Abstract
γ-polyglutamic acid (γ-PGA) is a kind of biopolymer with high accessional value, and yeast extract is a crucial raw material for the fermentation of γ-PGA. In this paper, the extraction of yeast extract form the waste beer yeast was optimized. Result showed that, 24-h autolysis at 55 °C with 2% NaCl, 2‰ dextranase and 3‰ complex protease addition, the yield of yeast extract was reached 48.64% (w/w). Then the yeast extract was used in γ-PGA fermentation, and the corresponding γ-PGA yield reached 18.69 g/L with 7.5% yeast extract addition, increased by 290% than that of without yeast extract addition.
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Yu, J., Zhao, L., Li, S., Sun, X., & Liu, X. li. (2018). Research on γ-polyglutamic acid fermentation with extract from waste beer yeast. In Lecture Notes in Electrical Engineering (Vol. 444, pp. 795–801). Springer Verlag. https://doi.org/10.1007/978-981-10-4801-2_82
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