The scavenging ability of extracts (0e30 mg/mL) on DPPH radicals
was determined according to the method of Shimada,
Fujikawa, Yahara, and Nakamura (1992). The effective concentration
(mg/mL) at 50% (EC50) is the concentration at which DPPH
radicals was scavenged by 50%, and was obtained by interpolation
from linear regression analysis. Each analysis was carried out in
triplicate.