[Study on chemical constituents in rhizome of Securidaca inappendiculata].

Objective: To study the chemical constituents of Securidaca inappendiculata.

Method: Column chromatographic techniques were applied to isolate constituents. A combination of MS and NMR spectroscopy was used to identify structures of constituents.

Result: Seven compounds were isolated from the CHCl3 fraction and their structures were elucidated as 3, 4-dihydroxybezoic acid (1), 3-hydroxy-4-methoxylbenzoic acid (2), coniferaldehyde (3), 7-hydroxy-1, 2, 3, 8-tetrame thoxyxanthone (4), 1, 3, 8-trihydroxy-4-methoxyxanthone (5), 1, 3, 8-trihydroxy-2-methoxyxanth-one (6), 1, 3, 6-trihydroxy-2,7-dimethoxyxanthone (7).

Conclusion: Compounds 1-6 were isolated for the first time from the genus. The antioxidant activities of compounds 3-6 were assayed by the method of DPPH and compound 3 showed the IC50 value of 4.14 microg x mL(-1).