TY  - JOUR
AU  - Milić, Petar S.
AU  - Rajković, Katarina M.
AU  - Nikolić, Goran S.
AU  - Jeremić, Sanja
AU  - Đurašević, Mirjana M.
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10640
AB  - The aims of this research were preparation of Juglans nigra husk extracts by employing an ultrasonic-assisted extraction method and process optimization of minerals extraction using response surface methodology. Extracts from J. nigra L. fresh husk were prepared using ethanol (70%, v/v) as a solvent, at different extraction temperatures: 15, 30 and 40 °C, and extraction times: 5, 15, 30, 60 and 80 min. The content of minerals in ethanol extracts was determined using inductively coupled plasma optical emission spectrometry (ICP-OES). The response surface methodology (RSM) was developed to evaluate the effect of two extraction factors as well as to optimize the extraction variables for each mineral individually. The RSM models pointed out 40 °C temperature and extraction time in the range 77–80 min as optimal conditions for extraction of macro- and micro-elements. Results of RSM optimization showed the relative order of maximum obtained yield of macro-elements: K>P>S>Ca>Mg and maximum yield of micro-elements was Si>Zn>Sr>Cu.
T2  - Chemical Engineering Research and Design
T1  - Preparation of Juglans nigra L. husk extracts by applying an ultrasonic-assisted extraction method and process optimization of minerals extraction using response surface methodology
VL  - 191
SP  - 439
EP  - 445
DO  - 10.1016/j.cherd.2023.01.051
ER  - 

@article{
author = "Milić, Petar S. and Rajković, Katarina M. and Nikolić, Goran S. and Jeremić, Sanja and Đurašević, Mirjana M.",
year = "2023",
abstract = "The aims of this research were preparation of Juglans nigra husk extracts by employing an ultrasonic-assisted extraction method and process optimization of minerals extraction using response surface methodology. Extracts from J. nigra L. fresh husk were prepared using ethanol (70%, v/v) as a solvent, at different extraction temperatures: 15, 30 and 40 °C, and extraction times: 5, 15, 30, 60 and 80 min. The content of minerals in ethanol extracts was determined using inductively coupled plasma optical emission spectrometry (ICP-OES). The response surface methodology (RSM) was developed to evaluate the effect of two extraction factors as well as to optimize the extraction variables for each mineral individually. The RSM models pointed out 40 °C temperature and extraction time in the range 77–80 min as optimal conditions for extraction of macro- and micro-elements. Results of RSM optimization showed the relative order of maximum obtained yield of macro-elements: K>P>S>Ca>Mg and maximum yield of micro-elements was Si>Zn>Sr>Cu.",
journal = "Chemical Engineering Research and Design",
title = "Preparation of Juglans nigra L. husk extracts by applying an ultrasonic-assisted extraction method and process optimization of minerals extraction using response surface methodology",
volume = "191",
pages = "439-445",
doi = "10.1016/j.cherd.2023.01.051"
}

Milić, P. S., Rajković, K. M., Nikolić, G. S., Jeremić, S.,& Đurašević, M. M.. (2023). Preparation of Juglans nigra L. husk extracts by applying an ultrasonic-assisted extraction method and process optimization of minerals extraction using response surface methodology. in Chemical Engineering Research and Design, 191, 439-445.
https://doi.org/10.1016/j.cherd.2023.01.051

Milić PS, Rajković KM, Nikolić GS, Jeremić S, Đurašević MM. Preparation of Juglans nigra L. husk extracts by applying an ultrasonic-assisted extraction method and process optimization of minerals extraction using response surface methodology. in Chemical Engineering Research and Design. 2023;191:439-445.
doi:10.1016/j.cherd.2023.01.051 .

Milić, Petar S., Rajković, Katarina M., Nikolić, Goran S., Jeremić, Sanja, Đurašević, Mirjana M., "Preparation of Juglans nigra L. husk extracts by applying an ultrasonic-assisted extraction method and process optimization of minerals extraction using response surface methodology" in Chemical Engineering Research and Design, 191 (2023):439-445,
https://doi.org/10.1016/j.cherd.2023.01.051 . .

