tract, flavonoids, and EDTA are shown in Fig. 4A. In this study, DPPH radical-scavenging method was used to as-
As can be seen in Fig. 4A, crude extract, and isolated compounds sess potential radical-scavenging activities of crude extract, isolated
2 exhibited marked chelation of ferrous ion at all used concentra- compounds (1, 2 and 3), and standard compounds (BHT, BHA, and a- tions (p < 0.01). On the other hand, the percentages of ferrous ions tocopherol). DPPH is a stable free radical and accepts an electron or
(Fe2+) chelating capacity of the same concentration (30 lg/ml) of hydrogen radical to become a stable diamagnetic molecule.