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KMID : 0380019950100040370
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Korean Journal of Biotechnology and Bioengineering
1995 Volume.10 No. 4 p.370 ~ p.373
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Improvement of Ethanol Yield by Addition of Acetic Acid and Acetaldehyde in Ethanol Fermentation
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Kim, Jin Hyun/김진현
Yeo, Joo Sang/Yoo, Young Je/여주상/유영제
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Abstract
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The major by-products in ethanol fermentation by Saccharomyces cerevisiae were glycerol, acetaldehyde, acetic acid, lactic acid, and formic acid. The effects of these by-products on the cell growth and ethanol production were studied. By adding acetaldehyde or acetic acid in the fermentation broth, the cell growth decreased while the ethanol production increased. But glycerol and lactic acid had nearly no effects on the cell growth and the ethanol production. Acetic acid and acetaldehyde inhibited the cell growth by diminishing the growth rate as well as by prolonging the lag phase. The ethanol yield increased with the elevation of concentrations of acetic acid and acetaldehyde in the fermentation broth. The maximum ethanol yield was obtained for 3g/P acetic acid and 2g/P acetaldehyde, respectively.
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