期刊
BIORESOURCE TECHNOLOGY
卷 103, 期 1, 页码 293-299出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2011.09.128
关键词
Clostridium thermocellum; Carbon; Mass balance; Consolidated bioprocessing
资金
- BioEnergy Science Center (BESC), US Department of Energy (DOE) Research Center
- Office of Biological and Environmental Research in the DOE Office of Science and Mascoma Corporation
- Department of Energy [DE-AC05-00OR22725]
Our lab and most others have not been able to close a carbon balance for fermentation by the thermophilic, cellulolytic anaerobe, Clostridium thermocellum. We undertook a detailed accounting of product formation in C. thermocellum ATCC 27405. Elemental analysis revealed that for both cellulose (Avicel) and cellobiose, >= 92% of the substrate carbon utilized could be accounted for in the pellet, supernatant and off-gas when including sampling. However, 11.1% of the original substrate carbon was found in the liquid phase and not in the form of commonly-measured fermentation products - ethanol, acetate. lactate, and formate. Further detailed analysis revealed all the products to be <720 da and have not usually been associated with C. thermocellum fermentation, including malate, pyruvate, uracil, soluble glucans, and extracellular free amino acids. By accounting for these products, 92.9% and 93.2% of the final product carbon was identified during growth on cellobiose and Avicel, respectively. (C) 2011 Elsevier Ltd. All rights reserved.
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