2024 Volume 23 Issue 1 Pages 4-10
In this study, a Gifu University yeast, strain GY115, was bred for ale beer brewing and its fermentation characteristics were evaluated. Strain GY115, which belongs to the sake yeast group, had high growth and fermentation abilities for maltose. In addition, strain GY115-a3M, a mutant strain adapted to high maltose conditions, demonstrated excellent fermentation ability even in a wort medium with added hops. In the early stages, its fermentation ability was significantly higher than that of the ale yeast strain US-05. Furthermore, in an ale beer brewing test using wort, strain GY115-a3M was shown to brew an ale beer with a fruity flavor, similar to that of Japanese sake. From these results, we propose that strain GY115-a3M has a high potential for brewing both ale beer and Japanese sake.
