Regioselective lipase-catalyzed synthesis of 3-o-acyl derivatives of resveratrol and study of their antioxidant properties

J Agric Food Chem. 2010 Jan 27;58(2):807-13. doi: 10.1021/jf903210q.

Abstract

One of the approaches to increasing the bioavailability of resveratrol is to protect its 3-OH phenolic group. In this work, regioselective acylation of resveratrol at 3-OH was achieved by transesterification with vinyl acetate catalyzed by immobilized lipase from Alcaligenes sp. (lipase QLG). The maximum yield of 3-O-acetylresveratrol was approximately 75%, as the lipase also catalyzes its further acetylation affording the diester 3,4'-di-O-acetylresveratrol and finally the peracetylated derivative. Long saturated and unsaturated fatty acid vinyl esters were also effective as acyl donors with similar regioselectivity. In contrast, lipase B from Candida antarctica catalyzes the acylation of the phenolic group 4'-OH with 80% yield and negligible formation of higher esters. The analysis of the antioxidant properties showed that the Trolox equivalent antioxidant capability (TEAC) values for the acetyl and stearoyl derivatives at 3-OH were, respectively, 40% and 25% referred to resveratrol. The addition of an acyl chain in the 3-OH position caused a higher loss of activity compared with that at the 4'-OH.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Alcaligenes / enzymology
  • Antioxidants / chemical synthesis
  • Antioxidants / chemistry*
  • Bacterial Proteins / chemistry*
  • Enzymes, Immobilized / chemistry
  • Fungal Proteins
  • Kinetics
  • Lipase / chemistry*
  • Resveratrol
  • Stilbenes / chemical synthesis
  • Stilbenes / chemistry*
  • Substrate Specificity

Substances

  • Antioxidants
  • Bacterial Proteins
  • Enzymes, Immobilized
  • Fungal Proteins
  • Stilbenes
  • Lipase
  • lipase B, Candida antarctica
  • Resveratrol