TY  - JOUR
AU  - Mirković, Snjezana
AU  - Rajković, Katarina
AU  - Jeremić, Sanja
AU  - Gavrilović, Marijana
AU  - Tomić, Ljiljana
AU  - Arsić-Arsenijević, Valentina
AU  - Krstić, Boro
PY  - 2018
UR  - https://imagine.imgge.bg.ac.rs/handle/123456789/1112
AB  - The objective of this paper was to assess the antiradical effectiveness of propolis extract (PE) based on 2.2-diphenyl-1-picrylhydrazyl radical (DPPH center dot) bleaching assay kinetic profile. The kinetic profile of scavenging DPPH center dot for PE exhibited one kinetic period characterized by one kinetic constant. The second-order rate constant (k(2)) for the oxidation of PE by DPPH center dot, determined for the first time in this study, was 0.17 dm(3)g(-1)s(-1). The obtained k(2) value was compared to that of synthetic antioxidants and natural extracts used in the food industry. Kinetic analysis of PE antiradical effectiveness showed that the k(2) was within the range values for natural colorants of fruit extracts and should be considered as a fast acting natural antioxidant source. The k(2) parameter indicates the extent of oxidation inhibition that is based on all of the kinetic profiles of DPPH bleaching rather than single point measurements. For this reason, the kinetic analysis should become a necessary step for more precise antioxidative characterization of propolis.
PB  - Research Inst Pomology Floriculture, Div Apiculture, Pulawy
T2  - Journal of Apicultural Science
T1  - Kinetic profile of the antioxidant activity of propolis extract: 2,2-diphenyl-1-picrylhydrazyl radical bleaching assay
EP  - 46
IS  - 1
SP  - 39
VL  - 62
DO  - 10.2478/JAS-2018-0004
ER  - 

@article{
author = "Mirković, Snjezana and Rajković, Katarina and Jeremić, Sanja and Gavrilović, Marijana and Tomić, Ljiljana and Arsić-Arsenijević, Valentina and Krstić, Boro",
year = "2018",
abstract = "The objective of this paper was to assess the antiradical effectiveness of propolis extract (PE) based on 2.2-diphenyl-1-picrylhydrazyl radical (DPPH center dot) bleaching assay kinetic profile. The kinetic profile of scavenging DPPH center dot for PE exhibited one kinetic period characterized by one kinetic constant. The second-order rate constant (k(2)) for the oxidation of PE by DPPH center dot, determined for the first time in this study, was 0.17 dm(3)g(-1)s(-1). The obtained k(2) value was compared to that of synthetic antioxidants and natural extracts used in the food industry. Kinetic analysis of PE antiradical effectiveness showed that the k(2) was within the range values for natural colorants of fruit extracts and should be considered as a fast acting natural antioxidant source. The k(2) parameter indicates the extent of oxidation inhibition that is based on all of the kinetic profiles of DPPH bleaching rather than single point measurements. For this reason, the kinetic analysis should become a necessary step for more precise antioxidative characterization of propolis.",
publisher = "Research Inst Pomology Floriculture, Div Apiculture, Pulawy",
journal = "Journal of Apicultural Science",
title = "Kinetic profile of the antioxidant activity of propolis extract: 2,2-diphenyl-1-picrylhydrazyl radical bleaching assay",
pages = "46-39",
number = "1",
volume = "62",
doi = "10.2478/JAS-2018-0004"
}

Mirković, S., Rajković, K., Jeremić, S., Gavrilović, M., Tomić, L., Arsić-Arsenijević, V.,& Krstić, B.. (2018). Kinetic profile of the antioxidant activity of propolis extract: 2,2-diphenyl-1-picrylhydrazyl radical bleaching assay. in Journal of Apicultural Science
Research Inst Pomology Floriculture, Div Apiculture, Pulawy., 62(1), 39-46.
https://doi.org/10.2478/JAS-2018-0004

Mirković S, Rajković K, Jeremić S, Gavrilović M, Tomić L, Arsić-Arsenijević V, Krstić B. Kinetic profile of the antioxidant activity of propolis extract: 2,2-diphenyl-1-picrylhydrazyl radical bleaching assay. in Journal of Apicultural Science. 2018;62(1):39-46.
doi:10.2478/JAS-2018-0004 .

Mirković, Snjezana, Rajković, Katarina, Jeremić, Sanja, Gavrilović, Marijana, Tomić, Ljiljana, Arsić-Arsenijević, Valentina, Krstić, Boro, "Kinetic profile of the antioxidant activity of propolis extract: 2,2-diphenyl-1-picrylhydrazyl radical bleaching assay" in Journal of Apicultural Science, 62, no. 1 (2018):39-46,
https://doi.org/10.2478/JAS-2018-0004 . .

