DPPH radical-scavenging activity will be determined by DPPH assay, as described by Binsan et al. (2008) with a slight modification. The sample (10 g) will be homogenized in 30 ml of distilled water and then made up to 50 ml. The homogenate will be filtered and centrifuged at 5000 rpm for 10 min. The supernatant will be used to measure DPPH radical-scavenging activity. Sample (1.5 ml) will be added to 1.5 ml of 0.15 mM 2,2-diphenyl-1-picrylhydrazyl (DPPH) in methanol. The mixture will be mixed vigorously and allowed to stand at room temperature in the dark for 60 min. The absorbance of the resulting solution will be measured at 517 nm using a UV-1601 spectrophotometer (Shimadzu, Kyoto, Japan). The blank will be prepared in the same manner, except that distilled water used instead of the sample. A standard curve was prepared using ascorbic acid. The activity was expressed as µg ascorbic acid equivalents per gram dry sample.