作者:Hiroe Kikuzaki、Yoshiko Miyajima、Nobuji Nakatani
DOI:10.1021/np0705615
日期:2008.5.1
Four new phenolic glycosides, (27hydroxy-3-methoxy-5-allyl)phenyl beta-D-(6-O-E-sinapoyl)glucopyranoside (1), (1'R,5'R)-5-(5-carboxymethyl-2-oxocyclopentyl)-3Z-pentenyl beta-D-(6-O-galloyl)glucopyranoside (2), (S)-alpha-terpinyl [alpha-L-(2-O-galloyl)arabinofuranosyl]-(1 -> 6)-beta-D-glucopyranoside (3), and (R)-alpha-terpinyl [alpha-L-(2-O-galloyl)arabinofuranosyl]-(1 -> 6)-beta-D-glucopyranoside (4), were isolated from the berries of Pimenta dioica together with eight known flavonoids. The structures of 1-4 were elucidated on the basis of MS and NMR data and enzymatic hydrolysis. All four glycosides showed radical - scavenging activity against 1,1-diphenyl-2-picrylhydrazyl (DPPH) radicals.