products. The effect of four different types of anionic templates on the formation of PANI-ES-like products from PADPA was investigated and compared by using Trametes versicolor laccase (TvL) as a catalyst in an aqueous pH 3.5 solution at room temperature. All four templates contain sulfonate groups: the sodium salt of the polyelectrolyte sulfonated polystyrene (SPS), micelles from sodium dodecylbenzenesulfonate (SDBS), vesicles from a 1:1 molar mixture of SDBS and decanoic acid, and vesicles from sodium bis(2-ethylhexyl) sulfosuccinate (AOT). Although with all four templates, stable, inkjet-printable solutions or suspensions consisting of PANI-ES-type products were obtained under optimized conditions, considerably higher amounts of TvL were required with SDBS micelles to achieve comparable monomer conversion to PANI-ES-like products during the same time period when compared to those with SPS or the two types of vesicles. This makes SDBS micelles less attractive as templates for the investigated reaction. In situ UV/vis/near-infrared, electron paramagnetic resonance (EPR), and Raman spectroscopy measurements in combination with an high-performance liquid chromatography analysis of extracted reaction products, which were deprotonated and chemically reduced, showed seemingly small but significant differences in the composition of the mixtures obtained when reaching reaction equilibrium after 24 h. With the two vesicle systems, the content of unwanted substituted phenazine units was lower than in the case of SPS polyelectrolyte and SDBS micelles. The EPR spectra indicate a more localized, narrower distribution of electronic states of the paramagnetic centers of the PANI-ES-type products synthesized in the presence of the two vesicle systems when compared to that of the similar products obtained with the SPS polyelectrolyte and SDBS micelles as templates. Overall, the data obtained from the different complementary methods indicate that with the two vesicle systems structurally more uniform (regular) PANI-ES-type products formed. Among the two investigated vesicle systems, for the investigated reaction (oxidation of PADPA with TvL and O-2), AOT appears a somewhat better choice as it leads to a higher content of the PANI-ES polaron form.
PB  - Amer Chemical Soc, Washington
T2  - ACS Omega
T1  - Effect of Template Type on the Trametes versicolor Laccase-Catalyzed Oligomerization of the Aniline Dimer p-Aminodiphenylamine (PADPA)
VL  - 4
IS  - 2
SP  - 2931
EP  - 2947
DO  - 10.1021/acsomega.8b03441
ER  - 

@article{
author = "Kashima, Keita and Fujisaki, Tomoyuki and Serrano-Luginbuhl, Sandra and Kissner, Reinhard and Janošević-Ležaić, Aleksandra and Bajuk-Bogdanović, Danica and Ćirić-Marjanović, Gordana and Busato, Stephan and Ishikawa, Takashi and Walde, Peter",
year = "2019",
abstract = "Many previous studies have shown that (i) the oxidation of aniline or the aniline dimer p-aminodiphenyl-amine (PADPA) in a slightly acidic aqueous solution can be catalyzed with heme peroxidases or multicopper laccases and that (ii) subsequent reactions lead to oligomeric or polymeric products, which resemble chemically synthesized polyaniline in its conductive emeraldine salt form (PANI-ES), provided that (iii) an anionic "template" is present in the reaction medium. Good templates are anionic polyelectrolytes, micelles, or vesicles. Under optimal conditions, their presence directs the reactions in a positive way toward the desired formation of PANI-ES-type products. The effect of four different types of anionic templates on the formation of PANI-ES-like products from PADPA was investigated and compared by using Trametes versicolor laccase (TvL) as a catalyst in an aqueous pH 3.5 solution at room temperature. All four templates contain sulfonate groups: the sodium salt of the polyelectrolyte sulfonated polystyrene (SPS), micelles from sodium dodecylbenzenesulfonate (SDBS), vesicles from a 1:1 molar mixture of SDBS and decanoic acid, and vesicles from sodium bis(2-ethylhexyl) sulfosuccinate (AOT). Although with all four templates, stable, inkjet-printable solutions or suspensions consisting of PANI-ES-type products were obtained under optimized conditions, considerably higher amounts of TvL were required with SDBS micelles to achieve comparable monomer conversion to PANI-ES-like products during the same time period when compared to those with SPS or the two types of vesicles. This makes SDBS micelles less attractive as templates for the investigated reaction. In situ UV/vis/near-infrared, electron paramagnetic resonance (EPR), and Raman spectroscopy measurements in combination with an high-performance liquid chromatography analysis of extracted reaction products, which were deprotonated and chemically reduced, showed seemingly small but significant differences in the composition of the mixtures obtained when reaching reaction equilibrium after 24 h. With the two vesicle systems, the content of unwanted substituted phenazine units was lower than in the case of SPS polyelectrolyte and SDBS micelles. The EPR spectra indicate a more localized, narrower distribution of electronic states of the paramagnetic centers of the PANI-ES-type products synthesized in the presence of the two vesicle systems when compared to that of the similar products obtained with the SPS polyelectrolyte and SDBS micelles as templates. Overall, the data obtained from the different complementary methods indicate that with the two vesicle systems structurally more uniform (regular) PANI-ES-type products formed. Among the two investigated vesicle systems, for the investigated reaction (oxidation of PADPA with TvL and O-2), AOT appears a somewhat better choice as it leads to a higher content of the PANI-ES polaron form.",
publisher = "Amer Chemical Soc, Washington",
journal = "ACS Omega",
title = "Effect of Template Type on the Trametes versicolor Laccase-Catalyzed Oligomerization of the Aniline Dimer p-Aminodiphenylamine (PADPA)",
volume = "4",
number = "2",
pages = "2931-2947",
doi = "10.1021/acsomega.8b03441"
}

