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Generic Protocol for Optimization of Heterologous Protein Production Using Automated Microbioreactor Technology
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Fermentation process optimization of a bacteriostatic Bacillus coagulans based on response surface methodology.

Yonghong Li1,2, Xiuxiu Wu1, Min Li1

  • 1School of Pharmaceutical Sciences, Zhengzhou University, Zhengzhou, 450001, Henan, China.

AMB Express
|October 9, 2025
PubMed
Summary

This study optimized Bacillus coagulans production, enhancing its antimicrobial properties against common pathogens. Optimized conditions significantly increased live bacteria and spore yields, reducing production costs.

Keywords:
Bacillus coagulansBacteriostatic activityFermentation process optimizationResponse surface analysis

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Area of Science:

  • Microbiology
  • Industrial Biotechnology

Background:

  • Bacillus coagulans is a robust lactic acid bacterium with diverse applications.
  • Its potential as a probiotic and antimicrobial agent necessitates efficient production methods.

Purpose of the Study:

  • To screen and optimize Bacillus coagulans for enhanced antimicrobial activity.
  • To determine optimal medium composition and culture conditions for large-scale production.

Main Methods:

  • Screening of Bacillus coagulans strains for superior inhibition of Staphylococcus aureus, Escherichia coli, Vibrio parahaemolyticus, and Aeromonas hydrophila.
  • Optimization of medium components and culture parameters using statistical experimental designs (Plackett Burman, Response Surface Methodology).
  • Scale-up and feed strategy optimization in a 10 L fermenter.

Main Results:

  • A superior Bacillus coagulans strain was identified with significant antimicrobial activity.
  • Optimal medium composition and culture conditions (temperature, pH, inoculation, loading, speed, time) were established.
  • Production scale-up achieved high concentrations of live bacteria (4.63 × 10^9 CFU/mL) and spores (4.03 × 10^9 CFU/mL).

Conclusions:

  • Optimized production significantly increased Bacillus coagulans yields.
  • The study provides a cost-effective method for producing enhanced Bacillus coagulans.
  • This research supports the industrial application of Bacillus coagulans as a potent antimicrobial agent.