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Antioxidant activities of the methanolic extract and its derived soluble fractions from the leaves of R. oldhamii. a DPPH radical scavenging activity. b Superoxide radical scavenging activity. c Reducing power. d Total phenolic contents. The results are presented as the mean ± SD (n = 3). The bars marked by different letters are significantly different at the level of P < 0.05, according to Scheffe’s test
