Journal of Microbiology and Biotechnology

The Korean Society for Microbiology and Biotechnology (한국미생물·생명공학회)
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Enhancement of L-Threonine Production by Controlling Sequential Carbon-Nitrogen Ratios during Fermentation

  • Lee, Hyeok-Won (Biotechnology Process Engineering Center, Korea Research Institute of Bioscience & Biotechnology(KRIBB)) ;
  • Lee, Hee-Suk (Biotechnology Process Engineering Center, Korea Research Institute of Bioscience & Biotechnology(KRIBB)) ;
  • Kim, Chun-Suk (Biotechnology Process Engineering Center, Korea Research Institute of Bioscience & Biotechnology(KRIBB)) ;
  • Lee, Jin-Gyeom (Biotechnology Process Engineering Center, Korea Research Institute of Bioscience & Biotechnology(KRIBB)) ;
  • Kim, Won-Kyo (Biotechnology Process Engineering Center, Korea Research Institute of Bioscience & Biotechnology(KRIBB)) ;
  • Lee, Eun-Gyo (Biotechnology Process Engineering Center, Korea Research Institute of Bioscience & Biotechnology(KRIBB)) ;
  • Lee, Hong-Weon (Biotechnology Process Engineering Center, Korea Research Institute of Bioscience & Biotechnology(KRIBB))
  • Received : 2017.09.12
  • Accepted : 2017.11.12
  • Published : 2018.02.28
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Abstract

Controlling the residual glucose concentration is important for improving productivity in $\text\tiny{L}$-threonine fermentation. In this study, we developed a procedure to automatically control the feeding quantity of glucose solution as a function of ammonia-water consumption rate. The feeding ratio ($R_{C/N}$) of glucose and ammonia water was predetermined via a stoichiometric approach, on the basis of glucose-ammonia water consumption rates. In a 5-L fermenter, 102 g/l $\text\tiny{L}$-threonine was obtained using our glucose-ammonia water combined feeding strategy, which was then successfully applied in a 500-L fermenter (89 g/l). Therefore, we conclude that an automatic combination feeding strategy is suitable for improving $\text\tiny{L}$-threonine production.

Keywords

References

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