TY  - JOUR
AU  - Filipović, Nenad
AU  - Veselinovic, Ljiljana
AU  - Ražić, Slavica
AU  - Jeremić, Sanja
AU  - Filipić, Metka
AU  - Zegura, Bojana
AU  - Tomic, Sergej
AU  - Čolić, Miodrag
AU  - Stevanović, Magdalena
PY  - 2019
UR  - https://farfar.pharmacy.bg.ac.rs/handle/123456789/3328
AB  - Poly (e-caprolactone) (PCL) microspheres as a carrier for sustained release of antibacterial agent, selenium nanoparticles (SeNPs), were developed. The obtained PCL/SeNPs microspheres were in the range 1-4 mu m with the encapsulation efficiency of about 90%. The degradation process and release behavior of SeNPs from PCL microspheres were investigated in five different degradation media: phosphate buffer solution (PBS), a solution of lipase isolated from the porcine pancreas in PBS, 0.1 M hydrochloric acid (HCl), Pseudomonas aeruginosa PAO1 cell-free extract in PBS and implant fluid (exudate) from the subcutaneously implanted sterile polyvinyl sponges which induce a foreign-body inflammatory reaction. The samples were thoroughly characterized by SEM, TEM, FTIR, XRD, PSA, DSC, confocal microscopy, and ICP-OES techniques. Under physiological conditions at neutral pH, a very slow release of SeNPs occurred (3 and 8% in the case of PBS or PBS + lipase, respectively and after 660 days), while in the acidic environment their presence was not detected. On the other hand, the release in the medium with bacterial extract was much more pronounced, even after 24 h (13%). After 7 days, the concentration of SeNPs reached a maximum of around 30%. Also, 37% of SeNPs have been released after 11 days of incubation of PCL/SeNPs in the implant exudate. These results suggest that the release of SeNPs from PCL was triggered by Pseudomonas aeruginosa PAO1 bacterium as well as by foreign body inflammatory reaction to implant. Furthermore, PCL/SeNPs microspheres were investigated in terms of their biocompatibility. For this purpose, cytotoxicity, the formation of reactive oxygen species (ROS), and genotoxicity were evaluated on HepG2 cell line. The interaction of PCL/SeNPs with phagocytic cell line (Raw 264.7 macrophages) was monitored as well. It was found that the microspheres in investigated concentration range had no acute cytotoxic effects. Finally, SeNPs, as well as PCL/SeNPs, showed a considerable antibacterial activity against Gram-positive bacteria: Staphylococcus aureus (ATCC 25923) and Staphylococcus epidermidis (ATCC 1228). These results suggest that PCL/SeNPs-based system could be an attractive platform for a prolonged prevention of infections accompanying implants.
PB  - Elsevier Science BV, Amsterdam
T2  - Materials Science & Engineering C: Materials for Biological Applications
T1  - Poly (epsilon-caprolactone) microspheres for prolonged release of selenium nanoparticles
VL  - 96
SP  - 776
EP  - 789
DO  - 10.1016/j.msec.2018.11.073
ER  - 

