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Related Experiment Videos

High-yield Bacillus subtilis protease production by solid-state fermentation.

Valeria F Soares1, Leda R Castilho, Elba P S Bon

  • 1Department of Biochemistry, Institute of Chemistry, Federal University of Rio de Janeiro, Brazil.

Applied Biochemistry and Biotechnology
|May 27, 2005
PubMed
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Bacillus subtilis can produce extracellular protease using soy cake in solid-state fermentation (SSF). This method yielded significantly higher enzyme activity and productivity compared to submerged fermentation (SF), indicating strong biotechnological potential.

Area of Science:

  • Biotechnology and Industrial Microbiology
  • Enzyme Production
  • Fermentation Technology

Background:

  • Extracellular protease production by Bacillus subtilis is a key industrial process.
  • Solid-state fermentation (SSF) offers potential advantages over submerged fermentation (SF) for microbial product generation.
  • Optimization of fermentation parameters is crucial for maximizing enzyme yield.

Purpose of the Study:

  • To investigate the potential of Bacillus subtilis for extracellular protease production in solid-state fermentation (SSF) using soy cake.
  • To compare protease production in SSF versus submerged fermentation (SF).
  • To optimize SSF conditions, including inoculum concentration, physiological age, temperature, and pH.

Main Methods:

  • Solid-state fermentation (SSF) using Bacillus subtilis with soy cake as the culture medium.

Related Experiment Videos

  • Optimization of inoculum concentration (0.7-2.0 mg g(-1)) and physiological age (exponential growth phase).
  • Comparative study of cultivation temperature and initial medium pH in SSF and SF.
  • Kinetic analysis of enzyme production and inactivation.

    • Main Results:

    • Maximum protease activity (960 U g(-1)) and productivity (15.4 U g(-1) h(-1)) were achieved in SSF.
    • SSF demonstrated a broader optimal pH range (5-10) compared to SF, with the same optimal temperature (37°C).
    • Enzyme production in SSF was 10-fold higher in activity and 45% higher in productivity (per volume of enzyme extract) than in SF.
    • Enzyme inactivation began before biomass reached maximum levels in both SSF and SF.

    Conclusions:

    • Bacillus subtilis exhibits significant biotechnological potential for high-yield extracellular protease production via solid-state fermentation.
    • SSF using soy cake is a superior method for producing Bacillus subtilis protease compared to submerged fermentation.
    • Optimized SSF conditions enhance enzyme yield and productivity, making it an attractive industrial process.