Kashima, K., Fujisaki, T., Serrano-Luginbuhl, S., Kissner, R., Janošević-Ležaić, A., Bajuk-Bogdanović, D., Ćirić-Marjanović, G., Busato, S., Ishikawa, T.,& Walde, P.. (2019). Effect of Template Type on the Trametes versicolor Laccase-Catalyzed Oligomerization of the Aniline Dimer p-Aminodiphenylamine (PADPA). in ACS Omega
Amer Chemical Soc, Washington., 4(2), 2931-2947.
https://doi.org/10.1021/acsomega.8b03441

Kashima K, Fujisaki T, Serrano-Luginbuhl S, Kissner R, Janošević-Ležaić A, Bajuk-Bogdanović D, Ćirić-Marjanović G, Busato S, Ishikawa T, Walde P. Effect of Template Type on the Trametes versicolor Laccase-Catalyzed Oligomerization of the Aniline Dimer p-Aminodiphenylamine (PADPA). in ACS Omega. 2019;4(2):2931-2947.
doi:10.1021/acsomega.8b03441 .

Kashima, Keita, Fujisaki, Tomoyuki, Serrano-Luginbuhl, Sandra, Kissner, Reinhard, Janošević-Ležaić, Aleksandra, Bajuk-Bogdanović, Danica, Ćirić-Marjanović, Gordana, Busato, Stephan, Ishikawa, Takashi, Walde, Peter, "Effect of Template Type on the Trametes versicolor Laccase-Catalyzed Oligomerization of the Aniline Dimer p-Aminodiphenylamine (PADPA)" in ACS Omega, 4, no. 2 (2019):2931-2947,
https://doi.org/10.1021/acsomega.8b03441 . .

