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General medium for the autotrophic cultivation of acetogens

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Abstract

Syngas fermentation, a microbial process in which synthesis gas serves as a substrate for acetogens, has attracted increasing interest in the last few years. For the purposeful selection of acetogens for various applications, it would be useful to characterize and compare the process performances of as many autotrophic strains as possible under identical process conditions. Unfortunately, all the media compositions so far recommended for syngas fermentation differ considerably with respect to each individual strain. Therefore, a general medium for syngas fermentation was designed. The suitability of this new general-acetogen medium (GA-medium) was proven based on the autotrophic batch cultivation of Acetobacterium fimetarium, Acetobacterium wieringae, Blautia hydrogenotrophica, Clostridium magnum, Eubacterium aggregans, Sporomusa acidovorans, Sporomusa ovata and Terrisporobacter mayombei in anaerobic flasks with an initial gas phase of H2:CO2 (66:34) (P = 200 kPa). A comparison of the autotrophic batch processes with this medium revealed T. mayombei as the bacterium with the highest maximum growth rate of 5.77 day−1 which was more than 10 times higher than the lowest identified maximum growth rate of A. fimetarium. The maximum growth rates of A. wieringae, C. magnum and S. acidovorans were all in the same order of magnitude around 1.7 day−1. The newly designed GA-medium offers the possibility to compare autotrophic process performances of different acetogens under similar conditions absent the effects of various media compositions.

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Acknowledgments

The authors gratefully thank the TUM graduate School (Technische Universität München, Germany) for the support of Anna Groher.

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  1. Institute of Biochemical Engineering, Technische Universität München, Boltzmannstr. 15, 85748, Garching, Germany

    Anna Groher & Dirk Weuster-Botz

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  1. Anna Groher
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  2. Dirk Weuster-Botz
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Correspondence to Dirk Weuster-Botz.

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Groher, A., Weuster-Botz, D. General medium for the autotrophic cultivation of acetogens. Bioprocess Biosyst Eng 39, 1645–1650 (2016). https://doi.org/10.1007/s00449-016-1634-5

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  • DOI: https://doi.org/10.1007/s00449-016-1634-5

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