Reducing power of P. hysterophorus flower extracts. Extracts were prepared in hexane (HX), benzene (BZ), chloroform (CH), ethyl acetate (EA), acetone (AC), ethanol (ET) and water (AQ) as described in materials and methods section. Reducing power was measured at different concentration of extracts (200–1000 μg/ml). Butylated hydroxytoluene (BHT) was used as control. The results are expressed as mean ± SD of three replicates.