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Related Experiment Videos

Evaluation of parallel operated small-scale bubble columns for microbial process development using Staphylococcus

S Dilsen1, W Paul, D Herforth

  • 1Institut für Biotechnologie, Forschungszentrum Jülich GmbH, 52425, Julich, Germany.

Journal of Biotechnology
|May 30, 2001
PubMed
Summary
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Comparing bioreactor types for producing human calcitonin precursor fusion protein with Staphylococcus carnosus, pH-controlled bubble columns offer superior oxygen transfer, achieving higher cell densities than shake flasks.

Area of Science:

  • Biotechnology
  • Microbial Fermentation
  • Protein Production

Background:

  • Staphylococcus carnosus is a suitable host for recombinant protein production.
  • Process development for microbial fermentation requires appropriate bioreactor selection.
  • Optimizing fermentation conditions is crucial for maximizing product yield.

Purpose of the Study:

  • To compare the efficacy of shake flasks and pH-controlled small-scale bubble columns for process development.
  • To optimize medium composition for enhanced production of human calcitonin precursor fusion protein.
  • To evaluate the scalability of bubble column performance against stirred-tank reactors.

Main Methods:

  • Fermentation experiments were conducted in shake flasks and pH-controlled small-scale bubble columns.

Related Experiment Videos

  • Medium composition was optimized using glycerol as an energy source and yeast extract as a carbon and nitrogen source.
  • Cell dry weight and protein production were monitored under various conditions.
  • Performance was compared to established stirred-tank reactor systems.

    • Main Results:

    • Optimized medium in shake flasks increased cell dry weight by a factor of 10 (to 5 g/L).
    • pH-controlled bubble columns achieved higher cell dry weight concentrations (up to 12.5 g/L) due to enhanced oxygen transfer.
    • Recombinant Staphylococcus carnosus performance in bubble columns was comparable to stirred-tank reactors for fusion protein production.

    Conclusions:

    • pH-controlled bubble columns are effective tools for process development and scale-up studies in recombinant protein production.
    • Optimized media and controlled fermentation parameters significantly enhance microbial cell density and protein yield.
    • Bubble columns offer a viable alternative to stirred-tank reactors for certain recombinant protein production processes.