Abstract
Bacterial fermentation of lignocellulose has been regarded as a sustainable approach to butyric acid production. However, the yield of butyric acid is hindered by the conversion efficiency of hydrolysate xylose. A mesophilic alkaline-tolerant strain designated as Clostridium butyricum B10 was isolated by xylose fermentation with acetic and butyric acids as the principal liquid products. To enhance butyric acid production, performance of the strain in batch fermentation was evaluated with various temperatures (20–47 °C), initial pH (5.0–10.0), and xylose concentration (6–20 g/L). The results showed that the optimal temperature, initial pH, and xylose concentration for butyric acid production were 37 °C, 9.0, and 8.00 g/L, respectively. Under the optimal condition, the yield and specific yield of butyric acid reached about 2.58 g/L and 0.36 g/g xylose, respectively, with 75.00% butyric acid in the total volatile fatty acids. As renewable energy, hydrogen was also collected from the xylose fermentation with a yield of about 73.86 mmol/L. The kinetics of growth and product formation indicated that the maximal cell growth rate (μ m ) and the specific butyric acid yield were 0.1466 h−1 and 3.6274 g/g cell (dry weight), respectively. The better performance in xylose fermentation showed C. butyricum B10 a potential application in efficient butyric acid production from lignocellulose.
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This work was supported financially by National Natural Science Foundation of China (Grant No. 51478141) and the State Key Laboratory of Urban Water Resource and Environment (Harbin Institute of Technology) (Grant No. 2016DX06).
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Wang, X., Li, J., Chi, X. et al. A novel isolate of Clostridium butyricum for efficient butyric acid production by xylose fermentation. Ann Microbiol 68, 321–330 (2018). https://doi.org/10.1007/s13213-018-1340-4
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DOI: https://doi.org/10.1007/s13213-018-1340-4