Journal
BIORESOURCE TECHNOLOGY
Volume 98, Issue 15, Pages 2824-2828Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2006.08.026
Keywords
ethanol; Zymomonas mobilis; sugar cane molasses; factorial design
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Fermentations utilizing strains of Zymomonas mobilis, in place of the traditional yeasts, have been proposed due their ethanol yields being close to theoretical. Ethanol production from sugar cane molasses was analyzed under different culture conditions using Z. mobilis in batch fermentation. The total reducing sugars (TRS) concentrations in the molasses, temperature, agitation and culture time effects were studied simultaneously through factorial design. The best conditions for ethanol production were 200 g L-1 of total reducing sugars in the molasses, temperature of 30 degrees C and static culture and time of fermentation of 48 h, achieving 55.8 g L-1. The pH of the medium was kept constant during the experiments, showing that molasses presents a buffering effect. (C) 2006 Elsevier Ltd. All rights reserved.
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