Volume 59, Issue 1 p. 142-147

Free and Bound Volatile Secondary Metabolites of Vitis Vhifera Grape cv. Sauvignon Blanc

MARK A. SEFTON

MARK A. SEFTON

The authors are with The Australian Wine Research Institute, P.O. Box 197, Glen Osmond, SA 5064, Australia.

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I. LEIGH FRANCIS

I. LEIGH FRANCIS

The authors are with The Australian Wine Research Institute, P.O. Box 197, Glen Osmond, SA 5064, Australia.

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PATRICK J. WILLIAMS

PATRICK J. WILLIAMS

The authors are with The Australian Wine Research Institute, P.O. Box 197, Glen Osmond, SA 5064, Australia.

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First published: January 1994
Citations: 83

Sauvignon Blanc juices were generously donated by S. Smith and Son Pty Ltd. We also thank The Grape and Wine Research and Development Corporation for funding this research.

ABSTRACT

Free volatiles, and those hydrolytically released from glycosidic forms, were analyzed for Sauvignon Blanc juices from three successive vintages. Most of the 213 compounds identified were in one of the bio-genetic categories: norisoprenoids, benzene derivatives, monoterpenes or aliphatics. Several have not been previously reported as grape components. Monoterpenes were in lower concentration than normally found in floral grape varieties, but at higher levels than reported in Chardonnay juices. A notable proportion (40–50%) of the bound monoterpenes were monocyclic. Hydration of α-terpineol at pH 3 gave c-4-(1-hydroxy-1-methyIethyl)-1-methyl-r-1-cyclohexanol (cis-p-men-thane-1,8-diol) and t-4-(1-hydroxy-1-methylethyl)-1-methyl-r-1-cy-clohexanol (trans-p-menthane-1,8-diol) as the main products and a low yield of t-4-(1-methylethyl)-r-1-methylcyclohexane-1,4-diol (trans-p-menthane-1,4-diol). These were confirmed as major components of the acid hydrolysates of the bound fraction.