The reducing power of the crude and fractionated extracts and the standards at various concentrations. The concentrations of the crude and fractionated extracts were 1000, 500, 250, 125, 62.5, 31.25 and 15.625 μg/ml. Butylated hydroxyanisole and ascorbic acid were used as the standards. Values expressed are means ± standard deviation of triplicate measurements. PM., crude methanol extract, PH., hexane fraction, PE., ethyl acetate fraction, PW., water fraction, BHA., butylated hydroxyanisole, AA., ascorbic acid.