on the basis of scavenging ability of the stable DPPH free radicals, was determined as described by Brand-Williams et al. (1995). Definite volume (50-250 μL) of an extract was taken in the test tubes and triple distilled water was added to make it to 1.0 mL. The 2.0 mL of DPPH solution (0.1 mM in methanol) was added to each test tube, mixed well and incubated at room temperature for 30 min. Absorbance of the mixture was measured at 517 nm using double beam spectrophotometer. Percent inhibition of DPPH radical was calculated by the following equation:
where, A0 referred to the absorbance of the control and A1 of the test sample.