TY  - CONF
AU  - Miljković, Vojkan
AU  - Mrmošanin, Jelena
AU  - Zvezdanović, Jelena
AU  - Momčilović, Milan Z.
AU  - Miljković, Milena
AU  - Mihajlov-Krstev, Tatjana
AU  - Nikolić, Ljubiša
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12250
AB  - Citrus fruits are widely consumed around the world and among them grapefruit (Citrus paradisi macfad) stands out with its characteristic appearance and flavor. The fruit is growing on a tree that belongs to Rutaceae family and its positive contribution to health is attributed to phytochemicals found in it. The phytochemicals have the key role in mediating oxidation process because they act as antioxidants and by that prevention of cell damage, reducing the risks of many diseases, boosting of the immune system, balancing hormone levels, and notable antibacterial and antiviral response of the organism happens. Grapefruits contain several phytochemicals including: carotenoids, flavonoids (naringin), limonoids, organic acids, pectin, and folate. Considering the worldwide consumption and popularity in everyday diet of grapefruit, the antioxidant activity of its extracts is determined in this paper. Weighed amount 10 g of fresh grapefruits was added to a mixture consisting of organic solvents (hexane, acetone, and ethanol in volumes ratio 2:1:1, respectively) and 0.05% (w/v) butylated hydroxytoluene. The mixture was stoppered and mixed on an orbital shaker at 180 rpm for 15 minutes. The temperature during the mixing was kept at 5 °C in the water bath. Afterward, 7.5 ml of cold deionized water on every 10 grams of starting sample was added to the mixture and agitated for another 5 min. The suspension was transferred to a separation funnel to separate the upper (non-polar) from the lower (polar) phase for 10 minutes at room temperature. The polar phase was subjected for antioxidant capacity determination by ABTS, DPPH, FRAP and CUPRAC methods. The results for the applied methods expressed per kg of the sample are: 1.8 mmol∙kg-1, 0.72 mmol∙kg-1, 9.7 μmol∙kg-1, 4.66 mmol∙kg-1, respectively. The obtained results are recommending grapefruit as a potent source of phytochemicals with antioxidant properties.
PB  - Leskovac : Faculty of Technology, University of Niš
C3  - 15th International symposium „Novel technologies and sustainable development" : Book of Abstracts
T1  - Antioxidant Activity of Grapefruit (Citrus Paradisi) Extract
SP  - 70
EP  - 70
UR  - https://hdl.handle.net/21.15107/rcub_vinar_12250
ER  - 

@conference{
author = "Miljković, Vojkan and Mrmošanin, Jelena and Zvezdanović, Jelena and Momčilović, Milan Z. and Miljković, Milena and Mihajlov-Krstev, Tatjana and Nikolić, Ljubiša",
year = "2023",
abstract = "Citrus fruits are widely consumed around the world and among them grapefruit (Citrus paradisi macfad) stands out with its characteristic appearance and flavor. The fruit is growing on a tree that belongs to Rutaceae family and its positive contribution to health is attributed to phytochemicals found in it. The phytochemicals have the key role in mediating oxidation process because they act as antioxidants and by that prevention of cell damage, reducing the risks of many diseases, boosting of the immune system, balancing hormone levels, and notable antibacterial and antiviral response of the organism happens. Grapefruits contain several phytochemicals including: carotenoids, flavonoids (naringin), limonoids, organic acids, pectin, and folate. Considering the worldwide consumption and popularity in everyday diet of grapefruit, the antioxidant activity of its extracts is determined in this paper. Weighed amount 10 g of fresh grapefruits was added to a mixture consisting of organic solvents (hexane, acetone, and ethanol in volumes ratio 2:1:1, respectively) and 0.05% (w/v) butylated hydroxytoluene. The mixture was stoppered and mixed on an orbital shaker at 180 rpm for 15 minutes. The temperature during the mixing was kept at 5 °C in the water bath. Afterward, 7.5 ml of cold deionized water on every 10 grams of starting sample was added to the mixture and agitated for another 5 min. The suspension was transferred to a separation funnel to separate the upper (non-polar) from the lower (polar) phase for 10 minutes at room temperature. The polar phase was subjected for antioxidant capacity determination by ABTS, DPPH, FRAP and CUPRAC methods. The results for the applied methods expressed per kg of the sample are: 1.8 mmol∙kg-1, 0.72 mmol∙kg-1, 9.7 μmol∙kg-1, 4.66 mmol∙kg-1, respectively. The obtained results are recommending grapefruit as a potent source of phytochemicals with antioxidant properties.",
publisher = "Leskovac : Faculty of Technology, University of Niš",
journal = "15th International symposium „Novel technologies and sustainable development" : Book of Abstracts",
title = "Antioxidant Activity of Grapefruit (Citrus Paradisi) Extract",
pages = "70-70",
url = "https://hdl.handle.net/21.15107/rcub_vinar_12250"
}

Miljković, V., Mrmošanin, J., Zvezdanović, J., Momčilović, M. Z., Miljković, M., Mihajlov-Krstev, T.,& Nikolić, L.. (2023). Antioxidant Activity of Grapefruit (Citrus Paradisi) Extract. in 15th International symposium „Novel technologies and sustainable development" : Book of Abstracts
Leskovac : Faculty of Technology, University of Niš., 70-70.
https://hdl.handle.net/21.15107/rcub_vinar_12250

Miljković V, Mrmošanin J, Zvezdanović J, Momčilović MZ, Miljković M, Mihajlov-Krstev T, Nikolić L. Antioxidant Activity of Grapefruit (Citrus Paradisi) Extract. in 15th International symposium „Novel technologies and sustainable development" : Book of Abstracts. 2023;:70-70.
https://hdl.handle.net/21.15107/rcub_vinar_12250 .

Miljković, Vojkan, Mrmošanin, Jelena, Zvezdanović, Jelena, Momčilović, Milan Z., Miljković, Milena, Mihajlov-Krstev, Tatjana, Nikolić, Ljubiša, "Antioxidant Activity of Grapefruit (Citrus Paradisi) Extract" in 15th International symposium „Novel technologies and sustainable development" : Book of Abstracts (2023):70-70,
https://hdl.handle.net/21.15107/rcub_vinar_12250 .

