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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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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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Microbioreactor-Based Production of Anchorage-Dependent Mesenchymal Stromal Cells Primed for Acute Respiratory Distress Syndrome
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Membrane bioreactors enhance microenvironmental conditioning and tissue development.

Michael R Doran1, Brandon D Markway, Angelique Clark

  • 1Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, Brisbane, Australia . m.doran@uq.edu.au

Tissue Engineering. Part C, Methods
|July 23, 2009
PubMed
Summary
This summary is machine-generated.

This study introduces a novel membrane-based microbioreactor for enhanced cell culture. This system allows for higher cell densities and better retention of cells and secretions, improving stem cell expansion and matrix accumulation.

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Area of Science:

  • Biotechnology
  • Cell Biology
  • Tissue Engineering

Background:

  • Traditional cell cultures have limitations in maintaining high cell densities.
  • Membrane bioreactors offer a solution by isolating cells from bulk medium.
  • This enables nutrient supply similar to biological circulatory systems.

Purpose of the Study:

  • To describe a novel, easy-to-operate membrane-based microbioreactor.
  • To demonstrate the benefits of retaining cells and secretions in a small culture volume.
  • To validate the system using hematopoietic and mesenchymal stem cell models.

Main Methods:

  • Utilized a semipermeable membrane with a 10 kDa molecular weight cutoff.
  • Isolated a 10 microL culture volume from 1 mL of bulk medium.
  • Employed pipette-based loading and harvesting for simplicity.

Main Results:

  • Successfully retained both cells and their secreted products within the microbioreactor.
  • Demonstrated enhanced hematopoietic stem cell expansion.
  • Showcased improved mesenchymal stem cell-derived cartilage matrix accumulation.

Conclusions:

  • The membrane-based microbioreactor facilitates high-density cell cultures.
  • This technology enhances cell expansion and extracellular matrix production.
  • The system offers a simple and effective tool for various cell culture applications.