Abstract
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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Acknowledgments
This work was supported by the project for the development of biomass utilization technologies for revitalizing rural areas from the Ministry of Agriculture, Forestry, and Fisheries (MAFF) of Japan. We thank S. Mizukami-Murata and Y. Sakayori (National Food Research Institute) for their technical assistance in this study.
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Watanabe, I., Nakamura, T. & Shima, J. A strategy to prevent the occurrence of Lactobacillus strains using lactate-tolerant yeast Candida glabrata in bioethanol production. J Ind Microbiol Biotechnol 35, 1117–1122 (2008). https://doi.org/10.1007/s10295-008-0390-1
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DOI: https://doi.org/10.1007/s10295-008-0390-1