TY  - JOUR
AU  - Miljković, Vojkan M.
AU  - Momčilović, Milan Z.
AU  - Zvezdanović, Jelena B.
AU  - Gajić, Ivana Lj.
AU  - Mrmošanin, Jelena M.
AU  - Mihajlov-Krstev, Tatjana
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10553
AB  - This work provides an insight into the nutritional quality of Hector-F1 tomato (Solanum lycopersicum L.) fruit grown in Serbia and the juice prepared from it regarding the contents of carotenoids, flavonoids and polyphenols as compounds beneficial for a healthy diet. Initially, ultra-high performance liquid chromatography with electrospray ionization mass spectrometry (UHPLC-ESI-MS) was employed for both polar and non-polar tomato extracts to identify compounds present in the samples. Then, lycopene, β-carotene, total polyphenols and flavonoids contents were determined by means of ultraviolet-visible (UV-Vis) spectrophotometry. To evaluate the antioxidant activity of the samples, four methods were applied, namely, the 2,2’-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid (ABTS) method, 2,2-diphenyl-1-picrylhydrazyl (DPPH) method, the ferric ion reducing antioxidant power (FRAP) method and the cupric ion reducing antioxidant capacity (CUPRAC) method. In addition, the antimicrobial potential was tested against gram-positive bacteria, gram-negative bacteria and the yeast Candida albicans. The thermal treatment in all cases modified the chemical composition of tomato as demonstrated by a decrease in values of all measured parameters. This comprehensive analysis provided data applicable to profiling and comparing cultivars grown in different geographical regions. © 2022 National Agricultural and Food Centre (Slovakia).
T2  - Journal of Food and Nutrition Research
T1  - Carotenoid and flavonoid levels, antioxidant activity and antimicrobial properties of tomato grown in Serbia
VL  - 61
IS  - 4
SP  - 402
EP  - 414
UR  - https://hdl.handle.net/21.15107/rcub_vinar_10553
ER  - 

@article{
author = "Miljković, Vojkan M. and Momčilović, Milan Z. and Zvezdanović, Jelena B. and Gajić, Ivana Lj. and Mrmošanin, Jelena M. and Mihajlov-Krstev, Tatjana",
year = "2022",
abstract = "This work provides an insight into the nutritional quality of Hector-F1 tomato (Solanum lycopersicum L.) fruit grown in Serbia and the juice prepared from it regarding the contents of carotenoids, flavonoids and polyphenols as compounds beneficial for a healthy diet. Initially, ultra-high performance liquid chromatography with electrospray ionization mass spectrometry (UHPLC-ESI-MS) was employed for both polar and non-polar tomato extracts to identify compounds present in the samples. Then, lycopene, β-carotene, total polyphenols and flavonoids contents were determined by means of ultraviolet-visible (UV-Vis) spectrophotometry. To evaluate the antioxidant activity of the samples, four methods were applied, namely, the 2,2’-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid (ABTS) method, 2,2-diphenyl-1-picrylhydrazyl (DPPH) method, the ferric ion reducing antioxidant power (FRAP) method and the cupric ion reducing antioxidant capacity (CUPRAC) method. In addition, the antimicrobial potential was tested against gram-positive bacteria, gram-negative bacteria and the yeast Candida albicans. The thermal treatment in all cases modified the chemical composition of tomato as demonstrated by a decrease in values of all measured parameters. This comprehensive analysis provided data applicable to profiling and comparing cultivars grown in different geographical regions. © 2022 National Agricultural and Food Centre (Slovakia).",
journal = "Journal of Food and Nutrition Research",
title = "Carotenoid and flavonoid levels, antioxidant activity and antimicrobial properties of tomato grown in Serbia",
volume = "61",
number = "4",
pages = "402-414",
url = "https://hdl.handle.net/21.15107/rcub_vinar_10553"
}

Miljković, V. M., Momčilović, M. Z., Zvezdanović, J. B., Gajić, I. Lj., Mrmošanin, J. M.,& Mihajlov-Krstev, T.. (2022). Carotenoid and flavonoid levels, antioxidant activity and antimicrobial properties of tomato grown in Serbia. in Journal of Food and Nutrition Research, 61(4), 402-414.
https://hdl.handle.net/21.15107/rcub_vinar_10553

Miljković VM, Momčilović MZ, Zvezdanović JB, Gajić IL, Mrmošanin JM, Mihajlov-Krstev T. Carotenoid and flavonoid levels, antioxidant activity and antimicrobial properties of tomato grown in Serbia. in Journal of Food and Nutrition Research. 2022;61(4):402-414.
https://hdl.handle.net/21.15107/rcub_vinar_10553 .

Miljković, Vojkan M., Momčilović, Milan Z., Zvezdanović, Jelena B., Gajić, Ivana Lj., Mrmošanin, Jelena M., Mihajlov-Krstev, Tatjana, "Carotenoid and flavonoid levels, antioxidant activity and antimicrobial properties of tomato grown in Serbia" in Journal of Food and Nutrition Research, 61, no. 4 (2022):402-414,
https://hdl.handle.net/21.15107/rcub_vinar_10553 .

