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Description
Clostridium ljungdahlii is a known electro-active bacteria, which can utilize solid electron donors such as negatively charged electrodes and metallic iron [1]. C. ljungdahlii also can fix CO2 and CO using Wood-Ljungdahl pathway to produce aceate, ethanol, lactate, and 2,3-butanediol [2]. These versatile capabilities of C. ljungdahlii draw attention for industrial application of mitigating CO2 emission during microbial electrosynthesis. In this study, C. ljungdahlii was long-term cultivated with iron as sole electron donor and CO2 as sole carbon source to improve electron uptake from metallic iron. After 13 months of adaptive cultivation, acetate production rates of the two cultures improved 10 and 6.5 times, respectively, compared to the initials. However, individual isolates performed worse than the wild-type on iron and CO2 under both heterotrophic and autotrophic conditions. These results will help us understand how long-term cultivation of an acetogen on iron leads to performance change on the cellular level.
References
- Nevin, K.P., et al., Electrosynthesis of organic compounds from carbon dioxide is catalyzed by a diversity of acetogenic microorganisms. Appl Environ Microbiol, 2011. 77(9): p. 2882-6.
- M Whitham, J., J. J Pawlak, and A. M Grunden, Clostridium ljungdahlii: a review of the development of an industrial biocatalyst. Current Biotechnology, 2016. 5(1): p. 54-70.
| Keywords | Clostridium ljungdahlii, extracellular electron transfer, biological iron oxidation |
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