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Conventional baker's yeast converts sugars in dough into CO2 and ethanol to a significant extent when the dough is stored for days at 5 degrees C. We have isolated Csf (cold-sensitive fermentation) mutants of a commercial baker's yeast by a selection method including as the critical step a nystatin treatment to mutagenized cells at 10 degrees C in the presence of antimycin A. The fermentative activity of mutant strain CSF3 was substantially zero at 5 degrees C and one-fifth that of the parent at 10 degrees C but was restored to the same level as the parental activity at 25 to 40 degrees C. In contrast with the parent, the mutant strain normally produced white bread dough and butter roll dough even after the dough was stored for a week at 5 degrees C.

Isolation of a cold-sensitive fermentation mutant of a baker's yeast strain and its use in a refrigerated dough process