TY  - JOUR
AU  - Zdunić, Gordana
AU  - Gođevac, Dejan
AU  - Šavikin, Katarina
AU  - Novaković, Miroslav M.
AU  - Milosavljević, Slobodan M.
AU  - Petrović, Silvana
PY  - 2011
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/1148
AB  - The chemical composition and free radical scavenging properties of the MeOH extract of Hypericum richeri and its subsequent CHCl3, n-BuOH, EtOAc and aqueous extracts were investigated. Four quercetin-3-O-glycosides, three myricetin-3-O-glycosides, 3-O- and 5-O-caffeoylquinic acid, quercetin, I3,II8-biapigenin, pseudohypericin and hypericin were identified. The constituents of the extracts were quantified using HPLC-DAD (high-performance liquid chromatography-diode array detector). Isolation of the compounds from n-BuOH and EtOAc extracts was conducted by column chromatography. Antioxidant capacity of the extracts was evaluated by superoxide radical and ABTS root+ scavenging assays and inhibition of lipid peroxidation. The EtOAc extract of H. richeri was the most potent antioxidant in all experiments. Free radical scavenging compounds were identified by HPLC-DPPH root (high-performance liquid chromatography-2,2-diphenyl-1-picrylhydrazyl) post-column derivatisation method, where all phenolic compounds except I3,II8-biapigenin exhibited radical scavenging properties. This is the first report of the presence of myricetin-3-O-rutinoside, myricetin-3-O-galactoside, myricetin-3-O-glucoside, 5-O-caffeoylquinic acid and I3,II8-biapigenin in H. richeri.
PB  - Taylor & Francis Ltd, Abingdon
T2  - Natural Product Research
T1  - Isolation and identification of phenolic compounds from Hypericum richeri Vill. and their antioxidant capacity
VL  - 25
IS  - 3
SP  - 175
EP  - 187
DO  - 10.1080/14786410802401390
ER  - 

@article{
author = "Zdunić, Gordana and Gođevac, Dejan and Šavikin, Katarina and Novaković, Miroslav M. and Milosavljević, Slobodan M. and Petrović, Silvana",
year = "2011",
abstract = "The chemical composition and free radical scavenging properties of the MeOH extract of Hypericum richeri and its subsequent CHCl3, n-BuOH, EtOAc and aqueous extracts were investigated. Four quercetin-3-O-glycosides, three myricetin-3-O-glycosides, 3-O- and 5-O-caffeoylquinic acid, quercetin, I3,II8-biapigenin, pseudohypericin and hypericin were identified. The constituents of the extracts were quantified using HPLC-DAD (high-performance liquid chromatography-diode array detector). Isolation of the compounds from n-BuOH and EtOAc extracts was conducted by column chromatography. Antioxidant capacity of the extracts was evaluated by superoxide radical and ABTS root+ scavenging assays and inhibition of lipid peroxidation. The EtOAc extract of H. richeri was the most potent antioxidant in all experiments. Free radical scavenging compounds were identified by HPLC-DPPH root (high-performance liquid chromatography-2,2-diphenyl-1-picrylhydrazyl) post-column derivatisation method, where all phenolic compounds except I3,II8-biapigenin exhibited radical scavenging properties. This is the first report of the presence of myricetin-3-O-rutinoside, myricetin-3-O-galactoside, myricetin-3-O-glucoside, 5-O-caffeoylquinic acid and I3,II8-biapigenin in H. richeri.",
publisher = "Taylor & Francis Ltd, Abingdon",
journal = "Natural Product Research",
title = "Isolation and identification of phenolic compounds from Hypericum richeri Vill. and their antioxidant capacity",
volume = "25",
number = "3",
pages = "175-187",
doi = "10.1080/14786410802401390"
}

Zdunić, G., Gođevac, D., Šavikin, K., Novaković, M. M., Milosavljević, S. M.,& Petrović, S.. (2011). Isolation and identification of phenolic compounds from Hypericum richeri Vill. and their antioxidant capacity. in Natural Product Research
Taylor & Francis Ltd, Abingdon., 25(3), 175-187.
https://doi.org/10.1080/14786410802401390

Zdunić G, Gođevac D, Šavikin K, Novaković MM, Milosavljević SM, Petrović S. Isolation and identification of phenolic compounds from Hypericum richeri Vill. and their antioxidant capacity. in Natural Product Research. 2011;25(3):175-187.
doi:10.1080/14786410802401390 .

Zdunić, Gordana, Gođevac, Dejan, Šavikin, Katarina, Novaković, Miroslav M., Milosavljević, Slobodan M., Petrović, Silvana, "Isolation and identification of phenolic compounds from Hypericum richeri Vill. and their antioxidant capacity" in Natural Product Research, 25, no. 3 (2011):175-187,
https://doi.org/10.1080/14786410802401390 . .

