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Sequential fed-batch fermentation of 1,3-propanediol from glycerol by Clostridium butyricum DL07
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  • Xiao-Li Wang,
  • Jin-Jie Zhou,
  • Jun-Tao Shen,
  • Ya-Feng Zheng,
  • yaqin sun,
  • Zhi-Long Xiu
Xiao-Li Wang
Dalian University of Technology
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Jin-Jie Zhou
Dalian University of Technology
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Jun-Tao Shen
Dalian University of Technology
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Ya-Feng Zheng
Dalian University of Technology
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yaqin sun
Dalian University of Technology
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Zhi-Long Xiu
Dalian University of Technology
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Abstract

The demand for 1,3-propanediol (1,3-PDO) has increased sharply due to its role as a monomer for the synthesis of polytrimethylene terephthalate (PTT). Although Clostridium butyricum is considered to be one of the most promising bio-producers for 1,3-PDO, its low productivity hinders its application on industrial scale because of the longer time needed for anaerobic cultivation. In this study, an excellent mutant of C. butyricum (DL07) was obtained with high-level titer and productivity of 1,3-PDO, i.e. 104.78 g/L and 3.38 g/(L•h) vs. 94.23 g/L and 3.04 g/(L•h) using pure or crude glycerol as substrate in fed-batch fermentation, respectively. Furthermore, a novel sequential fed-batch fermentation was investigated, in which the next bioreactor was inoculated by C. butyricum DL07 cells growing at exponential phase in the prior bioreactor. It could run steadily for at least eight cycles. The average concentration of 1,3-PDO in eight cycles was 84.62 g/L with the average productivity of 3.05 g/(L•h). The sequential fed-batch fermentation could achieve semi-continuous production of 1,3-PDO with higher productivity than repeated fed-batch fermentation, and would greatly contribute to the industrial production of 1,3-propanediol by C. butyricum. Key words: 1,3-Propanediol; glycerol; Clostridium butyricum; sequential fed-batch fermentation

Peer review status:Published

30 Sep 2020Published in Applied Microbiology and Biotechnology. 10.1007/s00253-020-10931-2