In this study, the antioxidative effects and component analysis for the extracts of Rumex acetosa L. were investigated. All experiments were performed with 50% ethanol extract, ethyl acetate fraction and aglycone fraction obtained from dried R. acetosa L.. Free radical scavenging activities (1,1-diphenyl-2-picrylhydrazyl) size of, in the order of aglycone fraction > ethyl acetate fraction > 50% ethanol extract, aglycone fraction (45.10 µg/mL) showed the highest radical scavenging activity. Reactive oxygen species (ROS) scavenging activity (total antioxidant capacity, OSC 50 ) on ROS generated in Fe
3+-EDTA/H 2 O 2 system was also, in the order of ethyl acetate fraction> aglycone fraction> 50% ethyl acetate fraction, ethyl acetate fraction (2.68 µg/mL) was shown a great antioxidant capacity. The total antioxidant capacity of the ethyl acetate fraction was found to be greater than L-ascorbic acid, known as a typical hydrophilic antioxidant (6.88 µg/mL). The cellular protective effects of R. acetosa L. extracts on the 1 O 2 -induced cellular damage of
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