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Food Sci Technol Int

Title:		Amino acids and volatile compounds in wines from Cabernet Sauvignon and Tempranillo varieties subjected to malolactic fermentation in barrels
Author(s):		Hernandez-Orte P; Pena A; Pardo I; Cacho J; Ferreira V;
Address:		"Department of Analytical Chemistry, University of Zaragoza, Zaragoza, Spain. puhernan@unizar.es"
Journal Title:		Food Sci Technol Int
Year:		2012
Volume:		20120229
Issue:		2
Page Number:		103 - 112
DOI:		10.1177/1082013211414762
ISSN/ISBN:		1082-0132 (Print) 1082-0132 (Linking)
Abstract:		"The aim of the present paper is to compare the behaviour of industrial lactic bacteria and indigenous bacteria of the cellar when malolactic fermentation was carried out in barrels. The effects of these bacteria on the concentration of metabolised amino acids during malolactic fermentation and on the composition of volatile compounds both before and after malolactic fermentation are studied. The experiment was performed with wines of the Tempranillo and Cabernet Sauvignon varieties. An analysis has been made of the easily extractable volatile compounds of the wood and the compounds from the grapes, and the action of the yeasts during the alcoholic fermentation. Acetoin and diacetyl decreased during the malolactic fermentation in barrels and the concentrations of furfural and its derivatives were up to 100 times higher in wines not subjected to malolactic fermentation. Most of the volatile phenols increased during the malolactic fermentation in wines of the Tempranillo variety, while only guaiacol (p < 0.05) and t-isoeugenol increased in the Cabernet Sauvignon wines. The decrease in amino acids during the malolactic fermentation depends much more on the variety than on the bacterial strain which carries out the malolactic fermentation"
Keywords:		Amino Acids/*chemistry *Fermentation Food Technology Lactobacillus/*metabolism Malate Dehydrogenase/*metabolism Volatile Organic Compounds/*chemistry Wine/*analysis;
Notes:		"MedlineHernandez-Orte, P Pena, A Pardo, I Cacho, J Ferreira, V eng Research Support, Non-U.S. Gov't 2012/03/02 Food Sci Technol Int. 2012 Apr; 18(2):103-12. doi: 10.1177/1082013211414762. Epub 2012 Feb 29"