Determination of the importance of in-mouth release of volatile phenol glycoconjugates to the flavor of smoke-tainted wines

Christine M. Mayr, Mango Parker, Gayle A. Baldock, Cory A. Black, Kevin H. Pardon, Patricia O. Williamson, Markus J. Herderich, I. Leigh Francis

Research output: Contribution to journalArticlepeer-review

64 Scopus citations

Abstract

The volatile phenols guaiacol, 4-methylguaiacol, syringol, 4-methylsyringol, o-, m-, and p-cresol, as well as their glycoconjugates, have previously been shown to be present in elevated concentrations in smoke-tainted wine. Sensory descriptive analysis experiments, with addition of free volatile phenols in combination with their glycosidically bound forms, were used to mimic smoke taint in red wines. The addition of volatile phenols together with glycoconjugates gave the strongest off-flavor. The hydrolysis of glycosidically bound flavor compounds in-mouth was further investigated by in vitro and in vivo experiments. The results indicate that enzymes present in human saliva are able to release the volatile aglycones from their glycoconjugates even under low pH and elevated ethanol conditions, confirming that in-mouth breakdown of monosaccharide and disaccharide glycosides is an important mechanism for smoke flavor from smoke affected wines, and that this mechanism may play an important general role in the flavor and aftertaste of wine.

Original languageEnglish
Pages (from-to)2327-2336
Number of pages10
JournalJournal of Agricultural and Food Chemistry
Volume62
Issue number11
DOIs
StatePublished - Mar 19 2014
Externally publishedYes

Keywords

  • PLS
  • bushfire
  • flavor reconstitution
  • glycosides
  • in-mouth release
  • sensory descriptive analysis
  • smoke taint
  • volatile phenols
  • wine

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