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Ferric reducing antioxidant power (FRAP) antioxidant activities of the different plant extracts. Values are expressed as mean ± SD of three replicates. The values labeled with different letters differ 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; BHT: butylated hydroxyl toluene.
