Abstract
AbstractIt has been suggested that cytoplasmic petite mutants of Saccharomyces yeasts might be useful in commercial ethanol production since they are incapable of respiration. The authors have compared the rate and extent of ethanol production in a grande strain of S. uvarum and in a cytoplasmic petite mutant derived from it. Increasing the concentration of O2 in the input gas feed to a continuous culture of the grande beyond 0.17% increased the rate of biomass production at the expense of that of ethanol. In contrast, the rates of production of both biomass and ethanol by a similar culture of the petite increased with increasing O2 up to a level of 0.6% of the input flow. Above that level no further increase was recorded. At no O2 level did the yield or productivity of ethanol by the petite exceed the maximum obtainable with the grande. Batch culture studies demonstrated that the petite was more sensitive to the growth inhibitory effects of ethanol than was its grande parent. This may explain the poorer performance of the mutant strain.
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