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Related Experiment Videos

Solid state fermentation: acid protease production in controlled CO2 and O2 environments.

E Villegas1, S Aubague, L Alcantara

  • 1Universidad Autónoma Metropolitana - Iztapalapa, Departamento de Ingeniería de Procesos e Hidráulica, Apdo. Postal 55-5334 09340, México.

Biotechnology Advances
|January 1, 1993
PubMed
Summary

Optimizing Aspergillus niger fermentation for acid protease production requires specific gas conditions. A mixture of 4% carbon dioxide (CO2) and 21% oxygen (O2) significantly boosted protease yield by 43% compared to air.

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Area of Science:

  • Biotechnology
  • Enzyme Production
  • Industrial Microbiology

Background:

  • Solid-state fermentation (SSF) is a key process for producing enzymes like acid protease.
  • Aspergillus niger is a widely used microorganism for industrial enzyme synthesis.
  • Controlling the gaseous environment (O2 and CO2 partial pressures) can significantly impact microbial metabolism and product formation.

Purpose of the Study:

  • To investigate the impact of varying carbon dioxide (CO2) and oxygen (O2) partial pressures on acid protease production by Aspergillus niger during solid-state fermentation.
  • To establish correlations between fermentation parameters (pH, temperature, gas evolution) and acid protease yield.
  • To identify optimal gas compositions for maximizing acid protease biosynthesis.

Main Methods:

Related Experiment Videos

  • Solid-state fermentation of wheat bran using Aspergillus niger.
  • Utilization of a specialized fermentation system for real-time monitoring of pH, temperature, gas flow, pressure drop, and CO2 production.
  • Systematic evaluation of six paired combinations of CO2 and O2 concentrations.

Main Results:

  • A direct relationship was observed between pressure drop, CO2 production, and temperature increase.
  • pH evolution patterns showed variations depending on whether measurements were taken on-line or from a liquid homogenate.
  • Acid protease production was enhanced by 4% CO2, reaching a maximum 43% increase over air with a 4% CO2 and 21% O2 mixture.
  • Protease yield demonstrated a strong correlation with mold metabolic activity, indicated by total CO2 evolved.

Conclusions:

  • The partial pressures of O2 and CO2 are critical factors influencing acid protease production in Aspergillus niger SSF.
  • Optimal conditions for maximizing acid protease yield involve a specific gas mixture (4% CO2, 21% O2).
  • Monitoring CO2 evolution serves as a reliable indicator of mold metabolic activity and protease production potential.