Abstract: Tectoridin was successfully isolated from Rhizoma Belamcandae.The antioxidant capacity of isolated tectoridin was examined via some sensitive,simple,effective methods including oxygen radical scavenging,hydroxyl radical scavenging,diphenyl bitterness hydrazine radical scavenging,alkyl radical scavenging and anti-lipid oxidation assays.The results showed that the antioxidant effects of tectoridins is weaker than 2,6-ditertiary butyl-p-cresol,but is stronger than vitamin C.It is suggested that the antioxidant capacity of Tectoridin is more significant.

Key words: antioxidant activity, tectoridin, radicals, 2,6-ditertiary butyl-pcresol, vitamin C