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Chiral Polyfunctional Thiols and Their Conjugated Precursors upon Winemaking with Five Vitis vinifera Sauvignon blanc Clones

Chen, Liang, Capone, Dimitra L., Tondini, Federico A., Jeffery, David W.
Journal of agricultural and food chemistry 2018 v.66 no.18 pp. 4674-4682
Vitis vinifera, acetates, clones, diastereomers, enantiomers, flavor, grape juice, grapes, stereochemistry, thiols, winemaking, wines, yeasts
Five co-located clones of Sauvignon blanc grapes were fermented under controlled conditions at laboratory-scale to investigate the impact of yeast strain, commercial enzyme, or nutrient addition on the concentrations of enantiomers of 3-sulfanylhexan-1-ol (3-SH) and 3-sulfanylhexyl acetate (3-SHA) in resulting wines. The relationship of these enantiomers with the odorless 3-SH precursors present in diastereomeric forms in grape juice was also examined. Possible variations may have existed due to clone type, not only for the diastereomers of 3-SH precursors in juices but also for the enantiomers of 3-SH and 3-SHA in the resulting wines, although there was no obvious stereochemical relationship between precursors and free thiols. From a flavor enhancement perspective, the use of a commercial enzyme in the juice significantly enhanced 3-SH production for some clones. In contrast, less impact on the production of 3-SH and 3-SHA was seen as a result of yeast strain and nutrient regardless of clone type.