The hydroxyl radical scavenging assay was performed on the basis of a literature procedure with a few modifications (Fanet al., 2011). The reaction mixture consisted of 1.0 mL FeSO4(3.5 mM), 0.7 mL H2O2(6 mM), 1.0 mL of series of concentrations ABM extracts and 0.3 mL sodium salicylate (20 mM). The total mixture was incubated at 37◦C for 1 h and the absorbance was measured at 562 nm.