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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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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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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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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 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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Related Experiment Video

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Methanol Independent Expression by Pichia Pastoris Employing De-repression Technologies
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Dynamics in bioprocess development for Pichia pastoris.

Oliver Spadiut1, Christoph Herwig

  • 1a Vienna University of Technology; Institute of Chemical Engineering ; Research Area Biochemical Engineering ; Vienna , Austria.

Bioengineered
|December 9, 2014
PubMed
Summary

This study introduces specific substrate uptake rate for optimizing Pichia pastoris bioprocesses. Dynamic fed-batch strategies improve recombinant protein production and purity by considering cell physiology.

Keywords:
C-source, carbon-source.Pichia pastorisbioprocess developmentdynamicsfed-batchphysiological parameterqp, specific productivityqs, specific substrate uptake ratespecific substrate uptake rateμ, specific growth rate

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Area of Science:

  • Biotechnology
  • Biochemistry
  • Microbiology

Background:

  • Pichia pastoris is a key host for recombinant protein production, especially biopharmaceuticals, due to its posttranslational modification capabilities.
  • Traditional fed-batch processes often use constant growth rates, risking overfeeding and cellular damage by ignoring physiological changes.

Purpose of the Study:

  • To introduce and validate the specific substrate uptake rate as a novel physiological parameter for designing Pichia pastoris fed-batch strategies.
  • To demonstrate how dynamic fed-batch approaches can enhance productivity and product purity.

Main Methods:

  • Development of dynamic fed-batch experiments to determine strain-specific parameters.
  • Utilizing the specific substrate uptake rate to design optimized feeding profiles.

Main Results:

  • Strain-specific parameters for feeding profiles can be easily determined using dynamic batch experiments.
  • Dynamic feeding strategies significantly impact productivity and product purity in Pichia pastoris cultures.

Conclusions:

  • The specific substrate uptake rate is a valuable parameter for improving bioprocess development in Pichia pastoris.
  • Dynamic fed-batch strategies offer a more robust and efficient approach to recombinant protein production.