TY  - CONF
AU  - Nikolić, Ljubiša
AU  - Najman, Stevo
AU  - Petrović, Đorđe
AU  - Urošević, Maja
AU  - Nikolić, Vesna
AU  - Cakić, Suzana
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11667
AB  - Poly(N-isopropylmethacrylamide) has significant potential for designing thermosensitive new materials. It is similar with well-known poly(N-isopropylacrylamide) hydrogels. The influence of the α-methylation on the each monomer unit in the main chain exhibits weaker intermolecular interactions between the amide group. The method of thermally-initiated free radical polymerization was applied to synthesize a series of poly(N-isopropylmethacrylamide) hydrogels with different cross-linker amount. The micrographs, obtained by the scanning electron microscopy method, indicated a semi-homogeneous crosslinked network of these hydrogels which can be classified as macroporous. The swelling behavior at room temperature of these negatively thermosensitive hydrogel exhibit a little higher swelling degree in acidic media (at pH 2.0 swelling degree was about 21) in relation to the weakly basic media (at pH 7.4 swelling degree was about 18). The poly(N-isopropylmethacrylamide) hydrogel topology showed much free space within the crosslinked polymer chains in the swollen state and they could be use as absorbers of water, diluents, dissolvent, solutions, or as carriers for active substances.
PB  - University in Banjaluka : Faculty of Technology
C3  - 14th Conference of chemists, technologists and environmentalists of Republic of Srpska : the book of abstracts; Oct 21-22, Banja Luka, Republic of Srpska
T1  - The influence of poly(N-isopropylmethacrylamide) hydrogels crosslinking on their swelling capacity
SP  - 71
UR  - https://hdl.handle.net/21.15107/rcub_vinar_11667
ER  - 

@conference{
author = "Nikolić, Ljubiša and Najman, Stevo and Petrović, Đorđe and Urošević, Maja and Nikolić, Vesna and Cakić, Suzana",
year = "2022",
abstract = "Poly(N-isopropylmethacrylamide) has significant potential for designing thermosensitive new materials. It is similar with well-known poly(N-isopropylacrylamide) hydrogels. The influence of the α-methylation on the each monomer unit in the main chain exhibits weaker intermolecular interactions between the amide group. The method of thermally-initiated free radical polymerization was applied to synthesize a series of poly(N-isopropylmethacrylamide) hydrogels with different cross-linker amount. The micrographs, obtained by the scanning electron microscopy method, indicated a semi-homogeneous crosslinked network of these hydrogels which can be classified as macroporous. The swelling behavior at room temperature of these negatively thermosensitive hydrogel exhibit a little higher swelling degree in acidic media (at pH 2.0 swelling degree was about 21) in relation to the weakly basic media (at pH 7.4 swelling degree was about 18). The poly(N-isopropylmethacrylamide) hydrogel topology showed much free space within the crosslinked polymer chains in the swollen state and they could be use as absorbers of water, diluents, dissolvent, solutions, or as carriers for active substances.",
publisher = "University in Banjaluka : Faculty of Technology",
journal = "14th Conference of chemists, technologists and environmentalists of Republic of Srpska : the book of abstracts; Oct 21-22, Banja Luka, Republic of Srpska",
title = "The influence of poly(N-isopropylmethacrylamide) hydrogels crosslinking on their swelling capacity",
pages = "71",
url = "https://hdl.handle.net/21.15107/rcub_vinar_11667"
}

Nikolić, L., Najman, S., Petrović, Đ., Urošević, M., Nikolić, V.,& Cakić, S.. (2022). The influence of poly(N-isopropylmethacrylamide) hydrogels crosslinking on their swelling capacity. in 14th Conference of chemists, technologists and environmentalists of Republic of Srpska : the book of abstracts; Oct 21-22, Banja Luka, Republic of Srpska
University in Banjaluka : Faculty of Technology., 71.
https://hdl.handle.net/21.15107/rcub_vinar_11667

Nikolić L, Najman S, Petrović Đ, Urošević M, Nikolić V, Cakić S. The influence of poly(N-isopropylmethacrylamide) hydrogels crosslinking on their swelling capacity. in 14th Conference of chemists, technologists and environmentalists of Republic of Srpska : the book of abstracts; Oct 21-22, Banja Luka, Republic of Srpska. 2022;:71.
https://hdl.handle.net/21.15107/rcub_vinar_11667 .

Nikolić, Ljubiša, Najman, Stevo, Petrović, Đorđe, Urošević, Maja, Nikolić, Vesna, Cakić, Suzana, "The influence of poly(N-isopropylmethacrylamide) hydrogels crosslinking on their swelling capacity" in 14th Conference of chemists, technologists and environmentalists of Republic of Srpska : the book of abstracts; Oct 21-22, Banja Luka, Republic of Srpska (2022):71,
https://hdl.handle.net/21.15107/rcub_vinar_11667 .

