Oxidation of glycerol in the presence of hydrogen peroxide and iron in model solutions and wine. Potential effects on wine color

J Agric Food Chem. 2006 Jun 28;54(13):4668-73. doi: 10.1021/jf053036p.

Abstract

Wine oxidation appears to include the formation of hydroxyl radical (*OH), an exceptionally reactive and thus nonselective compound that might be involved in the production of important aldehydes and ketones. This experiment examined the *OH oxidation of glycerol, a major wine constituent, and thus a likely target of such oxidation, in model wine, generated by hydrogen peroxide and iron catalysis. The oxidation products generated were analyzed as their hydrazones using LC-DAD/MS. Glyceraldehyde and dihydroxyacetone were the main compounds identified, both of which were also observed in naturally aged and *OH-oxidized wines. As anticipated, the presence of ethanol in the model wine did not preclude the formation of these compounds. Additionally, when a young red wine was treated with these oxidation derivatives, a noteworthy increase in color was observed, most likely due to the formation of novel anthocyanin-based structures.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Chromatography, Liquid
  • Color*
  • Glycerol / chemistry*
  • Hydrogen Peroxide / chemistry*
  • Hydroxyl Radical / chemistry
  • Iron / chemistry*
  • Oxidation-Reduction
  • Solutions
  • Spectrometry, Mass, Electrospray Ionization
  • Wine / analysis*

Substances

  • Solutions
  • Hydroxyl Radical
  • Hydrogen Peroxide
  • Iron
  • Glycerol