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Effects of Yeast Strains and Fermentation Temperatures in Production of Hydrogen Sulfide During Beer Fermentation  

Kim, Young-Ran (Department of Food Science and Biotechnology and Institute of Life Sciences and Resources, Kyung Hee University)
Moon, Seung-Tae (Department of Food Science and Biotechnology and Institute of Life Sciences and Resources, Kyung Hee University)
Park, Seung-Kook (Department of Food Science and Biotechnology and Institute of Life Sciences and Resources, Kyung Hee University)
Publication Information
Korean Journal of Food Science and Technology / v.40, no.2, 2008 , pp. 238-242 More about this Journal
Abstract
In this study, hydrogen sulfide ($H_2S$) production was examined during beer fermentation using two ale and two lager yeast strains. In the lager yeast fermentation, a large amount of $H_2S$ was produced in the early fermentation stages when the yeast were actively fermenting wort, indicating a positive relationship between the level of H2S production and the yeast growth rate during fermentation. The ale yeasts produced much lower levels of H2S than the lager yeasts. In the lager fermentation, a higher fermentation temperature shortened the fermentation period, but much higher levels of $H_2S$ were produced at higher temperatures. American pilsner lager yeast fermenting at $15^{\circ}C$ produced a relatively high level of $H_2S$ at the end of fermentation, which would require a longer aging time to remove this malodorous volatile sulfur compound. Not including the English ale strain, which produced a higher level of H2S at lower temperatures, the ale yeast produced lower levels of $H_2S$ at lower temperatures, suggesting that each strain has an optimum fermentation temperature for H2S production.
Keywords
beer fermentation; lager yeast; ale yeast; hydrogen sulfide$H_2S$;
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