TY  - CONF
AU  - Ilić-Stojanović, Snežana
AU  - Nikolić, Ljubiša
AU  - Petrović, Đorđe
AU  - Stojanović, Jelena
AU  - Urošević, Maja
AU  - Nikolić, Vesna
AU  - Cakić, Suzana
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11668
AB  - Poly(N-isopropylmethacrylamide) homopolymer, which belongs to thermosensitive hydrogels, was synthesized by free radical polymerization method with 1.5 mol% of ethylene glycol dimethacrylate as cross-linker. The structure of obtained homopolymer network was confirmed by Fourier transform infrared spectroscopy analysis. The hydrogel in the gelatinous state was subjected to gamma irradiation in order to additionally form a three-dimensional network in a solid state. Suddenly, the synthesized gelatinous homopolymer was transformed into the liquid state after irradiation instead of expected additional crosslinking. Breakdown of poly(Nisopropylmethacrylamide) homopolymer was confirmed by using different methods: gel permeation chromatography, the static headspace gas chromatography mass spectrometry and gas chromatography/flame ionization detection methods. New compounds, different from the homopolymer, monomer and crosslinker were detected after irradiation. As result, the gamma irradiation will be applicable for the poly(N-isopropylmethacrylamide) homopolymer decomposition and useful to further recyclability analysis.
PB  - University in Banjaluka : Faculty of Technology
C3  - 14th Conference of chemists, technologists and environmentalists of Republic of Srpska : the book of abstracts; Oct 21-22, Banja Luka, Republic of Srpska
T1  - Decomposition of poly(N-isopropylmethacrylamide) homopolymer network
SP  - 72
UR  - https://hdl.handle.net/21.15107/rcub_vinar_11668
ER  - 

@conference{
author = "Ilić-Stojanović, Snežana and Nikolić, Ljubiša and Petrović, Đorđe and Stojanović, Jelena and Urošević, Maja and Nikolić, Vesna and Cakić, Suzana",
year = "2022",
abstract = "Poly(N-isopropylmethacrylamide) homopolymer, which belongs to thermosensitive hydrogels, was synthesized by free radical polymerization method with 1.5 mol% of ethylene glycol dimethacrylate as cross-linker. The structure of obtained homopolymer network was confirmed by Fourier transform infrared spectroscopy analysis. The hydrogel in the gelatinous state was subjected to gamma irradiation in order to additionally form a three-dimensional network in a solid state. Suddenly, the synthesized gelatinous homopolymer was transformed into the liquid state after irradiation instead of expected additional crosslinking. Breakdown of poly(Nisopropylmethacrylamide) homopolymer was confirmed by using different methods: gel permeation chromatography, the static headspace gas chromatography mass spectrometry and gas chromatography/flame ionization detection methods. New compounds, different from the homopolymer, monomer and crosslinker were detected after irradiation. As result, the gamma irradiation will be applicable for the poly(N-isopropylmethacrylamide) homopolymer decomposition and useful to further recyclability analysis.",
publisher = "University in Banjaluka : Faculty of Technology",
journal = "14th Conference of chemists, technologists and environmentalists of Republic of Srpska : the book of abstracts; Oct 21-22, Banja Luka, Republic of Srpska",
title = "Decomposition of poly(N-isopropylmethacrylamide) homopolymer network",
pages = "72",
url = "https://hdl.handle.net/21.15107/rcub_vinar_11668"
}

Ilić-Stojanović, S., Nikolić, L., Petrović, Đ., Stojanović, J., Urošević, M., Nikolić, V.,& Cakić, S.. (2022). Decomposition of poly(N-isopropylmethacrylamide) homopolymer network. in 14th Conference of chemists, technologists and environmentalists of Republic of Srpska : the book of abstracts; Oct 21-22, Banja Luka, Republic of Srpska
University in Banjaluka : Faculty of Technology., 72.
https://hdl.handle.net/21.15107/rcub_vinar_11668

Ilić-Stojanović S, Nikolić L, Petrović Đ, Stojanović J, Urošević M, Nikolić V, Cakić S. Decomposition of poly(N-isopropylmethacrylamide) homopolymer network. in 14th Conference of chemists, technologists and environmentalists of Republic of Srpska : the book of abstracts; Oct 21-22, Banja Luka, Republic of Srpska. 2022;:72.
https://hdl.handle.net/21.15107/rcub_vinar_11668 .

Ilić-Stojanović, Snežana, Nikolić, Ljubiša, Petrović, Đorđe, Stojanović, Jelena, Urošević, Maja, Nikolić, Vesna, Cakić, Suzana, "Decomposition of poly(N-isopropylmethacrylamide) homopolymer network" in 14th Conference of chemists, technologists and environmentalists of Republic of Srpska : the book of abstracts; Oct 21-22, Banja Luka, Republic of Srpska (2022):72,
https://hdl.handle.net/21.15107/rcub_vinar_11668 .

