Kinetic modeling of gamma-aminobutyric acid production by Lactobacillus brevis based on pH-dependent model and rolling correction

doi:10.1016/j.cjche.2022.05.021

中国化学工程学报 ›› 2022, Vol. 50 ›› Issue (10): 352-360.DOI: 10.1016/j.cjche.2022.05.021

• Biotechnology and Bioengineering • 上一篇下一篇

Kinetic modeling of gamma-aminobutyric acid production by Lactobacillus brevis based on pH-dependent model and rolling correction

Min Wu¹, Juanjuan Ding¹, Zhaofeng Zhang¹, Shengping You^1,4, Wei Qi^1,2,3,4, Rongxin Su^1,2,3,4, Zhimin He^1,2

1 Chemical Engineering Research Center, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300350, China;
2 State Key Laboratory of Chemical Engineering, Tianjin University, Tianjin 300350, China;
3 Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, China;
4 Tianjin Key Laboratory of Membrane Science and Desalination Technology, Tianjin University, Tianjin 300072, China

收稿日期:2022-03-17 修回日期:2022-05-09 出版日期:2022-10-28 发布日期:2023-01-04
通讯作者: Shengping You,E-mail:ysp@tju.edu.cn;Wei Qi,E-mail:qiwei@tju.edu.cn;Zhimin He,E-mail:enzyme@tju.edu.cn
基金资助:
This work was supported by the National Natural Science Foundation of China (21621004, 22078239), the Beijing-Tianjin-Hebei Basic Research Cooperation Project (B2021210008), Tianjin Synthetic Biotechnology Innovation Capacity Improvement Project (TSBICIP-KJGG-004), and the Tianjin Development Program for Innovation and Entrepreneurship (2018).

Kinetic modeling of gamma-aminobutyric acid production by Lactobacillus brevis based on pH-dependent model and rolling correction

Min Wu¹, Juanjuan Ding¹, Zhaofeng Zhang¹, Shengping You^1,4, Wei Qi^1,2,3,4, Rongxin Su^1,2,3,4, Zhimin He^1,2

1 Chemical Engineering Research Center, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300350, China;
2 State Key Laboratory of Chemical Engineering, Tianjin University, Tianjin 300350, China;
3 Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, China;
4 Tianjin Key Laboratory of Membrane Science and Desalination Technology, Tianjin University, Tianjin 300072, China

Received:2022-03-17 Revised:2022-05-09 Online:2022-10-28 Published:2023-01-04
Contact: Shengping You,E-mail:ysp@tju.edu.cn;Wei Qi,E-mail:qiwei@tju.edu.cn;Zhimin He,E-mail:enzyme@tju.edu.cn
Supported by:
This work was supported by the National Natural Science Foundation of China (21621004, 22078239), the Beijing-Tianjin-Hebei Basic Research Cooperation Project (B2021210008), Tianjin Synthetic Biotechnology Innovation Capacity Improvement Project (TSBICIP-KJGG-004), and the Tianjin Development Program for Innovation and Entrepreneurship (2018).

摘要/Abstract

摘要： Gamma-aminobutyric acid (GABA) is a natural non-protein functional amino acid, which has potential for fermentation industrial production by Lactobacillus brevis. This work investigated the batch fermentation process and developed a kinetic model based on substrate restrictive model established by experimental data from L₂₅(5⁶) orthogonal experiments. In this study, the OD₆₀₀ value of fermentation broth was fixed to constant after reaching its maximum because the microorganism death showed no effect on the enzyme activity of glutamate decarboxylase (GAD). As pH is one of the key parameters in fermentation process, a pH-dependent kinetic model based on radial basis function was developed to enhance the practicality of the model. Furthermore, as to decrease the deviations between the simulated curves and the experimental data, the rolling correction strategy with OD₆₀₀ values that was measured in real-time was introduced into this work to modify the model. Finally, the accuracy of the rolling corrected and pH-dependent model was validated by good fitness between the simulated curves and data of the initial batch fermentation (pH 5.2). As a result, this pH-dependent kinetic model revealed that the optimal pH for biomass growth is 5.6-5.7 and for GABA production is about 5, respectively. Therefore, the developed model is practical and convenient for the instruction of GABA fermentation production, and it has instructive significance for the industrial scale.

关键词: Kinetic modeling, Fermentation, Gamma-aminobutyric, Lactobacillus brevis, pH control, Rolling correction

Abstract: Gamma-aminobutyric acid (GABA) is a natural non-protein functional amino acid, which has potential for fermentation industrial production by Lactobacillus brevis. This work investigated the batch fermentation process and developed a kinetic model based on substrate restrictive model established by experimental data from L₂₅(5⁶) orthogonal experiments. In this study, the OD₆₀₀ value of fermentation broth was fixed to constant after reaching its maximum because the microorganism death showed no effect on the enzyme activity of glutamate decarboxylase (GAD). As pH is one of the key parameters in fermentation process, a pH-dependent kinetic model based on radial basis function was developed to enhance the practicality of the model. Furthermore, as to decrease the deviations between the simulated curves and the experimental data, the rolling correction strategy with OD₆₀₀ values that was measured in real-time was introduced into this work to modify the model. Finally, the accuracy of the rolling corrected and pH-dependent model was validated by good fitness between the simulated curves and data of the initial batch fermentation (pH 5.2). As a result, this pH-dependent kinetic model revealed that the optimal pH for biomass growth is 5.6-5.7 and for GABA production is about 5, respectively. Therefore, the developed model is practical and convenient for the instruction of GABA fermentation production, and it has instructive significance for the industrial scale.

Key words: Kinetic modeling, Fermentation, Gamma-aminobutyric, Lactobacillus brevis, pH control, Rolling correction

Min Wu, Juanjuan Ding, Zhaofeng Zhang, Shengping You, Wei Qi, Rongxin Su, Zhimin He. Kinetic modeling of gamma-aminobutyric acid production by Lactobacillus brevis based on pH-dependent model and rolling correction[J]. 中国化学工程学报, 2022, 50(10): 352-360.

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Kinetic modeling of gamma-aminobutyric acid production by Lactobacillus brevis based on pH-dependent model and rolling correction

Kinetic modeling of gamma-aminobutyric acid production by Lactobacillus brevis based on pH-dependent model and rolling correction

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