Editor: Patrizia Romano
Production of fermentation aroma compounds by Saccharomyces cerevisiae wine yeasts: effects of yeast assimilable nitrogen on two model strains
Article first published online: 11 JUL 2008
© 2008 Federation of European Microbiological Societies. Published by Blackwell Publishing Ltd. All rights reserved
FEMS Yeast Research
Special Issue: THEMATIC ISSUE: Alcoholic fermentation: beverages to biofuel
Volume 8, Issue 7, pages 1196–1207, November 2008
How to Cite
Carrau, F. M., Medina, K., Farina, L., Boido, E., Henschke, P. A. and Dellacassa, E. (2008), Production of fermentation aroma compounds by Saccharomyces cerevisiae wine yeasts: effects of yeast assimilable nitrogen on two model strains. FEMS Yeast Research, 8: 1196–1207. doi: 10.1111/j.1567-1364.2008.00412.x
- Issue published online: 15 OCT 2008
- Article first published online: 11 JUL 2008
- Received 18 November 2007; revised 5 June 2008; accepted 6 June 2008.First published online 11 July 2008.
- Saccharomyces cerevisiae;
- assimilable nitrogen;
- fermentation aroma compounds
The contribution of yeast fermentation metabolites to the aromatic profile of wine is well documented; however, the biotechnological application of this knowledge, apart from strain selection, is still rather limited and often contradictory. Understanding and modeling the relationship between nutrient availability and the production of desirable aroma compounds by different strains must be one of the main objectives in the selection of industrial yeasts for the beverage and food industry. In order to overcome the variability in the composition of grape juices, we have used a chemically defined model medium for studying yeast physiological behavior and metabolite production in response to nitrogen supplementation so as to identify an appropriate yeast assimilable nitrogen level for strain differentiation. At low initial nitrogen concentrations, strain KU1 produced higher quantities of esters and fatty acids whereas M522 produced higher concentrations of isoacids, γ-butyrolactone, higher alcohols and 3-methylthio-1-propanol. We propose that although strains KU1 and M522 have a similar nitrogen consumption profile, they represent useful models for the chemical characterization of wine strains in relation to wine quality. The differential production of aroma compounds by the two strains is discussed in relation to their capacity for nitrogen usage and their impact on winemaking. The results obtained here will help to develop targeted metabolic footprinting methods for the discrimination of industrial yeasts.