Closing the carbon balance for fermentation by Clostridium thermocellum (ATCC 27405) |
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Authors: | Ellis Lucas D Holwerda Evert K Hogsett David Rogers Steve Shao Xiongjun Tschaplinski Timothy Thorne Phil Lynd Lee R |
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Affiliation: | a Thayer School of Engineering, Dartmouth College, Hanover, NH 03755, USA b Mascoma Corporation, Lebanon, NH 03755, USA c Oak Ridge National Laboratory, Oak Ridge, TN 37830, USA |
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Abstract: | 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. |
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Keywords: | Clostridium thermocellum Carbon Mass balance Consolidated bioprocessing |
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