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Applied and Environmental Microbiology, January 2006, p. 221-227, Vol. 72, No. 1
0099-2240/06/$08.00+0     doi:10.1128/AEM.72.1.221-227.2006
Copyright © 2006, American Society for Microbiology. All Rights Reserved.

Effect of Simultaneous Inoculation with Yeast and Bacteria on Fermentation Kinetics and Key Wine Parameters of Cool-Climate Chardonnay

Delphine Jussier,1,2 Amélie Dubé Morneau,1 and Ramón Mira de Orduña1*

Department of Food Science, University of Guelph, Guelph, Ontario, Canada,1 ENSBANA, Dijon, France2

Received 9 June 2005/ Accepted 27 September 2005

Inoculating grape musts with wine yeast and lactic acid bacteria (LAB) concurrently in order to induce simultaneous alcoholic fermentation (AF) and malolactic fermentation (MLF) can be an efficient alternative to overcome potential inhibition of LAB in wines because of high ethanol concentrations and reduced nutrient content. In this study, the simultaneous inoculation of yeast and LAB into must was compared with a traditional vinification protocol, where MLF was induced after completion of AF. For this, two suitable commercial yeast-bacterium combinations were tested in cool-climate Chardonnay must. The time courses of glucose and fructose, acetaldehyde, several organic acids, and nitrogenous compounds were measured along with the final values of other key wine parameters. Sensory evaluation was done after 12 months of storage. The current study could not confirm a negative impact of simultaneous AF/MLF on fermentation success and kinetics or on final wine parameters. While acetic acid concentrations were slightly increased in wines after simultaneous AF/MLF, the differences were of neither practical nor legal significance. No statistically significant differences were found with regard to the final values of pH or total acidity and the concentrations of ethanol, acetaldehyde, glycerol, citric and lactic acids, and the nitrogen compounds arginine, ammonia, urea, citrulline, and ornithine. Sensory evaluation by a semiexpert panel confirmed the similarity of the wines. However, simultaneous inoculation led to considerable reductions in overall fermentation durations. Furthermore, differences of physiological and microbiological relevance were found. Specifically, we report the vinification of "super-dry" wines devoid of glucose and fructose after simultaneous inoculation of yeast and bacteria.

* Corresponding author. Mailing address: Dept. of Food Science, University of Guelph, Guelph, Ontario N1G 2W1, Canada. Phone: (519) 824-4120, ext. 54603. Fax: (519) 824-6631. E-mail: rmira{at}uoguelph.ca

Applied and Environmental Microbiology, January 2006, p. 221-227, Vol. 72, No. 1
0099-2240/06/$08.00+0     doi:10.1128/AEM.72.1.221-227.2006
Copyright © 2006, American Society for Microbiology. All Rights Reserved.





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