@article{
author = "Filipović, Nenad and Veselinovic, Ljiljana and Ražić, Slavica and Jeremić, Sanja and Filipić, Metka and Zegura, Bojana and Tomic, Sergej and Čolić, Miodrag and Stevanović, Magdalena",
year = "2019",
abstract = "Poly (e-caprolactone) (PCL) microspheres as a carrier for sustained release of antibacterial agent, selenium nanoparticles (SeNPs), were developed. The obtained PCL/SeNPs microspheres were in the range 1-4 mu m with the encapsulation efficiency of about 90%. The degradation process and release behavior of SeNPs from PCL microspheres were investigated in five different degradation media: phosphate buffer solution (PBS), a solution of lipase isolated from the porcine pancreas in PBS, 0.1 M hydrochloric acid (HCl), Pseudomonas aeruginosa PAO1 cell-free extract in PBS and implant fluid (exudate) from the subcutaneously implanted sterile polyvinyl sponges which induce a foreign-body inflammatory reaction. The samples were thoroughly characterized by SEM, TEM, FTIR, XRD, PSA, DSC, confocal microscopy, and ICP-OES techniques. Under physiological conditions at neutral pH, a very slow release of SeNPs occurred (3 and 8% in the case of PBS or PBS + lipase, respectively and after 660 days), while in the acidic environment their presence was not detected. On the other hand, the release in the medium with bacterial extract was much more pronounced, even after 24 h (13%). After 7 days, the concentration of SeNPs reached a maximum of around 30%. Also, 37% of SeNPs have been released after 11 days of incubation of PCL/SeNPs in the implant exudate. These results suggest that the release of SeNPs from PCL was triggered by Pseudomonas aeruginosa PAO1 bacterium as well as by foreign body inflammatory reaction to implant. Furthermore, PCL/SeNPs microspheres were investigated in terms of their biocompatibility. For this purpose, cytotoxicity, the formation of reactive oxygen species (ROS), and genotoxicity were evaluated on HepG2 cell line. The interaction of PCL/SeNPs with phagocytic cell line (Raw 264.7 macrophages) was monitored as well. It was found that the microspheres in investigated concentration range had no acute cytotoxic effects. Finally, SeNPs, as well as PCL/SeNPs, showed a considerable antibacterial activity against Gram-positive bacteria: Staphylococcus aureus (ATCC 25923) and Staphylococcus epidermidis (ATCC 1228). These results suggest that PCL/SeNPs-based system could be an attractive platform for a prolonged prevention of infections accompanying implants.",
publisher = "Elsevier Science BV, Amsterdam",
journal = "Materials Science & Engineering C: Materials for Biological Applications",
title = "Poly (epsilon-caprolactone) microspheres for prolonged release of selenium nanoparticles",
volume = "96",
pages = "776-789",
doi = "10.1016/j.msec.2018.11.073"
}

Filipović, N., Veselinovic, L., Ražić, S., Jeremić, S., Filipić, M., Zegura, B., Tomic, S., Čolić, M.,& Stevanović, M.. (2019). Poly (epsilon-caprolactone) microspheres for prolonged release of selenium nanoparticles. in Materials Science & Engineering C: Materials for Biological Applications
Elsevier Science BV, Amsterdam., 96, 776-789.
https://doi.org/10.1016/j.msec.2018.11.073

Filipović N, Veselinovic L, Ražić S, Jeremić S, Filipić M, Zegura B, Tomic S, Čolić M, Stevanović M. Poly (epsilon-caprolactone) microspheres for prolonged release of selenium nanoparticles. in Materials Science & Engineering C: Materials for Biological Applications. 2019;96:776-789.
doi:10.1016/j.msec.2018.11.073 .

Filipović, Nenad, Veselinovic, Ljiljana, Ražić, Slavica, Jeremić, Sanja, Filipić, Metka, Zegura, Bojana, Tomic, Sergej, Čolić, Miodrag, Stevanović, Magdalena, "Poly (epsilon-caprolactone) microspheres for prolonged release of selenium nanoparticles" in Materials Science & Engineering C: Materials for Biological Applications, 96 (2019):776-789,
https://doi.org/10.1016/j.msec.2018.11.073 . .

