The antiradical activity was determined by spectrophotometry in 1 cm disposable plastic cells. 40 lL of sample or standard (diluted 1/10 with methanol, reaching a concentration range of 100–300 mg gallic acid/L) were added to 1.460 mL of DPPH solution (40 mg/L) in methanol, and left to stand in the dark (Brand-Williams, Cuvelier, & Berset, 1995). The absorbance at 515 nm was measured at the beginning (At=0) and after 240 min (At=240 min), when the reaction reached the steady state. The inhibition percentage was calculated as follows: