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Lactobacillus buchneri strain NRRL B-30929 converts a concentrated mixture of xylose and glucose into ethanol and other products

  • Original Paper
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Journal of Industrial Microbiology & Biotechnology

Abstract

Lactobacillus buchneri strain NRRL B-30929 was isolated from a fuel ethanol production facility. This heterofermentative, facultative anaerobe can utilize xylose as a sole carbon source and tolerates up to 12% ethanol. Carbohydrate utilization (API, Biomerieux) and Phenotype Microarrays™ (PM, Biolog) analyses indicated that the strain is able to metabolize a broad spectrum of carbon sources including various monosaccharides (C5 and C6), disaccharides and oligosaccharides, with better rates under anaerobic conditions. In pH-controlled bioreactors, the bacterium consumed xylose and glucose simultaneously at high concentrations (125 g L−1, pH 6.0). The major fermentation products were lactate (52 g L−1), acetate (26 g L−1) and ethanol (12 g L−1). The strain ferments glucose alone (pH 4.0) into lactate and ethanol with a molar ratio of 1.03:1. This strain will be further explored via genetic engineering for potential applications in biomass conversion.

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Acknowledgments

We thank Jacqueline Zane and Melinda S. Nunnally for their excellent technical assistance.

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Authors and Affiliations

  1. Bioproducts and Biocatalysis Research Unit, National Center for Agricultural Utilization Research, Agricultural Research Service, United States Department of Agriculture, 1815 N. University St, Peoria, IL, 61604, USA

    Siqing Liu, Kelly A. Skinner-Nemec & Timothy D. Leathers

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  1. Siqing Liu
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  2. Kelly A. Skinner-Nemec
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  3. Timothy D. Leathers
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Correspondence to Siqing Liu.

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Names are necessary to report factually on available data; however, the USDA neither guarantees nor warrants the standard of the product, and the use of the names by USDA implies no approval of the product to the exclusion of others that may also be suitable.

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Liu, S., Skinner-Nemec, K.A. & Leathers, T.D. Lactobacillus buchneri strain NRRL B-30929 converts a concentrated mixture of xylose and glucose into ethanol and other products. J Ind Microbiol Biotechnol 35, 75–81 (2008). https://doi.org/10.1007/s10295-007-0267-8

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  • DOI: https://doi.org/10.1007/s10295-007-0267-8

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