Antioxidant activities of pomegranate peel methanolic and water extracts by in vitro methods
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Abstract
In this study, the antioxidant activities of pomegranate (Punica granatum) peel extracts were investigated using different antioxidant activity methods. The antioxidant activities of extracts prepared at different concentrations (100-1000 μg/ml) were compared with α-tocopherol, ascorbic acid, BHT, and BHA standards. The methanol extract of peels had the highest yield (45.5%). Chelating activities (Fe2+) of methanol extract at 100-1000 μg/ml concentrations ranged between 16.63 and 46.45%. However, the chelating activities of all test extracts were lower than the standards. The reducing power of all extracts increased concentration-dependent. DPPH˙˙ radical scavenging activity of methanol extract varied in the range of 18.53 to 88.75%. The highest percentage inhibition of linoleic acid oxidation was found in 250 μg/ml concentrations. Trolox equivalent (TEs) antioxidant capacity values of methanol extract ranged from 3.09 to 15.27 µM TEs 10 g-1. It was determined that methanol extract showed a dose-dependent inhibition of the antioxidant activities.
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