TY  - CONF
AU  - Petrović, Đorđe Ž.
AU  - Kumrić, Ksenija
AU  - Mirković, Marija D.
AU  - Ilić-Stojanović, Snežana
AU  - Matović, Ljiljana
AU  - Eraković, Zorica
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12080
AB  - The use of high energy, ionizing radiation in nuclear medicine is now pervasive and routine. The interaction of gamma radiation with aqueous solutions produces different kinds of reducing and oxidizing agents. Reducing agents represent eaq, H• and H2 while oxidizing agents represent H2O2, •OH, O2, O2 - and HO2 [1]. Production of such species under gamma irradiation, there may affect the rates or mechanisms of corrosion attack modes. In recent times, electrochemical frequency modulation (EFM) has caught the attention of corrosion scientists as a rapid and non–destructive technique for the instantaneous determination of corrosion rate. The advantage of the EFM technique is the fact that the measurement can be completed in a short time period [2]. The EFM technique offers an excellent alternative for the analysis of electrochemical corrosion behavior of metals compared with contemporary techniques like potentiodynamic polarization, linear polarization, electrochemical impedance spectroscopy and weight loss. This technique provides measurements of corrosion rate directly without knowledge of the Tafel constants. Even though the Tafel constants are not required, it measures them and a change in Tafel constant may indicate a change in corrosion mechanism. The theory behind the technique is the same Butler-Volmer kinetics that underpins all corrosion rate measurements. It is a small signal ac technique where two sine waves (at different frequencies) are applied to the cell simultaneously. In our work, we used the EFM technique to calculate the corrosion rate on stainless steel samples in saline and under gamma radiation.
AB  - Nerđajući čelici su omiljeni materijali u nuklearnoj medicini zbog jednostavnog održavanja (brisanje, dekontaminacija, itd.). Otpornost na rđanje ovih materijala je smanjena usled istovremenog delovanja hloridnih jona i jonizujućeg zračenja. Brza i nedestruktivna tehnika merenja korozije, kao što je elektrohemijska frekvenciona modulacija (EFM), korisna je za brzu procenu materijala koji moraju biti otporni na rđаnje. Tri različite cevi od nerđajućeg čelika su analizirane pomoću EFM metode i Gamry potenciostata / galvanostata, i izračunate su njihove brzine korozije. Uzorak označen kao S II, koji ne sadrži Mo u svom sastavu pokazuje veću brzinu korozije u odnosu na uzorke koji sadrže Mo ako je istovremeno izložen hloridnim jonima i gama zračenju. Ovaj rezultat je u sagalsnosti sa sastavom nerdjajučćeg čelika dobijenim rentgenskim fluorescentnim spektrometrom koji pokazuje nedostatak bakra i vanadijuma u tragovima, uključujući molibden.
PB  - Belgrade : Serbian Chemical Society
C3  - 57th Meeting of the Serbian Chemical Society : Book of Abstracts, Proceedings
T1  - Corrosion Rate of Stainless Steel Tubes Calculated by Electrochemical Frequency Modulation
T1  - Brzina korozije cevi od nerđajućih čelika izračunata pomoću elektrohemijske frekvencione modulacije
SP  - 108
EP  - 113
UR  - https://hdl.handle.net/21.15107/rcub_vinar_12080
ER  - 

@conference{
author = "Petrović, Đorđe Ž. and Kumrić, Ksenija and Mirković, Marija D. and Ilić-Stojanović, Snežana and Matović, Ljiljana and Eraković, Zorica",
year = "2021",
abstract = "The use of high energy, ionizing radiation in nuclear medicine is now pervasive and routine. The interaction of gamma radiation with aqueous solutions produces different kinds of reducing and oxidizing agents. Reducing agents represent eaq, H• and H2 while oxidizing agents represent H2O2, •OH, O2, O2 - and HO2 [1]. Production of such species under gamma irradiation, there may affect the rates or mechanisms of corrosion attack modes. In recent times, electrochemical frequency modulation (EFM) has caught the attention of corrosion scientists as a rapid and non–destructive technique for the instantaneous determination of corrosion rate. The advantage of the EFM technique is the fact that the measurement can be completed in a short time period [2]. The EFM technique offers an excellent alternative for the analysis of electrochemical corrosion behavior of metals compared with contemporary techniques like potentiodynamic polarization, linear polarization, electrochemical impedance spectroscopy and weight loss. This technique provides measurements of corrosion rate directly without knowledge of the Tafel constants. Even though the Tafel constants are not required, it measures them and a change in Tafel constant may indicate a change in corrosion mechanism. The theory behind the technique is the same Butler-Volmer kinetics that underpins all corrosion rate measurements. It is a small signal ac technique where two sine waves (at different frequencies) are applied to the cell simultaneously. In our work, we used the EFM technique to calculate the corrosion rate on stainless steel samples in saline and under gamma radiation., Nerđajući čelici su omiljeni materijali u nuklearnoj medicini zbog jednostavnog održavanja (brisanje, dekontaminacija, itd.). Otpornost na rđanje ovih materijala je smanjena usled istovremenog delovanja hloridnih jona i jonizujućeg zračenja. Brza i nedestruktivna tehnika merenja korozije, kao što je elektrohemijska frekvenciona modulacija (EFM), korisna je za brzu procenu materijala koji moraju biti otporni na rđаnje. Tri različite cevi od nerđajućeg čelika su analizirane pomoću EFM metode i Gamry potenciostata / galvanostata, i izračunate su njihove brzine korozije. Uzorak označen kao S II, koji ne sadrži Mo u svom sastavu pokazuje veću brzinu korozije u odnosu na uzorke koji sadrže Mo ako je istovremeno izložen hloridnim jonima i gama zračenju. Ovaj rezultat je u sagalsnosti sa sastavom nerdjajučćeg čelika dobijenim rentgenskim fluorescentnim spektrometrom koji pokazuje nedostatak bakra i vanadijuma u tragovima, uključujući molibden.",
publisher = "Belgrade : Serbian Chemical Society",
journal = "57th Meeting of the Serbian Chemical Society : Book of Abstracts, Proceedings",
title = "Corrosion Rate of Stainless Steel Tubes Calculated by Electrochemical Frequency Modulation, Brzina korozije cevi od nerđajućih čelika izračunata pomoću elektrohemijske frekvencione modulacije",
pages = "108-113",
url = "https://hdl.handle.net/21.15107/rcub_vinar_12080"
}

