Sulfur aroma precursor present in S-glutathione conjugate form: identification of S-3-(hexan-1-ol)-glutathione in must from Vitis vinifera L. cv. Sauvignon blanc.
When Sauvignon blanc or Gros Manseng grape must was percolated through an immobilized gamma-glutamyltranspeptidase column, there was a significant increase in the concentration of S-3-(hexan-1-ol)-L-cysteine, the precursor of 3-mercaptohexan-1-ol, a compound that contributes to the varietal aroma of wines made from these grapes. Low- and high-resolution liquid secondary ion mass sepectrometry (LSIMS) analyses established the presence of S-3-(hexan-1-ol)-glutathione in Sauvignon blanc must. The identification of this compound suggests that the S-3-(hexan-1-ol)-L-cysteine in grapes is produced by the catabolism of S-3-(hexan-1-ol)-glutathione. As is the case in other plant or animal organisms, S-glutathione conjugates may be involved in certain detoxification systems in vines.
Peyrot Des Gachons
Catherine
C
Faculté d'oenologie, Université Victor Segalen Bordeaux 2, 351 cours de la Libération, 33405 Talence Cedex France.
Tominaga
Takatoshi
T
Dubourdieu
Denis
D
D002853:Chromatography, Liquid; D004800:Enzymes, Immobilized; D005978:Glutathione / Q000031:analogs & derivatives / Q000032:analysis* / Q000737:chemistry*; D013058:Mass Spectrometry; D009812:Odorants; D013455:Sulfur / Q000737:chemistry*; D027843:Vitis / Q000737:chemistry*; D014920:Wine / Q000032:analysis*; D005723:gamma-Glutamyltransferase
D004800:Enzymes, Immobilized; C463489:S-3-(hexan-1-ol)gluathione; D013455:Sulfur; D005723:gamma-Glutamyltransferase; D005978:Glutathione