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Related Experiment Videos

Partitioning invertase between a dilute water solution and generated droplets.

S Ko1, V Loha, L Du

  • 1Chemical Engineering Department, Vanderbilt University, Nashville, TN 37235, USA.

Applied Biochemistry and Biotechnology
|August 12, 2004
PubMed
Summary
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Controlling initial solution pH during protein droplet fractionation is key. Optimal pH 3.0 maximizes protein concentration in droplets while minimizing enzyme activity loss, crucial for bioreactor applications.

Area of Science:

  • Biochemical Engineering
  • Separation Science
  • Protein Chemistry

Background:

  • Natural phenomena like sea mist concentrate substances.
  • Air-fluidized bed bioreactors mimic this, transferring proteins to a droplet phase.
  • This process, known as droplet fractionation, enriches proteins but can reduce enzyme activity.

Purpose of the Study:

  • To investigate the effect of initial solution pH on enzyme activity loss during droplet fractionation.
  • To optimize pH for maximizing protein recovery and minimizing enzyme degradation.
  • To understand the relationship between pH, surface tension, and protein partitioning.

Main Methods:

  • Simulating droplet fractionation by shaking a protein solution (invertase) in a separatory funnel.
  • Measuring protein concentration and enzymatic activity in initial, residual, and droplet phases.

Related Experiment Videos

  • Varying initial solution pH and surface tension to assess their impact on the partition coefficient and activity loss.

    • Main Results:

    • The partition coefficient (droplet to residual concentration ratio) peaked at approximately 4.8 near pH 3.0.
    • Protein partitioning decreased as initial solution pH increased from 3.0 to 8.0.
    • Enzyme activity loss increased with rising bulk solution pH, with up to 90% activity lost in droplets at certain pH levels.

    Conclusions:

    • Initial solution pH is a critical variable for optimizing droplet fractionation of proteins like invertase.
    • pH 3.0 appears to be the optimal condition for maximizing protein concentration in droplets while mitigating activity loss.
    • Further research into surface tension effects and activity preservation is warranted for industrial applications.