Acceleration of high gravity yeast fermentations by acetaldehyde addition |
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Authors: | Andrew R Barber Marcus Henningsson Neville B Pamment |
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Institution: | (1) Department of Chemical Engineering, University of Melbourne, 3010 Melbourne, Australia |
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Abstract: | In high gravity Saccharomyces cerevisiae fermentations containing 300 g glucose l–1, daily addition of acetaldehyde to a total of 93 mM shortened the time required to ferment the first 250 g glucose l–1 from 790 h to 585 h. Acetaldehyde feeding had no effect on the ethanol yield but increased by 135%, 78% and 77% the final concentrations of 2,3-butanediol, 2-methylpropanol and acetate, while decreasing that of glycerol by 14%. Controlled acetaldehyde feeding has potential as a technique for accelerating high gravity fuel or industrial ethanol fermentations and may be useful in preventing incomplete fermentations. |
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Keywords: | acetaldehyde ethanol high gravity fermentation Saccharomyces cerevisiae stimulation |
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