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Interactions between Storage Temperature and Ethanol that Affect Growth of Brettanomyces bruxellensis in Merlot Wine

Taylor A. Oswald, Charles G. Edwards
Am J Enol Vitic. April 2017 68: 188-194; published ahead of print January 06, 2017 ; DOI: 10.5344/ajev.2017.16102
Taylor A. Oswald
1Mark Ryan Winery, Walla Walla, WA 99362
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Charles G. Edwards
2School of Food Science, Washington State University, Pullman, WA 99164-6376
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  • For correspondence: edwardsc@wsu.edu
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Abstract

The potential for synergy between temperature and ethanol as a means to control infections by Brettanomyces bruxellensis in red wines was studied. Using a commercially prepared Merlot wine, we employed a 4 × 5 factorial experimental design with storage temperature (12, 15, 18, or 21°C) and ethanol (12, 13, 14, 15, or 16% [v/v]) as variables. Culturabilities of two B. bruxellensis strains (I1a and F3) isolated from Washington wines (I1a and F3) were monitored for 100 days before concentrations of volatile acidity, 4-ethylphenol (4-EP), and 4-ethylguaiacol (4-EG) were quantified. While growth of both strains was observed in 12 to 15% (v/v) ethanol, lag phase duration generally increased with a decrease in temperature. The two strains displayed similar growth patterns under the various temperature × ethanol conditions, except in the wines containing 15% (v/v) ethanol. At this concentration, F3 exhibited less growth and reduced concentrations of volatile acidity, 4-EP, and 4-EG at the higher temperatures (18 and 21°C) than did I1a. In fact, F3 grew better at 18°C than at 21°C at 15% ethanol. Culturabilities of both strains quickly declined in wines containing 16% v/v ethanol. Wines in which B. bruxellensis reached >106 cfu/mL frequently contained concentrations of 4-EP and 4-EG in excess of 1290 and 155 μg/L, respectively, and thus above the olfactory thresholds for the two compounds. Given the significant interactions between temperature and ethanol, wines containing >13% (v/v) ethanol should be stored at ≤12°C to help limit spoilage by this yeast.

  • aging
  • Brettanomyces
  • ethanol
  • temperature
  • wine
  • ©2017 by the American Society for Enology and Viticulture
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Interactions between Storage Temperature and Ethanol that Affect Growth of Brettanomyces bruxellensis in Merlot Wine
Taylor A. Oswald, Charles G. Edwards
Am J Enol Vitic.  April 2017  68: 188-194;  published ahead of print January 06, 2017 ; DOI: 10.5344/ajev.2017.16102

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Interactions between Storage Temperature and Ethanol that Affect Growth of Brettanomyces bruxellensis in Merlot Wine
Taylor A. Oswald, Charles G. Edwards
Am J Enol Vitic.  April 2017  68: 188-194;  published ahead of print January 06, 2017 ; DOI: 10.5344/ajev.2017.16102
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