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Optimizing the rotor design for controlled-shear affinity filtration using computational fluid dynamics.

Patrick Francis1, D Mark Martinez, Fariborz Taghipour

  • 1Michael Smith Laboratories, Vancouver BC V6T 1Z3, Canada.

Biotechnology and Bioengineering
|August 29, 2006
PubMed
Summary
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Optimizing the controlled shear affinity filtration (CSAF) rotor design using computational fluid dynamics (CFD) significantly enhances protein purification. The improved CSAF rotor design reduces operational speed by 60% and increases throughput sixfold.

Area of Science:

  • Biotechnology
  • Chemical Engineering
  • Bioprocess Engineering

Background:

  • Controlled Shear Affinity Filtration (CSAF) is a novel technology for protein capture and purification directly from cell culture.
  • The original CSAF device rotor design exhibited non-uniform shear stress, necessitating high speeds and limiting scalability.
  • Membrane fouling and cell cake formation are key challenges in continuous bioprocessing.

Purpose of the Study:

  • To computationally model and optimize the CSAF rotor geometry for uniform shear stress distribution.
  • To improve the scalability and volumetric throughput of the CSAF technology.
  • To reduce operational requirements for effective protein purification.

Main Methods:

  • Computational Fluid Dynamics (CFD) simulations were employed to analyze rotor hydrodynamics.

Related Experiment Videos

  • CFD models were validated against Particle Image Velocimetry (PIV) experiments and low Reynolds number solutions.
  • A root-finding method was integrated with CFD to optimize the rotor's conical shape.

    • Main Results:

    • The original CSAF rotor design produced non-uniform shear stress, requiring high rotational speeds.
    • The optimized CSAF rotor geometry achieved a consistent shear stress of 0.17 Pa at 60% lower rotational velocity (250 rpm).
    • The optimized design allows for a 2.5x larger rotor diameter, increasing volumetric throughput more than sixfold.

    Conclusions:

    • The optimized CSAF rotor design significantly improves shear stress uniformity, addressing limitations of the original device.
    • This optimization enhances the scalability and efficiency of CSAF for protein purification from cell cultures.
    • The study demonstrates the successful application of CFD for bioprocess equipment design and optimization.