activityDPPH is a stable free radical and has been widely used to assess the ability of compounds or plant extracts to act as free radical scavenging activity or hydrogen donors (Hatano et al., 1989).In the DPPH scavenging tests, TBBE, quercetin, isoquercetin and rutin scavenged 63.02 ± 4.69%, 93.45 ± 0.38%, 71.48 ± 4.37%, and51.08 ± 4.48%, respectively, at the concentration of 12.5 g/mL(Fig. 3). However, when the concentration was at 25 g/mL, they