mixture was shaken vigorously and maintained for 30 min
in dark. The absorbance was measured at 517 nm. The
absorbance of the control was obtained by replacing the
sample with methanol. Quercetin and BHA were used as
standard reference. The scavenging activity was calculated
using the formula, scavenging activity (%) ¼ [(A517 of
controlA517 of sample)/A517 of control]100.