Highly regioselective synthesis of novel aromatic esters of arbutin catalyzed by immobilized lipase from Penicillium expansum
摘要:
Ester derivatives of phenolic glycosides have attracted more attention in food, cosmetic and pharmaceutical industries, due to their potent biological activities. In the present study, a group of novel aromatic esters of arbutin were successfully synthesized by using immobilized lipase from Penicillium expansum with excellent 6'-regioselectivities (>99%) and moderate to excellent isolated yields (68-93%), except for 6'-O-vanilloyl-arbutin and 6'-O-(p-hydroxycinnamoyl)-arbutin with 28% and 34% yields, respectively. Among all the acyl donors tested, the lipase was most active towards vinyl 3-phenylpropionate, while remarkable decrease in the activity was recorded when the phenyl of acyl donors carried the hydroxyl and/or methoxyl. (C) 2010 Published by Elsevier B.V.
A vegetative stigmata therapeutic agent contains as an effective ingredient a human umbilical cord extract which is obtained by the steps of subjecting a human umbilical cord to a physically-destructive treatment such as crushing treatment, ultrasonic treament, repetitive freezing and melting treatment and the like, or to a proteolytic decomposing treatment by the use of acids or enzymes, or to both treatments and then extracting the umbilical cord extract from the destroyed and/or decomposed umbilical cord by a solvent.
作者:L. Verotta、F. Orsini、F. Pelizzoni、G. Torri、C. B. Rogers
DOI:10.1021/np9902237
日期:1999.11.1
The phytochemical investigation of members of the genus Protea afforded a series of polyphenolic compounds (1-5) that were identified by 1D and 2D NMR experiments. Of these, 2-5 are new compounds. Chemical syntheses of 1-3 were performed in order to confirm the structures and to prepare additional material for biological evaluation.