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Related Concept Videos

Upstream Processing01:27

Upstream Processing

Upstream processing represents a critical phase in biomanufacturing, wherein biological systems such as microorganisms, mammalian cells, or insect cells are cultivated to produce therapeutic proteins, vaccines, enzymes, or other biologically derived products. This phase encompasses all steps from the selection and genetic manipulation of the production organism to the cultivation of cells in bioreactors under tightly controlled environmental conditions.Host Selection and Genetic OptimizationThe...
Scale-Up Processes01:14

Scale-Up Processes

The scale-up of microbial fermentation processes is essential in industrial biotechnology, allowing the transition from laboratory-scale experiments to commercial-scale production while aiming to maintain product yield and quality. This process requires meticulous adjustment of equipment design, process parameters, and contamination control strategies to accommodate increasing culture volumes.At the laboratory scale, cultures are typically maintained in 1 to 10-liter glass or autoclavable...
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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Methods of Medium Optimization

Optimizing growth media enhances microbial proliferation and maximizes product yield. Statistical experimental design methodologies provide structured and reproducible approaches, offering progressively higher levels of robustness and efficiency.The One-Factor-at-a-Time (OFAT) MethodThe One-Factor-at-a-Time (OFAT) method involves adjusting a single variable while keeping all others constant. However, it cannot detect interactions between variables, often leading to suboptimal outcomes when...
Bioreactor Controls-II01:18

Bioreactor Controls-II

In aerobic fermentations, oxygen is vital for microbial growth and metabolite production. Since air comprises only about 20% oxygen and the gas is poorly soluble in water—just 9 ppm at 20°C—supplying sufficient oxygen becomes a critical challenge, especially in high-demand processes like yeast growth or citric acid production. Even a fully saturated broth may offer only a few seconds of oxygen availability.To address this, sterile or scrubbed air is introduced into the fermentor via a sparger...
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Batch vs Continuous Culture

Fermentation is a foundational biotechnological process used to produce pharmaceuticals, biofuels, enzymes, and food additives. Among industrial strategies, batch and continuous fermentation are the two most widely applied. Although both rely on microbial conversion of substrates into desired products, they differ markedly in operation, productivity, and suitability for specific applications.Batch fermentation occurs in a closed system in which nutrient media and inoculum are added at the...

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Related Experiment Video

Updated: Jul 3, 2026

Generic Protocol for Optimization of Heterologous Protein Production Using Automated Microbioreactor Technology
06:24

Generic Protocol for Optimization of Heterologous Protein Production Using Automated Microbioreactor Technology

Published on: December 15, 2017

Optimization of a two-stage recombinant fermentation process: the dilution rate effect.

A Hortacsu1, D D Ryu

  • 1Chemical Engineering Department, University of California, Davis, California 86616-5294, USA.

Biotechnology and Bioengineering
|October 20, 1991
PubMed
Summary

Optimizing dilution rates in recombinant Escherichia coli fermentation enhances product formation. Dynamic control of specific growth rate increased overall productivity by 3.5% in a two-stage system.

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Area of Science:

  • Biotechnology
  • Microbial Fermentation
  • Genetic Engineering

Background:

  • Recombinant Escherichia coli cultures are widely used for biopharmaceutical production.
  • Fermentation performance, including product yield, is influenced by operational parameters like dilution rate.
  • Dilution rate impacts key genetic factors governing product formation in recombinant systems.

Purpose of the Study:

  • To investigate the effect of dilution rates on the performance of a two-stage fermentation system for recombinant Escherichia coli.
  • To develop kinetic models for plasmid stability, content, and gene expression.
  • To determine optimal specific growth rates for maximizing overall productivity.

Main Methods:

  • Studied the effects of dilution rates on recombinant Escherichia coli performance in a two-stage fermentation.
  • Developed kinetic models and correlations for plasmid stability, plasmid content, and specific gene expression rate.
  • Employed direct search and dynamic optimization (maximum principle) to find optimal apparent specific growth rates.

Main Results:

  • Higher dilution rates improved plasmid stability in the first stage but reduced plasmid content.
  • The optimal constant apparent specific growth rate for maximum overall productivity was determined to be 0.40 h(-1).
  • A linear time-dependent apparent specific growth rate control (µ₂(t) = 0.0007t) yielded a 3.5% increase in overall productivity.

Conclusions:

  • Dilution rate is a critical parameter influencing genetic stability and product formation in recombinant E. coli.
  • Optimal constant specific growth rate maximizes overall productivity and coincides with maximum plasmid content.
  • Dynamic control of apparent specific growth rate offers a strategy for further enhancing fermentation productivity.