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  - Kashima, Keita
AU  - Fujisaki, Tomoyuki
AU  - Serrano-Luginbuhl, Sandra
AU  - Khaydarov, Abbos
AU  - Kissner, Reinhard
AU  - Janošević-Ležaić, Aleksandra
AU  - Bajuk-Bogdanović, Danica
AU  - Ćirić-Marjanović, Gordana
AU  - Schuler, Lukas D.
AU  - Walde, Peter
PY  - 2018
UR  - https://farfar.pharmacy.bg.ac.rs/handle/123456789/3051
AB  - The Trametes versicolor laccase (TvL)-catalysed oligomerisation of the aniline dimer p-aminodiphenylamine (PADPA) was investigated in an aqueous medium of pH = 3.5, containing 80-100 nm-sized anionic vesicles formed from AOT, the sodium salt of bis(2-ethylhexyl)sulfosuccinic acid. If run under optimal conditions, the reaction yields oligomeric products which resemble the emeraldine salt form of polyaniline (PANI-ES) in its polaron state, known to be the only oxidation state of linear PANI which is electrically conductive. The vesicles serve as "templates" for obtaining products with the desired PANI-ES-like features. For this complex, heterogeneous, vesicle-assisted, and enzyme-mediated reaction, in which dissolved dioxygen also takes part as a re-oxidant for TvL, small changes in the composition of the reaction mixture can have significant effects. Initial conditions may not only affect the kinetics of the reaction, but also the outcome, i.e., the product distribution once the reaction reaches its equilibrium state. While a change in the reaction temperature from T approximate to 25 to 5 degrees C mainly influenced the rate of reaction, increase in enzyme concentration and the presence of millimolar concentrations of chloride ions were found to have significant undesired effects on the outcome of the reaction. Chloride ions, which may originate from the preparation of the pH = 3.5 solution, inhibit TvL, such that higher TvL concentrations are required than without chloride to yield the same product distribution for the same reaction runtime as in the absence of chloride. With TvL concentrations much higher than the elaborated value, the products obtained clearly were different and over-oxidised. Thus, a change in the activity of the enzyme was found to have influence not only on kinetics but also led to a change in the final product distribution, molecular structure and electrical properties, which was a surprising find. The complementary analytical methods which we used in this work were in situ UV/vis/NIR, EPR, and Raman spectroscopy measurements, in combination with a detailed ex situ HPLC analysis and molecular dynamics simulations. With the results obtained, we would like to recall the often neglected or ignored fact that it is important to describe and pay attention to the experimental details, since this matters for being able to perform experiments in a reproducible way.
PB  - Royal Soc Chemistry, Cambridge
T2  - Russian Journal of Genetics
T1  - How experimental details matter. The case of a laccase-catalysed oligomerisation reaction
VL  - 8
IS  - 58
SP  - 33229
EP  - 33242
DO  - 10.1039/c8ra05731a
ER  - 

@article{
author = "Kashima, Keita and Fujisaki, Tomoyuki and Serrano-Luginbuhl, Sandra and Khaydarov, Abbos and Kissner, Reinhard and Janošević-Ležaić, Aleksandra and Bajuk-Bogdanović, Danica and Ćirić-Marjanović, Gordana and Schuler, Lukas D. and Walde, Peter",
year = "2018",
abstract = "The Trametes versicolor laccase (TvL)-catalysed oligomerisation of the aniline dimer p-aminodiphenylamine (PADPA) was investigated in an aqueous medium of pH = 3.5, containing 80-100 nm-sized anionic vesicles formed from AOT, the sodium salt of bis(2-ethylhexyl)sulfosuccinic acid. If run under optimal conditions, the reaction yields oligomeric products which resemble the emeraldine salt form of polyaniline (PANI-ES) in its polaron state, known to be the only oxidation state of linear PANI which is electrically conductive. The vesicles serve as "templates" for obtaining products with the desired PANI-ES-like features. For this complex, heterogeneous, vesicle-assisted, and enzyme-mediated reaction, in which dissolved dioxygen also takes part as a re-oxidant for TvL, small changes in the composition of the reaction mixture can have significant effects. Initial conditions may not only affect the kinetics of the reaction, but also the outcome, i.e., the product distribution once the reaction reaches its equilibrium state. While a change in the reaction temperature from T approximate to 25 to 5 degrees C mainly influenced the rate of reaction, increase in enzyme concentration and the presence of millimolar concentrations of chloride ions were found to have significant undesired effects on the outcome of the reaction. Chloride ions, which may originate from the preparation of the pH = 3.5 solution, inhibit TvL, such that higher TvL concentrations are required than without chloride to yield the same product distribution for the same reaction runtime as in the absence of chloride. With TvL concentrations much higher than the elaborated value, the products obtained clearly were different and over-oxidised. Thus, a change in the activity of the enzyme was found to have influence not only on kinetics but also led to a change in the final product distribution, molecular structure and electrical properties, which was a surprising find. The complementary analytical methods which we used in this work were in situ UV/vis/NIR, EPR, and Raman spectroscopy measurements, in combination with a detailed ex situ HPLC analysis and molecular dynamics simulations. With the results obtained, we would like to recall the often neglected or ignored fact that it is important to describe and pay attention to the experimental details, since this matters for being able to perform experiments in a reproducible way.",
publisher = "Royal Soc Chemistry, Cambridge",
journal = "Russian Journal of Genetics",
title = "How experimental details matter. The case of a laccase-catalysed oligomerisation reaction",
volume = "8",
number = "58",
pages = "33229-33242",
doi = "10.1039/c8ra05731a"
}

