(Bougatef et al. 2010). Briefly, a sample aliquot (60 ll) was mixed with 60 ll 0.1 mM DPPH in 95 % aqueous ethanol. After 20 min in the dark, the OA517 was measured; 95 % (v/v) ethanol served as the blank control. Antioxidant activity was evaluated as %-inhibition of DPPH by the following equation: Scavenging activity ð%Þ ¼ ð Þ A0 AS =A0 100; where A0 is the blank control absorbance and AS is the
sample absorbance.