TY  - JOUR
AU  - Gavrilović, Marijana
AU  - Rajković, Katarina M.
AU  - Simić, Valentina
AU  - Jeremić, Sanja
AU  - Mirković, Snjezana
AU  - Jevtić, Aleksandra S.
PY  - 2018
UR  - https://imagine.imgge.bg.ac.rs/handle/123456789/1128
AB  - The ultrasound-assisted extraction of Juglans nigra L. leaves was optimized with respect to total phenolic content (TP) of the extracts by varying the concentration of aqueous ethanol solution (E) and different solvent-to-solid ratio (S). The influence and optimum of the operating parameters (E and S) was examined using response surface methodology (RSM). The statistical criteria indicated the adequacy, reliability and precision of the developed RSM model. RSM showed that maximum extraction yield of TP 28.59 mg g(-1) of draw plant was achieved at the optimal values of 50% E and 20 kg kg(-1) S. Using the modelled optimized conditions, the detected relative difference between the predicted and the experimental yield was +/- 2.3 %. The determined TP content in the extracts varied from 12.54 to 29.26 mg GAE g(-1) of dry plant indicated that J. nigra is a valuable source of phenolic substances. The extracts of J. nigra leaves obtained under optimal conditions showed good antioxidant activity (IC50 = = 18.91 +/- 0.03 mu g cm(-3)) which was determined by the scavenging effect on 2,2-diphenyl-1-picrylhydrazyl radical. The optimization of the TP extraction process is the important step in improving techno-economics of the potential commercial preparation of J. nigra extracts, as natural source of antioxidants.
PB  - Srpsko hemijsko društvo, Beograd
T2  - Journal of the Serbian Chemical Society
T1  - Optimization of ultrasound-assisted extraction of total polyphenolic compounds from Juglans nigra L. leaves
EP  - 1284
IS  - 11
SP  - 1273
VL  - 83
DO  - 10.2298/JSC180321069G
ER  - 

@article{
author = "Gavrilović, Marijana and Rajković, Katarina M. and Simić, Valentina and Jeremić, Sanja and Mirković, Snjezana and Jevtić, Aleksandra S.",
year = "2018",
abstract = "The ultrasound-assisted extraction of Juglans nigra L. leaves was optimized with respect to total phenolic content (TP) of the extracts by varying the concentration of aqueous ethanol solution (E) and different solvent-to-solid ratio (S). The influence and optimum of the operating parameters (E and S) was examined using response surface methodology (RSM). The statistical criteria indicated the adequacy, reliability and precision of the developed RSM model. RSM showed that maximum extraction yield of TP 28.59 mg g(-1) of draw plant was achieved at the optimal values of 50% E and 20 kg kg(-1) S. Using the modelled optimized conditions, the detected relative difference between the predicted and the experimental yield was +/- 2.3 %. The determined TP content in the extracts varied from 12.54 to 29.26 mg GAE g(-1) of dry plant indicated that J. nigra is a valuable source of phenolic substances. The extracts of J. nigra leaves obtained under optimal conditions showed good antioxidant activity (IC50 = = 18.91 +/- 0.03 mu g cm(-3)) which was determined by the scavenging effect on 2,2-diphenyl-1-picrylhydrazyl radical. The optimization of the TP extraction process is the important step in improving techno-economics of the potential commercial preparation of J. nigra extracts, as natural source of antioxidants.",
publisher = "Srpsko hemijsko društvo, Beograd",
journal = "Journal of the Serbian Chemical Society",
title = "Optimization of ultrasound-assisted extraction of total polyphenolic compounds from Juglans nigra L. leaves",
pages = "1284-1273",
number = "11",
volume = "83",
doi = "10.2298/JSC180321069G"
}

Gavrilović, M., Rajković, K. M., Simić, V., Jeremić, S., Mirković, S.,& Jevtić, A. S.. (2018). Optimization of ultrasound-assisted extraction of total polyphenolic compounds from Juglans nigra L. leaves. in Journal of the Serbian Chemical Society
Srpsko hemijsko društvo, Beograd., 83(11), 1273-1284.
https://doi.org/10.2298/JSC180321069G

Gavrilović M, Rajković KM, Simić V, Jeremić S, Mirković S, Jevtić AS. Optimization of ultrasound-assisted extraction of total polyphenolic compounds from Juglans nigra L. leaves. in Journal of the Serbian Chemical Society. 2018;83(11):1273-1284.
doi:10.2298/JSC180321069G .

