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The 2,2-azinobis(3-ethylbenzthiazoline)-6-sulfonic acid (ABTS) scavenging potential of the different plant extracts. Values are expressed as mean ± SD of three replicates. In the same concentration the values labeled with different letters differ significantly at p < 0.05. EEE: H. zenkeri (bark) ethanolic extract; EFE: H. zenkeri (leaves) ethanolic extract; EEH: H. zenkeri (bark) hydro-ethanolic extract; EFH: H. zenkeri (leaves) hydro-ethanolic extract; Vit C: Vitamin C.
