Journal
INTERNATIONAL JOURNAL OF FOOD MICROBIOLOGY
Volume 170, Issue -, Pages 83-90Publisher
ELSEVIER
DOI: 10.1016/j.ijfoodmicro.2013.10.019
Keywords
Growth/no growth boundaries; Logistic model; Wine spoilage
Categories
Funding
- Spanish Government [AGL2010-15494]
- Junta de Andalucia [AGR-125, AGR-7755]
- INTA
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The present study uses a probabilistic model to determine the growth/no growth interfaces of the spoilage wine yeast Dekkera bruxellensis CH29 as a function of ethanol (10-15%, v/v), pH (3.4-4.0) and free SO2 (0-50 mg/l) using time (7, 14,21 and 30 days) as a dummy variable. The model, built with a total of 756 growth/no growth data obtained in a simile wine medium, could have application in the winery industry to determine the wine conditions needed to inhibit the growth of this species. Thereby, at 12.5% of ethanol and pH 3.7 for a growth probability of 0.01, it is necessary to add 30 mg/l of free SO2 to inhibit yeast growth for 7 days. However, the concentration of free SO2 should be raised to 48 mg/l to achieve a probability of no growth of 0.99 for 30 days under the same wine conditions. Other combinations of environmental variables can also be determined using the mathematical model depending on the needs of the industry. (C) 2013 Elsevier B.V. All rights reserved.
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