Kashima, K., Fujisaki, T., Serrano-Luginbuhl, S., Khaydarov, A., Kissner, R., Janošević-Ležaić, A., Bajuk-Bogdanović, D., Ćirić-Marjanović, G., Schuler, L. D.,& Walde, P.. (2018). How experimental details matter. The case of a laccase-catalysed oligomerisation reaction. in Russian Journal of Genetics
Royal Soc Chemistry, Cambridge., 8(58), 33229-33242.
https://doi.org/10.1039/c8ra05731a

Kashima K, Fujisaki T, Serrano-Luginbuhl S, Khaydarov A, Kissner R, Janošević-Ležaić A, Bajuk-Bogdanović D, Ćirić-Marjanović G, Schuler LD, Walde P. How experimental details matter. The case of a laccase-catalysed oligomerisation reaction. in Russian Journal of Genetics. 2018;8(58):33229-33242.
doi:10.1039/c8ra05731a .

Kashima, Keita, Fujisaki, Tomoyuki, Serrano-Luginbuhl, Sandra, Khaydarov, Abbos, Kissner, Reinhard, Janošević-Ležaić, Aleksandra, Bajuk-Bogdanović, Danica, Ćirić-Marjanović, Gordana, Schuler, Lukas D., Walde, Peter, "How experimental details matter. The case of a laccase-catalysed oligomerisation reaction" in Russian Journal of Genetics, 8, no. 58 (2018):33229-33242,
https://doi.org/10.1039/c8ra05731a . .

TY  - JOUR
AU  - Jovanović, Svetlana
AU  - Holclajtner-Antunović, Ivanka
AU  - Uskoković-Marković, Snežana
AU  - Bajuk-Bogdanović, Danica
AU  - Pavlović, Vladimir
AU  - Tosić, Dragana
AU  - Milenković, Marina
AU  - Todorović-Marković, Biljana
PY  - 2018
UR  - https://farfar.pharmacy.bg.ac.rs/handle/123456789/3168
AB  - Antibacterial properties of graphene oxide (GO) have been studied extensively in the last few years, while for polyoxometalates there are just a few researches. Herein, we prepared nanocomposites of GO and different amounts of 12-molybdophosphoric acid (MoPA) and analyzed their antibacterial activity and both structural and morphological properties. In nanocomposites with higher amounts of MoPA, graphene sheets were significantly changed with disrupted flat, graphene-like morphology of GO. In the nanocomposites with low MoPA content, flat GO morphology was preserved. Additionally, structural analyses showed some changes in symmetry of the Keggin anion as a consequence of interactions between GO and MoPA, the increase in structural disorder and the lowering of electron density in GO structure due to interaction with MoPA. We have studied antibacterial properties on the gram-positive: Staphylococcus aureus, Staphylococcus epidermidis, Bacillus subtilis; and the gram-negative bacteria: Escherichia coil, Klebsiella pneumoniae, Pseudomonas aeruginosa and Salmonella abony. Only a mild antibacterial effect of GO and nanocomposites with low amount of MoPA against Bacillus subtilis was observed, while the rest of analyzed materials did not show any antibacterial activity.
PB  - Elsevier Science Sa, Lausanne
T2  - Materials Chemistry and Physics
T1  - Modification of graphene oxide surfaces with 12-molybdophosphoric acid: Structural and antibacterial study
VL  - 213
SP  - 157
EP  - 167
DO  - 10.1016/j.matchemphys.2018.04.011
ER  - 

