Abstract
γ-Aminobutyric acid (GABA) is a crucial neurotransmitter with wide application prospects. In this study, we focused on a GABA-producing strain from a traditional Chinese fermented beverage system. Among the six isolates, Lactobacillus hilgardii GZ2 exhibited the greatest ability to produce GABA in the traditional Chinese fermented beverage system. To increase GABA production, we optimized carbon sources, nitrogen sources, temperature, pH, and monosodium glutamate and glucose concentrations and conducted fed-batch fermentation. The best carbon and nitrogen sources for GABA production and cell growth were glucose, yeast extract and tryptone. Gradual increases in GABA were observed as the glucose and monosodium glutamate concentrations increased from 10 g/L to 50 g/L. During fed-batch fermentation, lactic acid was used to maintain the pH at 5.56, and after feeding with 0.03 g/mL glucose and 0.4 g/mL sodium glutamate for 72 h, the GABA yield reached 239 g/L. This novel high-GABA-producing strain holds great potential for the industrial production of GABA, as well as the development of health-promoting functional foods and medical fields.
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Acknowledgements
We thank Prof. Xu Yan and Dr. Ren Cong (Jiangnan University, China) for providing relevant experimental materials.
Funding
This study was partially supported by the National Natural Science Foundation of China (32101905), the Jiangsu Agricultural Science and Technology Innovation Fund (CX(20)2029) and the Open Project Program of the Key Laboratory of Brewing Molecular Engineering of China Light Industry (BME-202203).
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Validation, formal analysis, data curation, writing-original draft preparation, Xiao-Zhou Zou; conceptualization, methodology, validation, formal analysis, data curation, writing-original draft preparation, writing-review and editing, supervision, project administration, Lu-Chan Gong; validation, methodology, formal analysis, Ting-Ting Li; validation, formal analysis, Shu-Yi Lv; conceptualization, methodology, writing-review and editing, writing-original draft preparation, supervision, administration, Jun Wang. All authors have read and agreed to the published version of the manuscript.
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Zou, XZ., Gong, LC., Li, TT. et al. Optimization of fermentation conditions for the production of γ-aminobutyric acid by Lactobacillus hilgardii GZ2 from traditional Chinese fermented beverage system. Bioprocess Biosyst Eng 47, 957–969 (2024). https://doi.org/10.1007/s00449-024-03028-x
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DOI: https://doi.org/10.1007/s00449-024-03028-x