Bumaldosides A, B and C from the Leaves of Staphylea bumalda
作者:Hideaki Otsuka、Qian Yu、Katsuyoshi Matsunami
DOI:10.3987/com-09-s(s)22
日期:——
Two new aliphatic diglycosides and a phenolic glucoside (4, 5 and 7) have been isolated from leaves of Staphylea bumalda DC., together with three known compounds, benzyl and phenethyl alcohol glycosides (1 and 2), and zingerone beta-D-glucopyranoside (6). 2-Ethyl-3-methylmaleimide N-glucopyranoside (3) was first isolated as a free form. Their structures were determined on the basis of spectroscopic analysis.
Biotransformation of raspberry ketone and zingerone by cultured cells of Phytolacca americana
The biotransformation of raspberry ketone and zingerone were individually investigated using cultured cells of Phytolacca americana. In addition to (2S)-4-(4-hydroxyphenyl)-2-butanol (2%), (2S)-4-(3,4-dihydroxyphenyl)-2-butanol (5%), 4-[4-beta-D-glucopyranosyloxy)phenyl]-2-butanone (19%), 4-[(3S)-3-hydroxybutyl]phenyl-beta-D-glucopyranoside (23%), and (2S)-4-(4-hydroxyphenyl)but-2-yl-beta-D-glucopyrdnoside (20%), two biotransformation products, i.e., 2-hydroxy-4-[(3S)-3-hydroxybutyl]phenyl-beta-D-glucopyranoside(12%) and 2-hydroxy-5-[(3S)-3-hydroxybutyl]phenyl-beta-D-glucopyranoside (11%), were isolated from suspension cells after incubation with raspberry ketone Or three days. On the other hand, two compounds, i.e., (2S)-4-(4-hydroxy-3-methoxyphenyl)but-2-yl-beta-D-glucopyranoside (17%) and (2S)-2-(beta-D-glucopyranosyloxy)-4-[4-(beta-D-glucopyranosyloxy)-3-methoxyphenyl]butane (16%), together with (2S)-4-(4-hydroxy-3-methoxyphenyl)-2-butanol (15%), 4-[4-(beta-D-glucopyranosyloxy)-3-methoxyphenyt]-2-butanone (21%), and 4-[(3S)-3-hydroxybutyl]-2-methoxyphenyl-beta-D-glucopyranoside (24%) were obtained upon addition of zingerone. Cultured cells of P. americana can reduce, and regioselectively hydroxylate and glucosylate, these food ingredients to their beta-glycosides. (c) 2006 Elsevier Ltd. All rights reserved.