@article{
author = "Jovanović, Svetlana and Holclajtner-Antunović, Ivanka and Uskoković-Marković, Snežana and Bajuk-Bogdanović, Danica and Pavlović, Vladimir and Tosić, Dragana and Milenković, Marina and Todorović-Marković, Biljana",
year = "2018",
abstract = "Antibacterial properties of graphene oxide (GO) have been studied extensively in the last few years, while for polyoxometalates there are just a few researches. Herein, we prepared nanocomposites of GO and different amounts of 12-molybdophosphoric acid (MoPA) and analyzed their antibacterial activity and both structural and morphological properties. In nanocomposites with higher amounts of MoPA, graphene sheets were significantly changed with disrupted flat, graphene-like morphology of GO. In the nanocomposites with low MoPA content, flat GO morphology was preserved. Additionally, structural analyses showed some changes in symmetry of the Keggin anion as a consequence of interactions between GO and MoPA, the increase in structural disorder and the lowering of electron density in GO structure due to interaction with MoPA. We have studied antibacterial properties on the gram-positive: Staphylococcus aureus, Staphylococcus epidermidis, Bacillus subtilis; and the gram-negative bacteria: Escherichia coil, Klebsiella pneumoniae, Pseudomonas aeruginosa and Salmonella abony. Only a mild antibacterial effect of GO and nanocomposites with low amount of MoPA against Bacillus subtilis was observed, while the rest of analyzed materials did not show any antibacterial activity.",
publisher = "Elsevier Science Sa, Lausanne",
journal = "Materials Chemistry and Physics",
title = "Modification of graphene oxide surfaces with 12-molybdophosphoric acid: Structural and antibacterial study",
volume = "213",
pages = "157-167",
doi = "10.1016/j.matchemphys.2018.04.011"
}

Jovanović, S., Holclajtner-Antunović, I., Uskoković-Marković, S., Bajuk-Bogdanović, D., Pavlović, V., Tosić, D., Milenković, M.,& Todorović-Marković, B.. (2018). Modification of graphene oxide surfaces with 12-molybdophosphoric acid: Structural and antibacterial study. in Materials Chemistry and Physics
Elsevier Science Sa, Lausanne., 213, 157-167.
https://doi.org/10.1016/j.matchemphys.2018.04.011

Jovanović S, Holclajtner-Antunović I, Uskoković-Marković S, Bajuk-Bogdanović D, Pavlović V, Tosić D, Milenković M, Todorović-Marković B. Modification of graphene oxide surfaces with 12-molybdophosphoric acid: Structural and antibacterial study. in Materials Chemistry and Physics. 2018;213:157-167.
doi:10.1016/j.matchemphys.2018.04.011 .

Jovanović, Svetlana, Holclajtner-Antunović, Ivanka, Uskoković-Marković, Snežana, Bajuk-Bogdanović, Danica, Pavlović, Vladimir, Tosić, Dragana, Milenković, Marina, Todorović-Marković, Biljana, "Modification of graphene oxide surfaces with 12-molybdophosphoric acid: Structural and antibacterial study" in Materials Chemistry and Physics, 213 (2018):157-167,
https://doi.org/10.1016/j.matchemphys.2018.04.011 . .

TY  - JOUR
AU  - Marić-Stojanović, M.
AU  - Bajuk-Bogdanović, Danica
AU  - Uskoković-Marković, Snežana
AU  - Holclajtner-Antunović, Ivanka
PY  - 2018
UR  - https://farfar.pharmacy.bg.ac.rs/handle/123456789/3205
AB  - The Church of the Holy Mother of God Hodegetria in Pec is decorated with wall paintings that date from the beginning of the 14th century. In terms of style they correspond to Byzantine wall paintings from the epoch of Paleologos. The painting technique and pigment pallete has been examined on micro fragments in thin cross sections by means of optical microscopy (OM), scanning electron microscopy-energy dispersive X-ray spectroscopy (SEM-EDS) and micro-Raman spectroscopy. Use of the fresco technique and two supporting plaster layers was noted on the majority of samples, while in large blue painted areas, a combination of fresco and secco techniques was used. The SEM-EDS results showed the presence of Ca as the main component of plaster besides the traces of Si and Mg. In some samples egg white as a binder was identified. The paint film is often multilayered. Twelve pigments were identified, mainly natural earth pigments such as red ochre, yellow ochre and green earth. A mixture of pigments was used for attaining desirable optical and aesthetical impressions. As decay product only weddelite was detected in many preparatory and painted samples.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - Spectroscopy Letters
T1  - Spectroscopic analysis of XIV century wall paintings from Patriarchate of Pec Monastery, Serbia
VL  - 191
SP  - 469
EP  - 477
DO  - 10.1016/j.saa.2017.10.043
ER  - 

