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Changes in Grape Maturity Induced by Spraying Ethanol

Chervin, Christian and El-Kereamy, Ashraf and Renouf, Vincent and Rohmer, C. and Roques, A. and Garin, Pascal and Guichaoua, L. and Sanvoisin, M. and Roustan, Jean-Paul and Savocchia, S. and Van Heeswijck, R. Changes in Grape Maturity Induced by Spraying Ethanol. (2004) In: 26th International Horticultural Congress : Viticulture - Living with Limitations, 11-17 Aug 2002, Toronto, Canada .

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Official URL: http://www.actahort.org/books/640/

Abstract

Three different ethanol solutions were sprayed onto Cabernet Sauvignon (Vitis vinifera L.) clusters during the ripening period: 2.5, 5 and 10% by volume in water. Controls were sprayed with water alone. Three different times of spraying were also tested: 8, 10 and 13 weeks post-flowering. One of the observed changes was a lower titratable acidity in grape samples at harvest, when the clusters were sprayed with ethanol at 10 weeks, in comparison with controls. The wines made with grapes treated with ethanol after mid-veraison, had higher ODs at 520 nm than did the controls. This may due to a combined effect of red pigment levels and acidity. In addition, following malolactic fermentation, the acidity levels of wines made with ethanoltreated grapes were slightly higher than those made with the control grapes. Spraying ethanol at 13 weeks post-flowering increased the berry weight by 10% at harvest without decreasing the °Brix value. The corresponding wines had similar degrees of alcohol. This observation was made for the first time in 2001.

Item Type:Conference or Workshop Item (Paper)
Additional Information:Published in : Acta Horticulturae, n° 640, pp. 305-311, ISSN : 0567-7572. Thanks to International Society for Horticultural Science editor. The definitive version is available at http://www.actahort.org/index.htm The original PDF of the article can be found at Acta Horticulturae website : http://www.actahort.org/books/640/
Audience (conference):International conference proceedings
Uncontrolled Keywords:
Institution:French research institutions > Institut National de la Recherche Agronomique - INRA
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Other partners > University of Adelaïde (AUSTRALIA)
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Deposited By: Dabernat Séverine

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