TY  - THES
AU  - Dinić, Miroslav
PY  - 2018
UR  - http://eteze.bg.ac.rs/application/showtheses?thesesId=6030
UR  - http://nardus.mpn.gov.rs/handle/123456789/9986
UR  - https://fedorabg.bg.ac.rs/fedora/get/o:18343/bdef:Content/download
UR  - http://vbs.rs/scripts/cobiss?command=DISPLAY&base=70036&RID=2048264546
UR  - https://farfar.pharmacy.bg.ac.rs/handle/123456789/3680
AB  - Izolacija i karakterizacija bakterijskih biomolekula koji interaguju sa receptorimaćelija domaćina predstavlja kljuĉ za razumevanje mehanizama probiotiĉkog dejstvalaktobacila. Savremena istraţivanja probiotiĉkih bakterija usmerena su ka identifikacijibiomolekula koji mogu modulisati razliĉite signalne puteve u humanim ćelijama. Svimolekuli koji su poreklom iz probiotika i odgovorni su za njihov pozitivan efekat nazdravlje domaćina nazvani su postbiotici. Zbog slabijeg imunostimulišućeg potencijala,njihova primena predstavlja bezbednu alternativu primeni ţivih bakterija.Ovo istraţivanje je imalo za cilj da testira mogućnost primene postbiotika uublaţavanju simptoma bola i neţeljenih efekata koji nastaju kao posledica primeneanalgetika. Taĉnije, definisana su dva specifiĉna cilja istraţivanja: (i) ispitati uticajbioaktivnih molekula odabranih sojeva laktobacila na proces autofagije u hepatocitima invitro, kao i protektivan efekat ovih molekula kod toksiĉnosti izazvane paracetamolom i (ii)ispitati potencijalni imunomodulatorni efekat egzopolisaharida (EPS-CG11) izolovanog izsoja Lactobacillus paraplantarum BGCG11, u in vivo eksperimentalnim modelimainflamacije. Eksperimenti u kulturi hepatocita ukljuĉili su praćenje stepena oštećenjaHepG2 ćelija izloţenih toksiĉnoj koncentraciji paracetamola i procesa autofagije, sa ciljemidentifikacije potencijalnog mehanizma delovanja postbiotika. Metodološki, vijabilnostHepG2 ćelija analizirana je MTT i LDH esejima. Autofagija je praćena Western blotanalizom odreĊivanjem ekspresije p62/SQSTM1 proteina i akumulacijom liposolubilneforme LC3 proteina. Dodatno, autofagija je analizirana praćenjem ekspresije BECN1, Atg5,p62/SQSTM1 i PINK1 gena i autofagnog fluksa. Za analizu imunomodulatornog efektaEPS-CG11 korišćena su dva in vivo modela inflamacije izazvane karageninom: modelinflamatornog bola i model peritonitisa kod pacova Wistar soja. U eksperimentuinflamatornog bola praćeni su: vremenski tok razvoja hiperalgezije i edema šapica nakonprofilaktiĉke sistemske primene EPS-CG11, ekspresija medijatora inflamacije (IL-1β,TNF-α, IL-6 i iNOS), infiltracija neutrofila (ekspresija MPO enzima) i aktivacija/infiltracijamonocita (ekspresija CD14 markera)...
AB  - Isolation and characterization of bacterial biomolecules involved in the interactionwith the receptors of the host cells represent the key factor for understanding themechanisms of probiotic action of lactobacilli. Novel studies regarding probiotic bacteriahave been focused on the identification of biomolecules which can modulate differentsignaling pathways in human cells. All molecules that originate from probiotics which areresponsible for its positive effects on the host’s health are called postbiotics. Theirapplication represents the safe alternative to the use of live bacteria and itsimmunostimulating potential.This research aimed to test the possibility of using postbiotics in alleviation of painsymptoms and analgesics side effects. More precisely, two main objectives of this researchwere: (i) to examine the influence of bioactive molecules of selected strains of lactobacillion the autophagy process in the hepatocytes, in vitro, as well as protective effect of thesemolecules in paracetamol-induced toxicity and (ii) to examine the potentialimmunomodulatory effect of exopolysaccharide (EPS-CG11) isolated from Lactobacillusparaplantarum BGCG11 strain, in in vivo experimental models of inflammation.Experiments in the hepatocytes culture included monitoring the degree of damage ofHepG2 cells exposed to the toxic paracetamol concentration and the autophagy process,with the aim of identification of potential mechanism of postbiotic action.Methodologically, the cell viability was monitored by MTT and LDH assays. Autophagywas monitored by Western blot analysis, in order to determine the expression of thep62/SQSTM1 protein and the accumulation of the liposoluble form of the LC3 protein.Further, the autophagy was analyzed by monitoring the expression of BECN1, Atg5,p62/SQSTM1 and PINK1 genes and the autophagy flux. For the analysis of theimmunomodulatory effect of EPS-CG11, two in vivo models of carrageenan-inducedinflammation were used: an inflammatory pain model and a peritonitis model in the Wistarrats...
PB  - Универзитет у Београду, Фармацеутски факултет
T2  - Универзитет у Београду
T1  - Uticaj bioaktivnih molekula laktobacila na procese autofagije i inflamacije u in vitro i in vivo sistemima
UR  - https://hdl.handle.net/21.15107/rcub_nardus_9986
ER  - 

