Abstract: Very high gravity(VHG) fermentation has a bright future as it can greatly increase the capacity of plant,decrease the labor costs and consumption of energy as well.However,the high concentration of substrate and end product exhibits severe inhibition on the performance of yeast during the process of VHG fermentation.The critical inhibition concentration was confirmed through the analysis and comparison of yeast growth and fermentation performance under different substrate or product concentrations in the fermentation process,while other parameters were controlled.According to the experiments,within the scope of the tested substrate concentration,the strain of yeast can produce up to 55g/L ethanol,and critical inhibition substrate concentration is 160g/L.The end product-ethanol is the primary factor inhibiting the fermentation.The yeast can tolerate the ethanol with concentration up to 70g/L at the beginning of fermentation,and endogenous ethanol shows greater impacts on yeast performance than exogenous one.
张琦,李文,林燕,等. 高浓度发酵中酵母菌性能调控及优化[J]. 食品与发酵工业, 2013, 39(03): 5-11.
Zhang Qi,Li Wen,Lin Yan,et al. Regulation and optimization of yeast performance in very high gravity(VGH) fermentation[J]. Food and Fermentation Industries, 2013, 39(03): 5-11.