Lactobacillus buchneri strain NRRL B-30929 converts a concentrated mixture of xylose and glucose into ethanol and other products |
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Authors: | Siqing Liu Kelly A Skinner-Nemec Timothy D Leathers |
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Institution: | (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 |
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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.
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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Keywords: | Ethanol tolerance Mixed sugar fermentation Xylose Phenotype Microarray Lactobacillus buchneri Lactate |
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