Petrović, Đ. Ž., Kumrić, K., Mirković, M. D., Ilić-Stojanović, S., Matović, L.,& Eraković, Z.. (2021). Corrosion Rate of Stainless Steel Tubes Calculated by Electrochemical Frequency Modulation. in 57th Meeting of the Serbian Chemical Society : Book of Abstracts, Proceedings
Belgrade : Serbian Chemical Society., 108-113.
https://hdl.handle.net/21.15107/rcub_vinar_12080

Petrović ĐŽ, Kumrić K, Mirković MD, Ilić-Stojanović S, Matović L, Eraković Z. Corrosion Rate of Stainless Steel Tubes Calculated by Electrochemical Frequency Modulation. in 57th Meeting of the Serbian Chemical Society : Book of Abstracts, Proceedings. 2021;:108-113.
https://hdl.handle.net/21.15107/rcub_vinar_12080 .

Petrović, Đorđe Ž., Kumrić, Ksenija, Mirković, Marija D., Ilić-Stojanović, Snežana, Matović, Ljiljana, Eraković, Zorica, "Corrosion Rate of Stainless Steel Tubes Calculated by Electrochemical Frequency Modulation" in 57th Meeting of the Serbian Chemical Society : Book of Abstracts, Proceedings (2021):108-113,
https://hdl.handle.net/21.15107/rcub_vinar_12080 .

TY  - JOUR
AU  - Ilić-Stojanović, Snežana
AU  - Urošević, Maja
AU  - Nikolić, Ljubiša
AU  - Petrović, Đorđe
AU  - Stanojević, Jelena
AU  - Najman, Stevo
AU  - Nikolić, Vesna
PY  - 2020
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9033
AB  - Poly(N-isopropylmethacrylamide) (p(NiPMAm)) is one of the lesser known homopolymers that has significant potential for designing new “intelligent” materials. The aims of this work were the synthesis a series of cross-linked p(NiPMAm) hydrogels by the free radical polymerization method and the application of gamma-ray radiation for additional cross-linking. The synthesized p(NiPMAm) hydrogels were structurally characterized by Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). The amount of unreacted monomers was analyzed using high pressure liquid chromatography (HPLC) to evaluate conversion of monomers into polymers. The swelling behavior was monitored in dependence of pH and temperature changes. The previous aim of gamma-ray radiation was the further the cross-linkage of the obtained hydrogel sample in the gelatinous, paste-like state, but the gamma-ray radiation caused decomposition. After absorbing irradiation doses, they transformed into the liquid phase. The results obtained by the gel permeation chromatography (GPC) method indicated that only oligomers and monomers were present in the irradiated liquid material, without molecules with a higher average molar mass, i.e., that the decomposition of the hydrogels occurred. Additionally, the irradiated liquid material was analyzed using the static headspace gas chromatography mass spectrometry (HSS-GC/MS) and gas chromatography/flame ionization detection (HSS-GC/FID) methods. The presence of unchanged initiator molecule and a dominant amount of four new molecules that were different from homopolymers and the reactant (monomer and cross-linker) were determined.
T2  - Polymers
T1  - Intelligent Poly(N-Isopropylmethacrylamide) Hydrogels: Synthesis, Structure Characterization, Stimuli-Responsive Swelling Properties, and Their Radiation Decomposition
VL  - 12
IS  - 5
SP  - 1112
DO  - 10.3390/polym12051112
ER  - 

@article{
author = "Ilić-Stojanović, Snežana and Urošević, Maja and Nikolić, Ljubiša and Petrović, Đorđe and Stanojević, Jelena and Najman, Stevo and Nikolić, Vesna",
year = "2020",
abstract = "Poly(N-isopropylmethacrylamide) (p(NiPMAm)) is one of the lesser known homopolymers that has significant potential for designing new “intelligent” materials. The aims of this work were the synthesis a series of cross-linked p(NiPMAm) hydrogels by the free radical polymerization method and the application of gamma-ray radiation for additional cross-linking. The synthesized p(NiPMAm) hydrogels were structurally characterized by Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). The amount of unreacted monomers was analyzed using high pressure liquid chromatography (HPLC) to evaluate conversion of monomers into polymers. The swelling behavior was monitored in dependence of pH and temperature changes. The previous aim of gamma-ray radiation was the further the cross-linkage of the obtained hydrogel sample in the gelatinous, paste-like state, but the gamma-ray radiation caused decomposition. After absorbing irradiation doses, they transformed into the liquid phase. The results obtained by the gel permeation chromatography (GPC) method indicated that only oligomers and monomers were present in the irradiated liquid material, without molecules with a higher average molar mass, i.e., that the decomposition of the hydrogels occurred. Additionally, the irradiated liquid material was analyzed using the static headspace gas chromatography mass spectrometry (HSS-GC/MS) and gas chromatography/flame ionization detection (HSS-GC/FID) methods. The presence of unchanged initiator molecule and a dominant amount of four new molecules that were different from homopolymers and the reactant (monomer and cross-linker) were determined.",
journal = "Polymers",
title = "Intelligent Poly(N-Isopropylmethacrylamide) Hydrogels: Synthesis, Structure Characterization, Stimuli-Responsive Swelling Properties, and Their Radiation Decomposition",
volume = "12",
number = "5",
pages = "1112",
doi = "10.3390/polym12051112"
}

