Abstract: In this study,1-diphenyl-2-picrylhydrazyl(DPPH) radical scavenging,［2,2′-azino-bis(3-ethylbenzothiazoline)-6-sulphonic acid］ diamonium salt(ABTS) radical scavenging and ferric reducing antioxidant power(FRAP) assay were used to evaluated the antioxidant activities of the extracts of raw Cassia obtusifolia L.and its different processed products with BHT as positive control.The results showed that the extracts of C.obtusifolia and its different processed products all showed antioxidant activity. The ethyl acetate extract of wine steamed C.obtusifolia showed higher radical scavenging power on DPPH radical(IC₅₀=93.8 μg/mL) than other extracts.The ethyl acetate extract of wine fried C. obtusifolia exhibited the highest radical scavenging power on ABTS radical(IC₅₀=8.1 μg/mL) and ferric reducing antioxidant power(TEAC=319.22 μmol/g).The experimental results indicated that different processing methods of C.obtusifolia affected the antioxidant activity in various degrees.

Key words: Cassia obtusifolia L., antioxidant activity, DPPH, ABTS, FRAP