@article{
author = "Marić-Stojanović, M. and Bajuk-Bogdanović, Danica and Uskoković-Marković, Snežana and Holclajtner-Antunović, Ivanka",
year = "2018",
abstract = "The Church of the Holy Mother of God Hodegetria in Pec is decorated with wall paintings that date from the beginning of the 14th century. In terms of style they correspond to Byzantine wall paintings from the epoch of Paleologos. The painting technique and pigment pallete has been examined on micro fragments in thin cross sections by means of optical microscopy (OM), scanning electron microscopy-energy dispersive X-ray spectroscopy (SEM-EDS) and micro-Raman spectroscopy. Use of the fresco technique and two supporting plaster layers was noted on the majority of samples, while in large blue painted areas, a combination of fresco and secco techniques was used. The SEM-EDS results showed the presence of Ca as the main component of plaster besides the traces of Si and Mg. In some samples egg white as a binder was identified. The paint film is often multilayered. Twelve pigments were identified, mainly natural earth pigments such as red ochre, yellow ochre and green earth. A mixture of pigments was used for attaining desirable optical and aesthetical impressions. As decay product only weddelite was detected in many preparatory and painted samples.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "Spectroscopy Letters",
title = "Spectroscopic analysis of XIV century wall paintings from Patriarchate of Pec Monastery, Serbia",
volume = "191",
pages = "469-477",
doi = "10.1016/j.saa.2017.10.043"
}

Marić-Stojanović, M., Bajuk-Bogdanović, D., Uskoković-Marković, S.,& Holclajtner-Antunović, I.. (2018). Spectroscopic analysis of XIV century wall paintings from Patriarchate of Pec Monastery, Serbia. in Spectroscopy Letters
Pergamon-Elsevier Science Ltd, Oxford., 191, 469-477.
https://doi.org/10.1016/j.saa.2017.10.043

Marić-Stojanović M, Bajuk-Bogdanović D, Uskoković-Marković S, Holclajtner-Antunović I. Spectroscopic analysis of XIV century wall paintings from Patriarchate of Pec Monastery, Serbia. in Spectroscopy Letters. 2018;191:469-477.
doi:10.1016/j.saa.2017.10.043 .

Marić-Stojanović, M., Bajuk-Bogdanović, Danica, Uskoković-Marković, Snežana, Holclajtner-Antunović, Ivanka, "Spectroscopic analysis of XIV century wall paintings from Patriarchate of Pec Monastery, Serbia" in Spectroscopy Letters, 191 (2018):469-477,
https://doi.org/10.1016/j.saa.2017.10.043 . .

