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Bioreactor Controls-III01:22

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Strain improvement is a foundational strategy in industrial microbiology aimed at maximizing microbial productivity, particularly because natural isolates typically yield commercially valuable products in very low concentrations. Although optimizing the culture medium and environmental conditions can improve yields, these adjustments are inherently limited by the organism’s genetic potential. As a result, the focus shifts toward genetic modifications to enhance biosynthetic capacity. The...
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Light-Controlled Fermentations for Microbial Chemical and Protein Production
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Published on: March 22, 2022

Advanced control of glutathione fermentation process.

K Sakato1, H Tanaka

  • 1Technical Research Laboratories, Hofu Plant, Kyowa Hakko Kogyo Co., Ltd., Hofu City, Yamaguchi 747, Japan.

Biotechnology and Bioengineering
|October 20, 1992
PubMed
Summary

This study optimized glutathione (GSH) production using baker's yeast by controlling sugar feeding. The new fed-batch process improved GSH yields by 40% compared to traditional methods.

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Area of Science:

  • Biotechnology
  • Industrial Microbiology
  • Biochemical Engineering

Background:

  • Glutathione (GSH) is a vital biomolecule with significant industrial applications.
  • Optimizing fermentation processes is crucial for efficient and cost-effective GSH production.
  • Baker's yeast (Saccharomyces cerevisiae) is a common host for producing GSH.

Purpose of the Study:

  • To investigate and optimize the fermentation process for glutathione (GSH) production.
  • To develop an improved fed-batch strategy for enhanced GSH yields using an optimized yeast strain.
  • To enable successful scale-up of GSH production to an industrial level.

Main Methods:

  • Utilized an improved strain of Saccharomyces cerevisiae KY6186 for glutathione fermentation.
  • Determined the optimal sugar feed profile for fed-batch operation based on sugar and ethanol utilization.
  • Developed and implemented a feedforward/feedback control system to regulate sugar feed rate.
  • Employed on-line monitoring of oxygen and ethanol concentrations in exhaust gas for process control.

Main Results:

  • Identified simultaneous utilization of sugar and ethanol as a key factor for industrial GSH production.
  • The developed feedforward/feedback control system successfully regulated sugar feed rate.
  • Achieved a significant 40% average improvement in glutathione production yields compared to conventional methods.
  • Successfully scaled up the optimized fermentation process to a production level.

Conclusions:

  • The developed fed-batch control strategy significantly enhances glutathione production efficiency.
  • Simultaneous sugar and ethanol utilization is a critical parameter for optimizing GSH fermentation.
  • The study demonstrates a viable and scalable method for industrial glutathione production.