Gavrilović, Marijana, Rajković, Katarina M., Simić, Valentina, Jeremić, Sanja, Mirković, Snjezana, Jevtić, Aleksandra S., "Optimization of ultrasound-assisted extraction of total polyphenolic compounds from Juglans nigra L. leaves" in Journal of the Serbian Chemical Society, 83, no. 11 (2018):1273-1284,
https://doi.org/10.2298/JSC180321069G . .

TY  - JOUR
AU  - Rajković, Katarina M.
AU  - Jeremić, Sanja
AU  - Milić, Petar S.
AU  - Kostić, Marina
AU  - Arsić-Arsenijević, Valentina
AU  - Gavrilović, Marijana
AU  - Krstić, Boro
PY  - 2017
UR  - https://imagine.imgge.bg.ac.rs/handle/123456789/1008
AB  - Ultrasound-assisted extraction (US-AE) of total extractive substances from the herb Lady's Bedstraw (Galium verum L.) is useful extraction method for its application in food manufacturing. The effect of different temperatures (T) and solventto-solid ratios (S) on the US-AE extraction yield was studied in this paper. The influence and optimum of the operating parameters (T and S) was investigated using response surface methodology (RSM). The T and S had impact on extraction yield. RSM showed that the optimal extraction parameters, which gave a maximum extraction yield of 18.7%, were T of 40 oC and S of 30 kg kg(-1). Using modeled optimized conditions, detected relative difference between predicted and experimental yield was 3.3 %. RSM successfully predicted optimal parameters and proved as useful tool for standardization of extraction conditions for bioactive components from plants important for food industry.
PB  - Budapest Univ Technology Economics, Budapest
T2  - Periodica Polytechnica-Chemical Engineering
T1  - Optimization of Ultrasound-Assisted Extraction of Total Extractive Substances from Galium verum L
EP  - 205
IS  - 3
SP  - 200
VL  - 61
DO  - 10.3311/PPch.9580
ER  - 

@article{
author = "Rajković, Katarina M. and Jeremić, Sanja and Milić, Petar S. and Kostić, Marina and Arsić-Arsenijević, Valentina and Gavrilović, Marijana and Krstić, Boro",
year = "2017",
abstract = "Ultrasound-assisted extraction (US-AE) of total extractive substances from the herb Lady's Bedstraw (Galium verum L.) is useful extraction method for its application in food manufacturing. The effect of different temperatures (T) and solventto-solid ratios (S) on the US-AE extraction yield was studied in this paper. The influence and optimum of the operating parameters (T and S) was investigated using response surface methodology (RSM). The T and S had impact on extraction yield. RSM showed that the optimal extraction parameters, which gave a maximum extraction yield of 18.7%, were T of 40 oC and S of 30 kg kg(-1). Using modeled optimized conditions, detected relative difference between predicted and experimental yield was 3.3 %. RSM successfully predicted optimal parameters and proved as useful tool for standardization of extraction conditions for bioactive components from plants important for food industry.",
publisher = "Budapest Univ Technology Economics, Budapest",
journal = "Periodica Polytechnica-Chemical Engineering",
title = "Optimization of Ultrasound-Assisted Extraction of Total Extractive Substances from Galium verum L",
pages = "205-200",
number = "3",
volume = "61",
doi = "10.3311/PPch.9580"
}

Rajković, K. M., Jeremić, S., Milić, P. S., Kostić, M., Arsić-Arsenijević, V., Gavrilović, M.,& Krstić, B.. (2017). Optimization of Ultrasound-Assisted Extraction of Total Extractive Substances from Galium verum L. in Periodica Polytechnica-Chemical Engineering
Budapest Univ Technology Economics, Budapest., 61(3), 200-205.
https://doi.org/10.3311/PPch.9580

Rajković KM, Jeremić S, Milić PS, Kostić M, Arsić-Arsenijević V, Gavrilović M, Krstić B. Optimization of Ultrasound-Assisted Extraction of Total Extractive Substances from Galium verum L. in Periodica Polytechnica-Chemical Engineering. 2017;61(3):200-205.
doi:10.3311/PPch.9580 .

Rajković, Katarina M., Jeremić, Sanja, Milić, Petar S., Kostić, Marina, Arsić-Arsenijević, Valentina, Gavrilović, Marijana, Krstić, Boro, "Optimization of Ultrasound-Assisted Extraction of Total Extractive Substances from Galium verum L" in Periodica Polytechnica-Chemical Engineering, 61, no. 3 (2017):200-205,
https://doi.org/10.3311/PPch.9580 . .