An efficient process for co-production of γ-aminobutyric acid and probiotic Bacillus subtilis cells

Abstract

This study was to establish an integrated process for the co-production of γ-aminobutyric acid (GABA) and live probiotics. Six probiotic bacteria were screened and Bacillus subtilis ATCC 6051 showed the highest GABA-producing capacity. The optimal temperature and initial pH value for GABA production in B. subtilis were found to be 30 °C and 8.0, respectively. A variety of carbon and nitrogen sources were tested, and potato starch and peptone were the preferred carbon and nitrogen sources for GABA production, respectively. The concentrations of carbon source, nitrogen source and substrate (sodium l-glutamate) were then optimized using the response surface methodology. The GABA titer and concentration of viable cells of B. subtilis reached 19.74 g/L and 6.0 × 108 cfu/mL at 120 h. The GABA titer represents the highest production of GABA in B. subtilis. This work thus demonstrates a highly efficient co-production process for GABA and probiotic B. subtilis cells.

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Acknowledgements

This work was financially supported by a Grant-In-Aid (16GRNT26430067) from the American Heart Association (USA), the Agricultural and Social Development Program of Hangzhou Science and Technology Bureau of Zhejiang Province (China), the Young College Teachers Studying Abroad fund (Grant No. 3-2016) of Hubei Province (China), Jianghan University Doctoral Research Startup Fund Project (Grant No. 1017-06330003), and Major Technical Innovation Project of Hubei Province (China) (Grant No. 2017ABA147).

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Correspondence to Jixun Zhan.

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Wang, H., Huang, J., Sun, L. et al. An efficient process for co-production of γ-aminobutyric acid and probiotic Bacillus subtilis cells. Food Sci Biotechnol 28, 155–163 (2019). https://doi.org/10.1007/s10068-018-0461-7

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Keywords

  • γ-Aminobutyric acid
  • Bacillus subtilis ATCC 605
  • Viable cells
  • Optimization
  • Response surface methodology