Yeast autolysis is strongly influenced by temperature and pH. In wine, the process occurs at low pHs (3 to
4), and at relatively low temperatures, e.g., 15 to 18°C, and also in the presence of ethanol. These
conditions are less than ideal for autolysis, and the autolytic process is likely to occur at a much slower rate.
By permitting the wine to be in contact with the yeast for a longer period, a winemaker can secure the
beneficial effects of autolysis.