@phdthesis{
author = "Dinić, Miroslav",
year = "2018",
abstract = "Izolacija i karakterizacija bakterijskih biomolekula koji interaguju sa receptorimaćelija domaćina predstavlja kljuĉ za razumevanje mehanizama probiotiĉkog dejstvalaktobacila. Savremena istraţivanja probiotiĉkih bakterija usmerena su ka identifikacijibiomolekula koji mogu modulisati razliĉite signalne puteve u humanim ćelijama. Svimolekuli koji su poreklom iz probiotika i odgovorni su za njihov pozitivan efekat nazdravlje domaćina nazvani su postbiotici. Zbog slabijeg imunostimulišućeg potencijala,njihova primena predstavlja bezbednu alternativu primeni ţivih bakterija.Ovo istraţivanje je imalo za cilj da testira mogućnost primene postbiotika uublaţavanju simptoma bola i neţeljenih efekata koji nastaju kao posledica primeneanalgetika. Taĉnije, definisana su dva specifiĉna cilja istraţivanja: (i) ispitati uticajbioaktivnih molekula odabranih sojeva laktobacila na proces autofagije u hepatocitima invitro, kao i protektivan efekat ovih molekula kod toksiĉnosti izazvane paracetamolom i (ii)ispitati potencijalni imunomodulatorni efekat egzopolisaharida (EPS-CG11) izolovanog izsoja Lactobacillus paraplantarum BGCG11, u in vivo eksperimentalnim modelimainflamacije. Eksperimenti u kulturi hepatocita ukljuĉili su praćenje stepena oštećenjaHepG2 ćelija izloţenih toksiĉnoj koncentraciji paracetamola i procesa autofagije, sa ciljemidentifikacije potencijalnog mehanizma delovanja postbiotika. Metodološki, vijabilnostHepG2 ćelija analizirana je MTT i LDH esejima. Autofagija je praćena Western blotanalizom odreĊivanjem ekspresije p62/SQSTM1 proteina i akumulacijom liposolubilneforme LC3 proteina. Dodatno, autofagija je analizirana praćenjem ekspresije BECN1, Atg5,p62/SQSTM1 i PINK1 gena i autofagnog fluksa. Za analizu imunomodulatornog efektaEPS-CG11 korišćena su dva in vivo modela inflamacije izazvane karageninom: modelinflamatornog bola i model peritonitisa kod pacova Wistar soja. U eksperimentuinflamatornog bola praćeni su: vremenski tok razvoja hiperalgezije i edema šapica nakonprofilaktiĉke sistemske primene EPS-CG11, ekspresija medijatora inflamacije (IL-1β,TNF-α, IL-6 i iNOS), infiltracija neutrofila (ekspresija MPO enzima) i aktivacija/infiltracijamonocita (ekspresija CD14 markera)..., Isolation and characterization of bacterial biomolecules involved in the interactionwith the receptors of the host cells represent the key factor for understanding themechanisms of probiotic action of lactobacilli. Novel studies regarding probiotic bacteriahave been focused on the identification of biomolecules which can modulate differentsignaling pathways in human cells. All molecules that originate from probiotics which areresponsible for its positive effects on the host’s health are called postbiotics. Theirapplication represents the safe alternative to the use of live bacteria and itsimmunostimulating potential.This research aimed to test the possibility of using postbiotics in alleviation of painsymptoms and analgesics side effects. More precisely, two main objectives of this researchwere: (i) to examine the influence of bioactive molecules of selected strains of lactobacillion the autophagy process in the hepatocytes, in vitro, as well as protective effect of thesemolecules in paracetamol-induced toxicity and (ii) to examine the potentialimmunomodulatory effect of exopolysaccharide (EPS-CG11) isolated from Lactobacillusparaplantarum BGCG11 strain, in in vivo experimental models of inflammation.Experiments in the hepatocytes culture included monitoring the degree of damage ofHepG2 cells exposed to the toxic paracetamol concentration and the autophagy process,with the aim of identification of potential mechanism of postbiotic action.Methodologically, the cell viability was monitored by MTT and LDH assays. Autophagywas monitored by Western blot analysis, in order to determine the expression of thep62/SQSTM1 protein and the accumulation of the liposoluble form of the LC3 protein.Further, the autophagy was analyzed by monitoring the expression of BECN1, Atg5,p62/SQSTM1 and PINK1 genes and the autophagy flux. For the analysis of theimmunomodulatory effect of EPS-CG11, two in vivo models of carrageenan-inducedinflammation were used: an inflammatory pain model and a peritonitis model in the Wistarrats...",
publisher = "Универзитет у Београду, Фармацеутски факултет",
journal = "Универзитет у Београду",
title = "Uticaj bioaktivnih molekula laktobacila na procese autofagije i inflamacije u in vitro i in vivo sistemima",
url = "https://hdl.handle.net/21.15107/rcub_nardus_9986"
}

Dinić, M.. (2018). Uticaj bioaktivnih molekula laktobacila na procese autofagije i inflamacije u in vitro i in vivo sistemima. in Универзитет у Београду
Универзитет у Београду, Фармацеутски факултет..
https://hdl.handle.net/21.15107/rcub_nardus_9986

Dinić M. Uticaj bioaktivnih molekula laktobacila na procese autofagije i inflamacije u in vitro i in vivo sistemima. in Универзитет у Београду. 2018;.
https://hdl.handle.net/21.15107/rcub_nardus_9986 .

