Journal
JOURNAL OF INDUSTRIAL MICROBIOLOGY & BIOTECHNOLOGY
Volume 35, Issue 10, Pages 1117-1122Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s10295-008-0390-1
Keywords
bacterial contamination; ethanol fermentation; lactate-tolerant yeast; lactic acid bacteria
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Funding
- Ministry of Agriculture, Forestry, and Fisheries (MAFF) of Japan
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Contamination of Lactobacillus sp. in the fermentation broth of bioethanol production decreases ethanol production efficiency. Although the addition of lactate to the broth can effectively inhibit the growth of Lactobacillus sp., it also greatly reduces the fermentation ability of Saccharomyces cerevisiae. To overcome this conflict, lactate-tolerant yeast strains were screened. Candida glabrata strain NFRI 3164 was found to exhibit both higher levels of lactate tolerance and fermentation ability. Co-cultivation of C. glabrata was performed with Lactobacillus brevis and Lb. fermentum, which were reported as major contaminating bacteria during bioethanol production, in culture medium containing 2% lactate. Under these culture conditions, the growth of Lactobacillus strains was greatly inhibited, but the ethanol production of C. glabrata was not significantly affected. Our data show the possibility of designing an effective fuel ethanol production process that eliminates contamination by Lactobacillus strains through the combined use of lactate addition and C. glabrata.
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