Influence of wine-related physicochemical factors on the growth and metabolism of non-<Emphasis Type="Italic">Saccharomyces</Emphasis> and <Emphasis Type="Italic">Saccharomyces</Emphasis> yeasts in mixed culture |
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Authors: | Lucía M Mendoza María C Manca de Nadra Elena Bru Marta E Farías |
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Institution: | (1) Centro de Referencia para Lactobacillus (CERELA), Chacabuco 145, 4000 San Miguel de Tucumán, Argentina;(2) Facultad de Bioquímica, Química y Farmacia, Universidad Nacional de Tucumán, Ayacucho 491, 4000 San Miguel de Tucumán, Argentina |
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Abstract: | The influence of two physicochemical factors involved in winemaking, temperature and SO2, on the kinetics and metabolic behavior of Kloeckera apiculata and Saccharomyces cerevisiae was examined. Highest biomass was reached at 15 and 25°C for K. apiculata and S. cerevisiae, respectively. Pure cultures of K. apiculata died off early with increasing temperature, but in co-culture with S. cerevisiae it showed higher viability and a change in the death curve from exponential to linear. Statistical analysis revealed that
metabolite production was significantly different for the three cultures and also at the different fermentation temperatures.
Besides, the interaction between culture type and temperature was significant. At temperatures from 15 to 30°C the mixed culture
showed similar ethanol and lower acetic acid production compared with a pure culture of K. apiculata. SO2 addition slightly increased survival of the non-Saccharomyces species in pure and mixed cultures. Statistical evaluation indicated that culture type and SO2 addition significantly affected metabolite production, but the interaction between culture and SO2 was not significant. These results contribute to current knowledge of enological factors and their effect on prevalence and
fermentative activities of the composite yeast flora and the statistical significance emphasizes the importance of the combined
influence of the culture type and physicochemical factors on the production of fermentation metabolites. |
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Keywords: | K apiculata Mixed culture Temperature Sulfur dioxide Winemaking |
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