Dinić, Miroslav, "Uticaj bioaktivnih molekula laktobacila na procese autofagije i inflamacije u in vitro i in vivo sistemima" in Универзитет у Београду (2018),
https://hdl.handle.net/21.15107/rcub_nardus_9986 .

TY  - JOUR
AU  - Stanković, Ana
AU  - Sezen, Meltem
AU  - Milenković, Marina
AU  - Kaisarević, Sonja
AU  - Andrić, Nebojša
AU  - Stevanović, Magdalena
PY  - 2016
UR  - https://farfar.pharmacy.bg.ac.rs/handle/123456789/2673
AB  - Copolymer poly (DL-lactide-co-glycolide) (PLGA) is extensively investigated for various biomedical applications such as controlled drug delivery or carriers in the tissue engineering. In addition, zinc oxide (ZnO) is widely used in biomedicine especially for materials like dental composites, as a constituent of creams for the treatment of a variety of skin irritations, to enhance the antibacterial activity of different medicaments and so on. Uniform, spherical ZnO nanoparticles (nano-ZnO) have been synthesized via microwave synthesis method. In addition to obtaining nano-ZnO, a further aim was to examine their immobilization in the PLGA polymer matrix (PLGA/nano-ZnO) and this was done by a simple physicochemical solvent/nonsolvent method. The samples were characterized by X-ray diffraction, scanning electron microscopy, laser diffraction particle size analyzer, differential thermal analysis, and thermal gravimetric analysis. The synthesized PLGA/nano-ZnO particles are spherical, uniform, and with diameters below 1 mu m. The influence of the different solvents and the drying methods during the synthesis was investigated too. The biocompatibility of the samples is discussed in terms of in vitro toxicity on human hepatoma HepG2 cells by application of MTT assay and the antimicrobial activity was evaluated by broth microdilution method against different groups of microorganisms (Gram-positive bacteria, Gram-negative bacteria, and yeast Candida albicans).
PB  - Hindawi Ltd, London
T2  - Journal of Nanomaterials
T1  - PLGA/Nano-ZnO Composite Particles for Use in Biomedical Applications: Preparation, Characterization, and Antimicrobial Activity
DO  - 10.1155/2016/9425289
ER  - 

@article{
author = "Stanković, Ana and Sezen, Meltem and Milenković, Marina and Kaisarević, Sonja and Andrić, Nebojša and Stevanović, Magdalena",
year = "2016",
abstract = "Copolymer poly (DL-lactide-co-glycolide) (PLGA) is extensively investigated for various biomedical applications such as controlled drug delivery or carriers in the tissue engineering. In addition, zinc oxide (ZnO) is widely used in biomedicine especially for materials like dental composites, as a constituent of creams for the treatment of a variety of skin irritations, to enhance the antibacterial activity of different medicaments and so on. Uniform, spherical ZnO nanoparticles (nano-ZnO) have been synthesized via microwave synthesis method. In addition to obtaining nano-ZnO, a further aim was to examine their immobilization in the PLGA polymer matrix (PLGA/nano-ZnO) and this was done by a simple physicochemical solvent/nonsolvent method. The samples were characterized by X-ray diffraction, scanning electron microscopy, laser diffraction particle size analyzer, differential thermal analysis, and thermal gravimetric analysis. The synthesized PLGA/nano-ZnO particles are spherical, uniform, and with diameters below 1 mu m. The influence of the different solvents and the drying methods during the synthesis was investigated too. The biocompatibility of the samples is discussed in terms of in vitro toxicity on human hepatoma HepG2 cells by application of MTT assay and the antimicrobial activity was evaluated by broth microdilution method against different groups of microorganisms (Gram-positive bacteria, Gram-negative bacteria, and yeast Candida albicans).",
publisher = "Hindawi Ltd, London",
journal = "Journal of Nanomaterials",
title = "PLGA/Nano-ZnO Composite Particles for Use in Biomedical Applications: Preparation, Characterization, and Antimicrobial Activity",
doi = "10.1155/2016/9425289"
}

