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Hydroxyl radical (OH) scavenging potential of the different plant extracts. Values are expressed as mean ± SD of three replicates. In the same concentration the values affected with different letter are significantly different 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.
