Screening of the Antioxidant Activity of Some Medicinal Plants

항산화활성을 나타내는 약용식물 소재 탐색

  • Published : 2004.04.30

Abstract

Antioxidant activities of water extracts of 20 medicinal plants (1 mg/mL) on peroxidation of linolic acid were evaluated by thiocyanate method, among which 11 showed strong antioxidant activity (> 70%). Higher hydroxy radical scavenging activity (> 60%) were shown in Corner officinalis, Acanthopanax sessiliflorus, and Epimedium koreanum than the other plants. Epimedium koreanum than the other plants extract showed highest superoxide radical scavenging activity (42%). Total polyphenol contents ranged from $2.6\;(Polygonatum\;odoratum){\sim}81.2(Epimedium\;koreanum)\;mg/g$. Direct correlation between the antioxidant activity and polyphenol content (r=0.8) was established through simple regression analysis. $IC_{50}$ for selected four plant extracts, showing highest polyphenol contents and antioxidant activities, were significantly higher than positive control. Total antioxidant activity of vitamin c was significantly lower than those of Acanthopanax sessiliflorus, Epimedium koreanum, and Erythrina variegata. Superoxide radical scavenging activity of Acanthopanax sessiliflorus was similar to BHA. Results suggest water extracts of some medicinal plants could be potential candidates for natural antioxidants.

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