Stanković, A., Sezen, M., Milenković, M., Kaisarević, S., Andrić, N.,& Stevanović, M.. (2016). PLGA/Nano-ZnO Composite Particles for Use in Biomedical Applications: Preparation, Characterization, and Antimicrobial Activity. in Journal of Nanomaterials
Hindawi Ltd, London..
https://doi.org/10.1155/2016/9425289

Stanković A, Sezen M, Milenković M, Kaisarević S, Andrić N, Stevanović M. PLGA/Nano-ZnO Composite Particles for Use in Biomedical Applications: Preparation, Characterization, and Antimicrobial Activity. in Journal of Nanomaterials. 2016;.
doi:10.1155/2016/9425289 .

Stanković, Ana, Sezen, Meltem, Milenković, Marina, Kaisarević, Sonja, Andrić, Nebojša, Stevanović, Magdalena, "PLGA/Nano-ZnO Composite Particles for Use in Biomedical Applications: Preparation, Characterization, and Antimicrobial Activity" in Journal of Nanomaterials (2016),
https://doi.org/10.1155/2016/9425289 . .

TY  - JOUR
AU  - Stevanović, Magdalena
AU  - Bracko, Ines
AU  - Milenković, Marina
AU  - Filipović, Nenad
AU  - Nunić, Jana
AU  - Filipić, Metka
AU  - Uskoković, Dragan P.
PY  - 2014
UR  - https://farfar.pharmacy.bg.ac.rs/handle/123456789/2184
AB  - A water-soluble antioxidant (ascorbic acid, vitamin C) was encapsulated together with poly(L-glutamic acid)-capped silver nanoparticles (AgNpPGA) within a poly(lactide-co-glycolide) (PLGA) polymeric matrix and their synergistic effects were studied. The PLGA/AgNpPGA/ascorbic acid particles synthesized by a physicochemical method with solvent/non-solvent systems are spherical, have a mean diameter of 775 nm and a narrow size distribution with a polydispersity index of 0.158. The encapsulation efficiency of AgNpPGA/ascorbic acid within PLGA was determined to be >90%. The entire amount of encapsulated ascorbic acid was released in 68 days, and the entire amount of AgNpPGAs was released in 87 days of degradation. The influence of PLGA/AgNpPGA/ascorbic acid on cell viability, generation of reactive oxygen species (ROS) in HepG2 cells, as well as antimicrobial activity against seven different pathogens was investigated. The 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide assay indicated good biocompatibility of these PLGA/AgNpPGA/ascorbic acid particles. We measured the kinetics of ROS formation in HepG2 cells by a DCFH-DA assay, and found that PLGA/AgNpPGA/ascorbic acid caused a significant decrease in DCF fluorescence intensity, which was 2-fold lower than that in control cells after a 5 h exposure. This indicates that the PLGA/AgNpPGA/ascorbic acid microspheres either act as scavengers of intracellular ROS and/or reduce their formation. Also, the results of antimicrobial activity of PLGA/AgNpPGA/ascorbic acid obtained by the broth microdilution method showed superior and extended activity of these particles. The samples were characterized using Fourier transform infrared spectroscopy, field-emission scanning electron microscopy, transmission electron microscopy, zeta potential and particle size analysis. This paper presents a new approach to the treatment of infection that at the same time offers a very pronounced antioxidant effect.
PB  - Elsevier Sci Ltd, Oxford
T2  - Acta Biomaterialia
T1  - Multifunctional PLGA particles containing poly(L-glutamic acid)-capped silver nanoparticles and ascorbic acid with simultaneous antioxidative and prolonged antimicrobial activity
VL  - 10
IS  - 1
SP  - 151
EP  - 162
DO  - 10.1016/j.actbio.2013.08.030
ER  - 

