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The Antioxidative Effects of Oregano (Origanum majorana L.) Extracts  

Rhim, Tae-Jin (Department of Biotechnology, Sangji University)
Choi, Moo-Young (Department of Food and Nutrition, Sangji University)
Publication Information
Korean Journal of Plant Resources / v.22, no.5, 2009 , pp. 425-430 More about this Journal
Abstract
The objective of this study was to investigate the antioxidative capacity of oregano extracts. Amount of oregano extract at which DPPH radical scavenging activity was inhibited by 50% was $21.8{\mu}g$ as compared to 100% by pyrogallol as a reference. Total antioxidant status was examined by total antioxidant capacity against potent free radical reactions. Total antioxidant capacities of oregano extract at the amounts of 7.5 and $15{\mu}g$ were 15.1 and 31.4 nmol Trolox equivalents, respectively. Oxygen radical absorbance capacities of oregano extract at the amounts of 0.2 and $0.4{\mu}g$ were 1.4 and 2.4 nmol gallic acid equivalents, respectively. Total phenolic contents of oregano extract at the amounts of 30 and $75{\mu}g$ were 40.5 and 83.9 nmol gallic acid equivalents, respectively. The inhibitory effect of oregano extract on lipid peroxidation was examined using rat liver mitochondria induced by $FeSO_4$/ascorbic acid. Oregano extracts at the amounts of 20 and $50{\mu}g$ decreased TBARS level by 20 and 64%, respectively. Thus strong antioxidant effects of oregano extract seem to be due to, at least in part, the prevention against free radicals-induced oxidation, followed by inhibition of lipid peroxidation.
Keywords
Oregano; Radical; Antioxidant; Lipid peroxidation;
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