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Antioxidant effect of different extracts of Cassia fistula bark against (a) DPPH free radical scavenging assay and (b) reducing power assay. Ascorbic acid (AA), butylated hydroxy toluene (BHT), petroleum ether (PE), chloroform (CE), ethyl acetate (EE), methanol (ME), and aqueous extracts (AE).