Ilić-Stojanović, S., Urošević, M., Nikolić, L., Petrović, Đ., Stanojević, J., Najman, S.,& Nikolić, V.. (2020). Intelligent Poly(N-Isopropylmethacrylamide) Hydrogels: Synthesis, Structure Characterization, Stimuli-Responsive Swelling Properties, and Their Radiation Decomposition. in Polymers, 12(5), 1112.
https://doi.org/10.3390/polym12051112

Ilić-Stojanović S, Urošević M, Nikolić L, Petrović Đ, Stanojević J, Najman S, Nikolić V. Intelligent Poly(N-Isopropylmethacrylamide) Hydrogels: Synthesis, Structure Characterization, Stimuli-Responsive Swelling Properties, and Their Radiation Decomposition. in Polymers. 2020;12(5):1112.
doi:10.3390/polym12051112 .

Ilić-Stojanović, Snežana, Urošević, Maja, Nikolić, Ljubiša, Petrović, Đorđe, Stanojević, Jelena, Najman, Stevo, Nikolić, Vesna, "Intelligent Poly(N-Isopropylmethacrylamide) Hydrogels: Synthesis, Structure Characterization, Stimuli-Responsive Swelling Properties, and Their Radiation Decomposition" in Polymers, 12, no. 5 (2020):1112,
https://doi.org/10.3390/polym12051112 . .

TY  - CONF
AU  - Eraković, Zorica
AU  - Ilić-Stojanović, Snežana
AU  - Cakić, Suzana
AU  - Nikolić, Ljubiša
AU  - Petrović, Slobodan D.
AU  - Veljović, Đorđe
AU  - Petrović, Đorđe
PY  - 2020
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11136
PB  - RAD Centre, Niš, Serbia
C3  - RAD 2020 : 8th International Conference on Radiation in Various Fields of Research : book of abstracts; Virtual Conference
T1  - Swelling behavior of synthesized poly(1-vinyl-2-pyrrolidone-co-vinyl acetate) hydrogels
SP  - 55
UR  - https://hdl.handle.net/21.15107/rcub_vinar_11136
ER  - 

@conference{
author = "Eraković, Zorica and Ilić-Stojanović, Snežana and Cakić, Suzana and Nikolić, Ljubiša and Petrović, Slobodan D. and Veljović, Đorđe and Petrović, Đorđe",
year = "2020",
publisher = "RAD Centre, Niš, Serbia",
journal = "RAD 2020 : 8th International Conference on Radiation in Various Fields of Research : book of abstracts; Virtual Conference",
title = "Swelling behavior of synthesized poly(1-vinyl-2-pyrrolidone-co-vinyl acetate) hydrogels",
pages = "55",
url = "https://hdl.handle.net/21.15107/rcub_vinar_11136"
}

Eraković, Z., Ilić-Stojanović, S., Cakić, S., Nikolić, L., Petrović, S. D., Veljović, Đ.,& Petrović, Đ.. (2020). Swelling behavior of synthesized poly(1-vinyl-2-pyrrolidone-co-vinyl acetate) hydrogels. in RAD 2020 : 8th International Conference on Radiation in Various Fields of Research : book of abstracts; Virtual Conference
RAD Centre, Niš, Serbia., 55.
https://hdl.handle.net/21.15107/rcub_vinar_11136

Eraković Z, Ilić-Stojanović S, Cakić S, Nikolić L, Petrović SD, Veljović Đ, Petrović Đ. Swelling behavior of synthesized poly(1-vinyl-2-pyrrolidone-co-vinyl acetate) hydrogels. in RAD 2020 : 8th International Conference on Radiation in Various Fields of Research : book of abstracts; Virtual Conference. 2020;:55.
https://hdl.handle.net/21.15107/rcub_vinar_11136 .

Eraković, Zorica, Ilić-Stojanović, Snežana, Cakić, Suzana, Nikolić, Ljubiša, Petrović, Slobodan D., Veljović, Đorđe, Petrović, Đorđe, "Swelling behavior of synthesized poly(1-vinyl-2-pyrrolidone-co-vinyl acetate) hydrogels" in RAD 2020 : 8th International Conference on Radiation in Various Fields of Research : book of abstracts; Virtual Conference (2020):55,
https://hdl.handle.net/21.15107/rcub_vinar_11136 .