Antioxidant activity (AOA) was measured using a modified version of the method described by Brand-Williams, Cuvelier, and Berset (1995). Sample (100 mg) was extracted with 1 mL methanol for 2 h and centrifuged at 3000g for 10 min. The supernatant (100 mL) was reacted with 3.9 mL of a 6 105 mol/L of DPPH solution. Absorbance (A) at 515 nm was read at 0 and 30 min using a methanol blank. Antioxidant activity was calculated as % discoloration.