The percentage of the % remaining DPPH against
mg dry extract/mg DPPH was plotted to obtain the
amount of antioxidant necessary to decrease the initial
DPPH concentration by 50% ( EC50), using the exponential model: ln[% DPPH rem] = b[mg antioxidant/
mg DPPH ] + a, where b is the slope and a is the intercept. For each of the extracts, the Antiradical Efficiency,
1/EC50was calculated. Values were also obtained for the
three standards.