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        Protective Ability of Ethanol Extracts of Hypericum scabroides Robson & Poulter and Hypericum triquetrifolium Turra against Protein Oxidation and DNA Damage

        Goksel Kızıl,Murat Kızıl,Bircan Ceken 한국식품과학회 2009 Food Science and Biotechnology Vol.18 No.1

        The present study was conducted to determine the protective ability of the ethanol extracts of Hypericum scabroides Robson & Poulter (HS) and Hypericum triquetrifolium Turra (HT) against the protein oxidation and DNA damage induced by Fenton system. The ability of HS and HT to prevent oxidative damage to bovine serum albumin (BSA) induced by Fe³?+/H₂O₂ and ascorbic acid was investigated. The ethanol extracts of HS and HT at different concentrations (50-1,000 ㎍/㎖) efficiently prevented protein oxidation induced by hydroxy radical as assayed by protein oxidation markers including protein carbonyl formation (PCO) and polyacrylamide gel electrophoresis. The effect of ethanol extracts of HS and HT on DNA cleavage induced by UV-photholysis of H₂O₂ using pBluescript M13+ plasmid DNA were investigated. These extracts significantly inhibited DNA damage induced by reactive oxygen species (ROS). Therefore, HS and HT extracts may be useful in the food industry as effective synthetic antioxidants.

      • KCI등재

        In vitro DNA damage, protein oxidation protective activity and antioxidant potentials of almond fruit (Amygdalus trichamygdalus) parts (hull and drupe) using soxhlet ethanol extraction

        Meydan İsmet,Kizil Göksel,Demir Halit,Ceken Toptanci Bircan,Kizil Murat 경희대학교 융합한의과학연구소 2020 Oriental Pharmacy and Experimental Medicine Vol.20 No.4

        Almond is a nut that is consumed abundantly all over the world. In Turkey, almonds are grown in most parts of the Turkey and the consumption of nuts has become an essential part of healthy life. Almond contain powerful nutrients, which may be related to their fatty acid composition. Therefore, the aim of present study was to investigate the antioxidant potentials and the protective activity of ethanol extraction of Amygdalus trichamygdalus fruit parts (Hull and Drupe) against the lipid peroxidation, oxidative DNA damage and protein oxidation using soxhlet ethanol extraction. To the best of our knowledge, our study can be evaluated as the first report. The total phenolic content was found to be equivalent to 28.16 ± 9.990 μg/g gallic acid extract and the total flavonoid content was equivalent to 8.866 ± 0.208 μg/g quercetin extract. The present study shows that A. trichamygdalus extract have good protective activity against lipid peroxidation in the FeCl2– H2O2 system. The extract also showed a strong DPPH radical scavenging ability in a concentration-dependent manner. At 2000 μg/ml, the DPPH radical scavenging activity was found to be 84.47 ± 0.147%. The protein oxidation was also inhibited by A. trichamygdalus extract. At 2000 μg/ml, A. trichamygdalus extract protected protein oxidation by 76.27 ± 1.14%. In addition, the DNA oxidation damage against OH radicals resulting from H2O2 photolysis was inhibited concentration dependently and DNA damage was suppressed by 50.26 ± 2.6% at 1000 μg/ml concentration. The results suggest that A. trichamygdalus fruit extract have antioxidant activity and protect lipid, protein and DNA against oxidative damage. Therefore, the extract may be useful in the food industry as natural antioxidants.

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