1984 Volume 31 Issue 10 Pages 661-664
In order to find a new type of baker's yeast which would have sugar tolerance and could expand sweet bun dough sufficiently, 902 strains of yeast isolated from slime fluxes were examined and the baker's yeast Saccharomyces cerevisiae SANK 50981 was used as control. In the screening, small amount of high sugar-content dough containing these yeasts were kneaded and gas production was measured by WARLBURG'S method. Of the strains tested, only one strain, SANK 50268, was superior to S. cerevisiae SANK 50981 with respect to gas production in high sugar-content dough. By its taxonomic characteristics, strain SANK 50268 was identified as Saccharomyces rosei (Guilliermond) Lodder et Kreger-van Rij. Strain SANK 50268 grew well on 54% (w/w) glucose agar medium. By contrast, the baker's yeast S. cerevisiae SANK 50981 did not grow on this agar medium. According to the expansible examination of high sugar-content dough by the method of Japan Yeast-makers Association, S. rosei SANK 50268 gave the same result as the WARLBURG'S method. This yeast was also capable of expansion in high sugarcontent dough containing glucose-fructose mixture instead of sucrose. Recently, S. rosei SANK 50268 was also found to have characteristics of coldtolerance.
