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 hydrolys...able 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.
TY - JOUR
AU - Rakić, S.
AU - Petrović, S.
AU - Kukić, J.
AU - Jadranin, Milka
AU - Tešević, Vele
AU - Povrenović, D.
AU - Šiler-Marinković, S.
PY - 2007
UR - https://cer.ihtm.bg.ac.rs/handle/123456789/362
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.
PB - Elsevier
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 = "Rakić, S. and Petrović, S. and Kukić, J. and Jadranin, Milka and Tešević, Vele and Povrenović, D. and Šiler-Marinković, S.",
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.",
publisher = "Elsevier",
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"
}
Rakić, S., Petrović, S., Kukić, J., Jadranin, M., Tešević, V., Povrenović, D.,& Šiler-Marinković, S.. (2007). Influence of thermal treatment on phenolic compounds and antioxidant properties of oak acorns from Serbia. in Food Chemistry
Elsevier., 104(2), 830-834.
https://doi.org/10.1016/j.foodchem.2007.01.025
Rakić S, Petrović S, Kukić J, Jadranin M, Tešević V, Povrenović D, Šiler-Marinković 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 .
Rakić, S., Petrović, S., Kukić, J., Jadranin, Milka, Tešević, Vele, Povrenović, D., Šiler-Marinković, S., "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 . .
