Objective:Study on the chemical constituents from Cibotium barometz and their scavenging activities for 2

2-diphenyl-2-picrylhydrazyl (DPPH) radical. Method: The chemical constituent from70% alcohol extract of C. barometz was isolated on chromatograph of silica gel and sephadex LH-20 and HPLC

their structure were elucidated on the basis of spectra data and the compounds were tested for their scavenging activities on DPPH radical. Result: Ten compounds were purified and their structure were identified as 1-O-caffeyl-D-glucopyranose ( 1 )

6-O-caffeyl-D-glucopyranose ( 2 )

3-O-caffeyl-D-glucopyranose ( 3 )

3-hydroxymethyl-2(5H)-furanone ( 4 )

β-miroside( 5 )

cibotiumbaroside A( 6 )

protocatechuic acid ( 7 )

glucose ( 8 )

mannose ( 9 )

Corchoionoside C ( 10 )

kojic acid ( 11 ). Three isolated compounds showed strong scavenging activities on DPPH radical. Conclusion: Compound 1-5 were isolated for the first time from C. barometz. among of them

compound 1

compound 3 and compound 6 showed significant antioxidant activity

and the scavenging activity of compound 1 was similar to that of Vit C.