Winemaking of musts at high osmotic strength by thermotolerant yeasts |
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Authors: | Andrea Caridi Pasquale Crucitti Donatella Ramondino |
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Affiliation: | (1) Dipartimento di Scienze e Tecnologie Agro-Forestali e Ambientali, Università di Reggio Calabria, Piazza San Francesco 7, I-89061 Gallina (RC), Italy |
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Abstract: | Fermentation performance of 15 thermotolerant Saccharomyces cerevisiae in three musts from dried grapes at 25, 30, and 40° brix was studied. When the osmotic strength was increased, the volatile acidity and the SO2 production in the wines also increased: in the must with 40° brix, yeasts produce from 1.63 to 3.65 g acetic acid l–1 and from 40 to 73.6 mg SO2 l–1 due to osmotic stress. From 9.75 to 13.40 ethanol v/v production is observed in must at 30°brix, whereas at 40°brix there is a clear detrimental effect. |
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Keywords: | fermentation performance osmotic stress Saccharomyces cerevisiae thermotolerant strain |
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