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Am. J. Enol. Vitic. 46:4:419-423 (1995)
Copyright © 1995 by the American Society for Enology and Viticulture.
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Stereoisomers of ß-Methyl-ggr-Octalactone. I. Quantification in Brandies as a Function of Wood Origin and Treatment of the Barrels

E. Guichard 1, N. Fournier 1, G. Masson 2, and J.-L. Puech 2

1 INRA, Laboratoire de Recherches sur les Aômes, 17 Rue Sully, F-21034 Dijon Cedex, France
2 INRA, Institut des Produits de la Vigne, Laboratoire des Polymères et des Techniques Physico-chimiques, Place Viala, F-34060 Montpellier Cedex 1, France.

The four stereoisomers of oak lactone (ß-methyl-ggr-octalactone) were quantified in different brandies by using multidimensional GC analysis. For most of the brandies, the oak origin, the heat treatment and charring of the barrels, the alcoholic content, and the aging are known. The only (3S, 4S) and (3S, 4R) stereoisomers of oak lactone were found in brandies. This study points out the influence of the origin of the wood for the amount of oak lactone. Brandies matured in barrels made with American white oak contain a greater amount of (3S, 4S)-oak lactone than those matured in barrels made with Quercus robur L. Toasting and charring of the barrels did not modify the enantiomeric ratios.

Key words: oak lactone, ß-methyl-ggr-octalactone, chirality, multidimensional gas chromatography, brandy, barrel, toasting, charring

Submitted on June 2, 1994






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Copyright © 1995 by the American Society for Enology and Viticulture.