Radical-scavenging activities of new hydroxylated ursane triterpenes from cv. Annurca apples

Chem Biodivers. 2005 Jul;2(7):953-8. doi: 10.1002/cbdv.200590072.

Abstract

Two new ursolic acid triterpene derivatives, compounds 2 and 3, have been isolated from cv. Annurca apple fruit, a high-quality apple variety widely cultivated in southern Italy, together with the known 2-oxopomolic acid (1). The new compounds were identified by means of different spectroscopic techniques as 3-epi-2-oxopomolic acid (= (3alpha)-3,19-dihydroxy-2-oxours-12-en-28-oic acid; 2) and (1alpha)-1-hydroxy-3-oxours-12-en-28-oic acid (3). Compounds 1-3 were tested for their radical-scavenging activities with the aid of a 1,1-diphenyl-2-picrylhydrazyl (DPPH) assay (Fig. 2). All three constituents showed activities similar to that of the reference antioxidant alpha-tocopherol (vitamin E).

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Free Radical Scavengers / chemistry*
  • Fruit / chemistry*
  • Malus / chemistry*
  • Molecular Structure
  • Stereoisomerism
  • Triterpenes / chemistry*

Substances

  • 1-hydroxy-3-oxours-12-en-28-oic acid
  • 2-oxopomolic acid
  • Free Radical Scavengers
  • Triterpenes