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  • Title: Increased ethanol production from sweet sorghum juice concentrated by a membrane separation process.
    Author: Sasaki K, Tsuge Y, Sasaki D, Teramura H, Wakai S, Kawaguchi H, Sazuka T, Ogino C, Kondo A.
    Journal: Bioresour Technol; 2014 Oct; 169():821-825. PubMed ID: 25123981.
    Abstract:
    The aim of this investigation was to attain high ethanol concentration by concentrating sweet sorghum juice using a two-step membrane separation process. Ultrafiltration permeation of the juice was used to remove residues, followed by nanofiltration concentration to increase the sugar concentration. The concentrated juice containing 180.0 g L(-1) sucrose, 59.3 g L(-1) glucose and 49.3 g L(-1) fructose supplemented with nitrogen sources (10 and 20 g L(-1) of yeast extract and polypeptone, respectively) was fermented by Saccharomyces cerevisiae BY4741 to produce 133.5 g L(-1) of ethanol (87.6% of theoretical yield) after 48 h fermentation. Importantly, the addition of lower concentrations of exogenous nitrogen sources (3 and 6 g L(-1) of yeast extract and polypeptone, respectively) or no exogenous nitrogen sources resulted in the production of 131.4 and 132.8 g L(-1) of ethanol (84.8% and 86.0% of theoretical yield), respectively, after 48 h fermentation.
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