No abstract

Increasing glycerol production in low-temperature wine fermentation is of concern for winemakers to improve the quality of wines. The objective of this study was to investigate the effect of 10 different Saccharomyces cerevisiae on the kinetics of production of glycerol, ethanol and the activities of glycerol-3phosphate dehydrogenase (GPD) and alcohol dehydrogenase (ADH) in low-temperature fermentation. Ethanol production was influenced by temperature, and it was slightly higher at 13°C than at 25°C. Glycerol yields were significantly affected by both temperature and strains. More glycerol was produced at 25°C than at 13°C because the activity of GPD was higher at 25°C than at 13°C. Glycerol production of the different yeast strains was up to 3.19 and 3.18 g L À1 at 25 and 13°C, respectively. Therefore, isolating the yeast strains with high glycerol production and adaptation to low-temperature fermentation is still the best method in winemaking.Yeast strains affect glycerol production Y.-T. Gao et al.Significant difference in glycerol production with same yeast strain at different temperatures P < 0.001. *** Significant difference in ethanol production with same yeast strain at different temperatures P < 0.05.