TY  - JOUR
AU  - Rakic, Sveto
AU  - Petrović, Silvana
AU  - Kukic, Jelena
AU  - Jadranin, Milka
AU  - Tešević, Vele
AU  - Povrenovic, Dragan
AU  - Siler-Marinkovic, Slavica
PY  - 2007
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/836
AB  - The aim of the present work was to investigate and compare phenolic compounds and antioxidant activity of methanol extracts of Quercus robur and Quercus cerris acorn kernels obtained before and after thermal treatment. Content of total phenolics, tannins, non-tannin phenolics and flavonoids was determined spectrophotometrically and content of gallic acid with HPLC. Antioxidant activity of the samples was assayed through FRAP (Ferric Reducing Antioxidant Power), DPPH scavenging test and inhibition of Fe2+/ascorbate induced lipid peroxidation. Extracts of native and thermally treated kernels showed high antioxidant activity, with extracts of thermally treated kernels being more active than extracts of native ones. Hydrolysable tannins and gallic acid were identified in all samples. Non-tannin phenolics, including gallic acid, were present in significantly higher quantities in thermally treated samples, whilst tannin content decreased. This indicates that during thermal treatment hydrolysable tannins were degraded. As the result of this degradation and consequent increase of non-tannin phenolics content, and amongst them especially gallic acid, thermally treated samples possess higher antioxidant activity than do the native ones. The obtained results have provided further grounds for establishing Q. robur and Q. cerris acorn kernels as a source for functional food preparation, (C) 2007 Elsevier Ltd. All rights reserved.
PB  - Elsevier Sci Ltd, Oxford
T2  - Food Chemistry
T1  - Influence of thermal treatment on phenolic compounds and antioxidant properties of oak acorns from Serbia
VL  - 104
IS  - 2
SP  - 830
EP  - 834
DO  - 10.1016/j.foodchem.2007.01.025
ER  - 

@article{
author = "Rakic, Sveto and Petrović, Silvana and Kukic, Jelena and Jadranin, Milka and Tešević, Vele and Povrenovic, Dragan and Siler-Marinkovic, Slavica",
year = "2007",
abstract = "The aim of the present work was to investigate and compare phenolic compounds and antioxidant activity of methanol extracts of Quercus robur and Quercus cerris acorn kernels obtained before and after thermal treatment. Content of total phenolics, tannins, non-tannin phenolics and flavonoids was determined spectrophotometrically and content of gallic acid with HPLC. Antioxidant activity of the samples was assayed through FRAP (Ferric Reducing Antioxidant Power), DPPH scavenging test and inhibition of Fe2+/ascorbate induced lipid peroxidation. Extracts of native and thermally treated kernels showed high antioxidant activity, with extracts of thermally treated kernels being more active than extracts of native ones. Hydrolysable tannins and gallic acid were identified in all samples. Non-tannin phenolics, including gallic acid, were present in significantly higher quantities in thermally treated samples, whilst tannin content decreased. This indicates that during thermal treatment hydrolysable tannins were degraded. As the result of this degradation and consequent increase of non-tannin phenolics content, and amongst them especially gallic acid, thermally treated samples possess higher antioxidant activity than do the native ones. The obtained results have provided further grounds for establishing Q. robur and Q. cerris acorn kernels as a source for functional food preparation, (C) 2007 Elsevier Ltd. All rights reserved.",
publisher = "Elsevier Sci Ltd, Oxford",
journal = "Food Chemistry",
title = "Influence of thermal treatment on phenolic compounds and antioxidant properties of oak acorns from Serbia",
volume = "104",
number = "2",
pages = "830-834",
doi = "10.1016/j.foodchem.2007.01.025"
}

Rakic, S., Petrović, S., Kukic, J., Jadranin, M., Tešević, V., Povrenovic, D.,& Siler-Marinkovic, S.. (2007). Influence of thermal treatment on phenolic compounds and antioxidant properties of oak acorns from Serbia. in Food Chemistry
Elsevier Sci Ltd, Oxford., 104(2), 830-834.
https://doi.org/10.1016/j.foodchem.2007.01.025

Rakic S, Petrović S, Kukic J, Jadranin M, Tešević V, Povrenovic D, Siler-Marinkovic S. Influence of thermal treatment on phenolic compounds and antioxidant properties of oak acorns from Serbia. in Food Chemistry. 2007;104(2):830-834.
doi:10.1016/j.foodchem.2007.01.025 .

Rakic, Sveto, Petrović, Silvana, Kukic, Jelena, Jadranin, Milka, Tešević, Vele, Povrenovic, Dragan, Siler-Marinkovic, Slavica, "Influence of thermal treatment on phenolic compounds and antioxidant properties of oak acorns from Serbia" in Food Chemistry, 104, no. 2 (2007):830-834,
https://doi.org/10.1016/j.foodchem.2007.01.025 . .