@article{
author = "Stevanović, Magdalena and Bracko, Ines and Milenković, Marina and Filipović, Nenad and Nunić, Jana and Filipić, Metka and Uskoković, Dragan P.",
year = "2014",
abstract = "A water-soluble antioxidant (ascorbic acid, vitamin C) was encapsulated together with poly(L-glutamic acid)-capped silver nanoparticles (AgNpPGA) within a poly(lactide-co-glycolide) (PLGA) polymeric matrix and their synergistic effects were studied. The PLGA/AgNpPGA/ascorbic acid particles synthesized by a physicochemical method with solvent/non-solvent systems are spherical, have a mean diameter of 775 nm and a narrow size distribution with a polydispersity index of 0.158. The encapsulation efficiency of AgNpPGA/ascorbic acid within PLGA was determined to be >90%. The entire amount of encapsulated ascorbic acid was released in 68 days, and the entire amount of AgNpPGAs was released in 87 days of degradation. The influence of PLGA/AgNpPGA/ascorbic acid on cell viability, generation of reactive oxygen species (ROS) in HepG2 cells, as well as antimicrobial activity against seven different pathogens was investigated. The 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide assay indicated good biocompatibility of these PLGA/AgNpPGA/ascorbic acid particles. We measured the kinetics of ROS formation in HepG2 cells by a DCFH-DA assay, and found that PLGA/AgNpPGA/ascorbic acid caused a significant decrease in DCF fluorescence intensity, which was 2-fold lower than that in control cells after a 5 h exposure. This indicates that the PLGA/AgNpPGA/ascorbic acid microspheres either act as scavengers of intracellular ROS and/or reduce their formation. Also, the results of antimicrobial activity of PLGA/AgNpPGA/ascorbic acid obtained by the broth microdilution method showed superior and extended activity of these particles. The samples were characterized using Fourier transform infrared spectroscopy, field-emission scanning electron microscopy, transmission electron microscopy, zeta potential and particle size analysis. This paper presents a new approach to the treatment of infection that at the same time offers a very pronounced antioxidant effect.",
publisher = "Elsevier Sci Ltd, Oxford",
journal = "Acta Biomaterialia",
title = "Multifunctional PLGA particles containing poly(L-glutamic acid)-capped silver nanoparticles and ascorbic acid with simultaneous antioxidative and prolonged antimicrobial activity",
volume = "10",
number = "1",
pages = "151-162",
doi = "10.1016/j.actbio.2013.08.030"
}

Stevanović, M., Bracko, I., Milenković, M., Filipović, N., Nunić, J., Filipić, M.,& Uskoković, D. P.. (2014). Multifunctional PLGA particles containing poly(L-glutamic acid)-capped silver nanoparticles and ascorbic acid with simultaneous antioxidative and prolonged antimicrobial activity. in Acta Biomaterialia
Elsevier Sci Ltd, Oxford., 10(1), 151-162.
https://doi.org/10.1016/j.actbio.2013.08.030

Stevanović M, Bracko I, Milenković M, Filipović N, Nunić J, Filipić M, Uskoković DP. Multifunctional PLGA particles containing poly(L-glutamic acid)-capped silver nanoparticles and ascorbic acid with simultaneous antioxidative and prolonged antimicrobial activity. in Acta Biomaterialia. 2014;10(1):151-162.
doi:10.1016/j.actbio.2013.08.030 .

Stevanović, Magdalena, Bracko, Ines, Milenković, Marina, Filipović, Nenad, Nunić, Jana, Filipić, Metka, Uskoković, Dragan P., "Multifunctional PLGA particles containing poly(L-glutamic acid)-capped silver nanoparticles and ascorbic acid with simultaneous antioxidative and prolonged antimicrobial activity" in Acta Biomaterialia, 10, no. 1 (2014):151-162,
https://doi.org/10.1016/j.actbio.2013.08.030 . .

TY  - JOUR
AU  - Stevanović, Magdalena
AU  - Skapin, Sreco D.
AU  - Bracko, Ines
AU  - Milenković, Marina
AU  - Petković, Jana
AU  - Filipić, Metka
AU  - Uskoković, Dragan P.
PY  - 2012
UR  - https://farfar.pharmacy.bg.ac.rs/handle/123456789/1733
AB  - Silver nanoparticles (AgNps) were prepared by modified chemical reduction with poly (alpha, gamma, L-glutamic acid) (PGA) as capping agent. These Ag/PGA nanoparticles (AgNpPGAs) were highly stable over long periods of time without signs of precipitation. In addition to obtaining stable AgNpPGAs, a further aim was to examine their encapsulation in the poly(L-lactide-co-glycolide) (PLGA) polymer matrix. The current interest of polymer-AgNps in biomedical applications is because a versatile system must have antimicrobial activity upon target contact, without the release of toxic biocides. The synthesis of these PLGA/AgNpPGAs used physicochemical methods with solvent/non-solvent systems. Degradation of these PLGA/AgNpPGAs and the release rate of their AgNPs were studied in physiological solution over three months. The antimicrobial activity of the samples was investigated towards six laboratory control strains from the American Type Culture Collection (ATCC) and one clinical isolate methicillin-resistant Staphylococcus aureus strain by the broth microdilution method and the results showed superior and extended activity of PLGA/AgNpPGAs. The 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide assay indicated good biocompatibility of these PLGA/AgNpPGAs. The formation of intracellular reactive oxygen species was measured spectrophotometrically using a fluorescent probe, which showed that these PLGA/AgNpPGAs are not inducers of such species. The samples were characterized by UV-VIS spectrometry, X-ray diffraction, zeta potential measurements, field-emission scanning electron microscopy, and transmission electron microscopy.
PB  - Elsevier Sci Ltd, Oxford
T2  - Polymer
T1  - Poly(lactide-co-glycolide)/silver nanoparticles: Synthesis, characterization, antimicrobial activity, cytotoxicity assessment and ROS-inducing potential
VL  - 53
IS  - 14
SP  - 2818
EP  - 2828
DO  - 10.1016/j.polymer.2012.04.057
ER  - 