TY  - JOUR
AU  - Jović, A.
AU  - Bajuk-Bogdanović, Danica
AU  - Nedić-Vasiljević, Bojana
AU  - Milojević-Rakić, Maja
AU  - Krajišnik, Danina
AU  - Dondur, Vera
AU  - Popa, Alexandru
AU  - Uskoković-Marković, Snežana
AU  - Holclajtner-Antunović, Ivanka
PY  - 2017
UR  - https://farfar.pharmacy.bg.ac.rs/handle/123456789/2932
AB  - An optimized synthetic route for obtaining heteropoly acid (HPA) species supported on BEA zeolite was applied, and different samples, comprising 20 to 50 wt% of 12-phosphotungstic acid (HPW) were prepared. The as-synthesized supported HPW were subjected to different post-synthesis routes, which involved calcination and ultrasound treatment. Characterization of these materials was performed by means of Scanning Electron Microscopy, zeta potential measurements, Infrared Spectroscopy and X-ray Powder Diffraction analysis. Results suggest strong interaction of HPW with the support and revealed that ultrasound treatment resulted in better dispersion of active phase and thus homogeneous morphology of the samples. The zeta potential was found to be dependent on the preparation procedure and HPW content in these materials, while higher HPW loadings induced its agglomeration. Catalytic activity of the synthesized materials was investigated in an ethanol dehydration reaction, where lower HPW loadings induced higher ethanol conversion. Acid sites distribution and accessibility for ethanol molecules were found to be more essential for catalytic activity than HPW loadings, i.e., amount of active sites present in these hybrid materials.
PB  - Elsevier Science Sa, Lausanne
T2  - Materials Chemistry and Physics
T1  - Synthesis and characterization of 12-phosphotungstic acid supported on BEA zeolite
VL  - 186
SP  - 430
EP  - 437
DO  - 10.1016/j.matchemphys.2016.11.015
ER  - 

@article{
author = "Jović, A. and Bajuk-Bogdanović, Danica and Nedić-Vasiljević, Bojana and Milojević-Rakić, Maja and Krajišnik, Danina and Dondur, Vera and Popa, Alexandru and Uskoković-Marković, Snežana and Holclajtner-Antunović, Ivanka",
year = "2017",
abstract = "An optimized synthetic route for obtaining heteropoly acid (HPA) species supported on BEA zeolite was applied, and different samples, comprising 20 to 50 wt% of 12-phosphotungstic acid (HPW) were prepared. The as-synthesized supported HPW were subjected to different post-synthesis routes, which involved calcination and ultrasound treatment. Characterization of these materials was performed by means of Scanning Electron Microscopy, zeta potential measurements, Infrared Spectroscopy and X-ray Powder Diffraction analysis. Results suggest strong interaction of HPW with the support and revealed that ultrasound treatment resulted in better dispersion of active phase and thus homogeneous morphology of the samples. The zeta potential was found to be dependent on the preparation procedure and HPW content in these materials, while higher HPW loadings induced its agglomeration. Catalytic activity of the synthesized materials was investigated in an ethanol dehydration reaction, where lower HPW loadings induced higher ethanol conversion. Acid sites distribution and accessibility for ethanol molecules were found to be more essential for catalytic activity than HPW loadings, i.e., amount of active sites present in these hybrid materials.",
publisher = "Elsevier Science Sa, Lausanne",
journal = "Materials Chemistry and Physics",
title = "Synthesis and characterization of 12-phosphotungstic acid supported on BEA zeolite",
volume = "186",
pages = "430-437",
doi = "10.1016/j.matchemphys.2016.11.015"
}

Jović, A., Bajuk-Bogdanović, D., Nedić-Vasiljević, B., Milojević-Rakić, M., Krajišnik, D., Dondur, V., Popa, A., Uskoković-Marković, S.,& Holclajtner-Antunović, I.. (2017). Synthesis and characterization of 12-phosphotungstic acid supported on BEA zeolite. in Materials Chemistry and Physics
Elsevier Science Sa, Lausanne., 186, 430-437.
https://doi.org/10.1016/j.matchemphys.2016.11.015

Jović A, Bajuk-Bogdanović D, Nedić-Vasiljević B, Milojević-Rakić M, Krajišnik D, Dondur V, Popa A, Uskoković-Marković S, Holclajtner-Antunović I. Synthesis and characterization of 12-phosphotungstic acid supported on BEA zeolite. in Materials Chemistry and Physics. 2017;186:430-437.
doi:10.1016/j.matchemphys.2016.11.015 .

Jović, A., Bajuk-Bogdanović, Danica, Nedić-Vasiljević, Bojana, Milojević-Rakić, Maja, Krajišnik, Danina, Dondur, Vera, Popa, Alexandru, Uskoković-Marković, Snežana, Holclajtner-Antunović, Ivanka, "Synthesis and characterization of 12-phosphotungstic acid supported on BEA zeolite" in Materials Chemistry and Physics, 186 (2017):430-437,
https://doi.org/10.1016/j.matchemphys.2016.11.015 . .