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Upstream Processing01:27

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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...
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Designing Growth Media for Bioreactors01:30

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Growth media provide essential nutrients that support cell growth and metabolism, thereby enhancing the yield of valuable products such as enzymes, antibiotics, and biomass. Designing an effective growth medium involves balancing all components to prevent nutrient limitations or toxic excesses, both of which can impair growth and reduce product yields.Composition of a Typical Growth MediumA typical growth medium contains carbon and nitrogen sources, salts, vitamins, trace elements, and...
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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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Bioreactor Design and Operational System01:29

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Bioreactors are engineered vessels designed to cultivate microorganisms under controlled conditions for industrial bioprocessing. They maintain sterility and allow precise regulation of pH, temperature, oxygen, and nutrient levels to optimize microbial growth and metabolite production. Bioreactors range from small laboratory units of 1 liter to industrial systems holding up to 500,000 liters, though only about 75% of their volume is actively used for fermentation. The remaining headspace...
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Scale-Up Processes01:14

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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...
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Bioreactor Controls-II01:18

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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...
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Generic Protocol for Optimization of Heterologous Protein Production Using Automated Microbioreactor Technology
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Guiding bioprocess design by microbial ecology.

Jan Volmer1, Andreas Schmid2, Bruno Bühler3

  • 1Laboratory of Chemical Biotechnology, Department of Biochemical and Chemical Engineering, TU Dortmund University, Emil-Figge-Straße 66, 44227 Dortmund, Germany.

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Industrial bioprocesses leverage microbial ecology for profitability and eco-efficiency. Understanding synthetic microbial ecosystems aids biocatalyst and process design, optimizing technical systems using natural microbial properties.

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Area of Science:

  • Industrial biotechnology
  • Microbial ecology
  • Synthetic biology

Background:

  • Industrial bioprocess development prioritizes profitability and eco-efficiency.
  • Microbial bioprocess environments are viewed as synthetic technical microbial ecosystems.
  • Natural microbial systems are driven by survival and reproduction (Darwinian evolution).

Purpose of the Study:

  • To analyze the differences and similarities between natural and technical microbial systems.
  • To discuss biocatalyst and process design strategies based on microbial ecology.
  • To review methods for exploiting natural microbial properties in technical systems.

Main Methods:

  • Comparative analysis of natural and technical microbial ecosystem objectives.
  • Review of engineering strategies for biocatalyst and process design.
  • Examination of synthetic biology approaches for microbial exploitation.

Main Results:

  • Technical microbial systems have distinct objectives (eco-efficiency, productivity, profitability) compared to natural systems.
  • Strategies exist to manage conflicting objectives between natural and technical systems.
  • Natural microbial properties can be engineered for enhanced industrial applications.

Conclusions:

  • Microbial ecology is crucial for effective bioprocess design.
  • Synthetic biology offers significant potential for optimizing industrial bioprocesses.
  • Integrating ecological principles into bioprocess engineering drives innovation.