@article{
author = "Stevanović, Magdalena and Skapin, Sreco D. and Bracko, Ines and Milenković, Marina and Petković, Jana and Filipić, Metka and Uskoković, Dragan P.",
year = "2012",
abstract = "Silver nanoparticles (AgNps) were prepared by modified chemical reduction with poly (alpha, gamma, L-glutamic acid) (PGA) as capping agent. These Ag/PGA nanoparticles (AgNpPGAs) were highly stable over long periods of time without signs of precipitation. In addition to obtaining stable AgNpPGAs, a further aim was to examine their encapsulation in the poly(L-lactide-co-glycolide) (PLGA) polymer matrix. The current interest of polymer-AgNps in biomedical applications is because a versatile system must have antimicrobial activity upon target contact, without the release of toxic biocides. The synthesis of these PLGA/AgNpPGAs used physicochemical methods with solvent/non-solvent systems. Degradation of these PLGA/AgNpPGAs and the release rate of their AgNPs were studied in physiological solution over three months. The antimicrobial activity of the samples was investigated towards six laboratory control strains from the American Type Culture Collection (ATCC) and one clinical isolate methicillin-resistant Staphylococcus aureus strain by the broth microdilution method and the results showed superior and extended activity of PLGA/AgNpPGAs. The 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide assay indicated good biocompatibility of these PLGA/AgNpPGAs. The formation of intracellular reactive oxygen species was measured spectrophotometrically using a fluorescent probe, which showed that these PLGA/AgNpPGAs are not inducers of such species. The samples were characterized by UV-VIS spectrometry, X-ray diffraction, zeta potential measurements, field-emission scanning electron microscopy, and transmission electron microscopy.",
publisher = "Elsevier Sci Ltd, Oxford",
journal = "Polymer",
title = "Poly(lactide-co-glycolide)/silver nanoparticles: Synthesis, characterization, antimicrobial activity, cytotoxicity assessment and ROS-inducing potential",
volume = "53",
number = "14",
pages = "2818-2828",
doi = "10.1016/j.polymer.2012.04.057"
}

Stevanović, M., Skapin, S. D., Bracko, I., Milenković, M., Petković, J., Filipić, M.,& Uskoković, D. P.. (2012). Poly(lactide-co-glycolide)/silver nanoparticles: Synthesis, characterization, antimicrobial activity, cytotoxicity assessment and ROS-inducing potential. in Polymer
Elsevier Sci Ltd, Oxford., 53(14), 2818-2828.
https://doi.org/10.1016/j.polymer.2012.04.057

Stevanović M, Skapin SD, Bracko I, Milenković M, Petković J, Filipić M, Uskoković DP. Poly(lactide-co-glycolide)/silver nanoparticles: Synthesis, characterization, antimicrobial activity, cytotoxicity assessment and ROS-inducing potential. in Polymer. 2012;53(14):2818-2828.
doi:10.1016/j.polymer.2012.04.057 .

Stevanović, Magdalena, Skapin, Sreco D., Bracko, Ines, Milenković, Marina, Petković, Jana, Filipić, Metka, Uskoković, Dragan P., "Poly(lactide-co-glycolide)/silver nanoparticles: Synthesis, characterization, antimicrobial activity, cytotoxicity assessment and ROS-inducing potential" in Polymer, 53, no. 14 (2012):2818-2828,
https://doi.org/10.1016/j.polymer.2012.04.057 . .