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Applied Biochemistry and Biotechnology

, Volume 162, Issue 8, pp 2149–2156 | Cite as

Application of a pH Feedback-Controlled Substrate Feeding Method in Lactic Acid Production

  • Yong Zhang
  • Wei Cong
  • ShaoYuan Shi
Article

Abstract

Substrate concentration in lactic acid fermentation broth could not be controlled well by traditional feeding methods, including constant, intermittent, and exponential feeding methods, in fed-batch experiments. A simple feedback feeding method based on pH was proposed to control pH and substrate concentration synchronously to enhance lactic acid production in fed-batch culture. As the linear relationship between the consumption amounts of alkali and that of substrate was concluded during lactic acid fermentation, the alkali and substrate in the feeding broth were mixed together proportionally. Thus, the concentration of substrate could be controlled through the adjustment of pH automatically. In the fed-batch lactic acid fermentation with Lactobacillus lactis-11 by this method, the residual glucose concentration in fermentation broth was controlled between 4.1 and 4.9 g L−1, and the highest concentration of lactic acid, maximum cell dry weight, volumetric productivity of lactic acid, and yield were 96.3 g L−1, 4.7 g L−1, 1.9 g L−1 h−1, and 0.99 g lactic acid per gram of glucose, respectively, compared to 82.7 g L−1, 3.31 g L−1, 1.7 g L−1 h−1, and 0.92 g lactic acid per gram of glucose in batch culture. This feeding method was simple and easily operated and could be feasible for industrial lactic acid production in the future.

Keywords

Lactic acid Fed-batch Lactobacillus lactis-11 Ammonium hydroxide pH feedback 

Notes

Acknowledgments

This research was supported by the National High-Tech Research and Development Program (863 Program, P.R. China, 2007AA10Z360).

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Copyright information

© Springer Science+Business Media, LLC 2010

Authors and Affiliations

  1. 1.National Key Laboratory of Biochemical Engineering, Institute of Process EngineeringChinese Academy of SciencesBeijingPeople’s Republic of China
  2. 2.Graduate University of the Chinese Academy of SciencesBeijingPeople’s Republic of China

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