Evaluation of the Alkaline Methylene Blue Staining Method for Yeast Activity Determination

概要

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To ensure reliable manufacture of high quality beer, the brewing yeast must be maintained in a highly active state. The conventional methylene blue staining method, which is very simple but not highly sensitive, has been improved to allow sensitive measurement of yeast activity. Two kinds of yeast with different activity levels were stained with methylene blue solution with pH levels between 4 and 12. The results showed that highly sensitive measurement of yeast activity was possible when the staining solution was alkaline. When cells were stained with methylene blue solution with a pH of 10.6 at 25℃ for 15min (the alkaline methylene blue staining method), the percentage of unstained cells was consistent with viability measurements made using the slide culture method. The alkaline methylene blue staining method makes possible sensitive, quick, and simple measurement of yeast activity, which is essential to the management of fermentation process.
社団法人日本生物工学会の論文
1994-09-25