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Detergent Purification of Membrane Proteins01:18

Detergent Purification of Membrane Proteins

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Detergents are used to purify the integral proteins of the membrane. The hydrophobic portion of the detergent can replace membrane phospholipids while solubilizing the membrane proteins. When detergent monomers reach a specific concentration in a solution called critical micelle concentration (CMC), they form micelles. Above CMC, the concentration of the detergent monomers remains in equilibrium with the micelle. The number of detergent monomers present in the CMC varies for each detergent, and...
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Related Experiment Video

Updated: Aug 8, 2025

Glycopeptide Capture for Cell Surface Proteomics
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Membrane-Based Hybrid Method for Purifying PEGylated Proteins.

Shing Fung Lam1, Xiaojiao Shang1, Raja Ghosh1

  • 1Department of Chemical Engineering, McMaster University, 1280 Main Street West, Hamilton, ON L8S 4L7, Canada.

Membranes
|February 25, 2023
PubMed
Summary

This study introduces a novel microfiltration membrane method for purifying PEGylated proteins. This fast and scalable technique efficiently separates modified proteins from impurities and even different PEGylated forms.

Keywords:
PEGylated proteinhybrid methodmembrane separationmicrofiltrationpurification

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Area of Science:

  • Biochemistry
  • Biotechnology
  • Separation Science

Background:

  • Chromatographic methods for purifying PEGylated proteins are slow and difficult to scale.
  • Existing methods face limitations in speed and scalability for protein purification.

Purpose of the Study:

  • To develop a novel, fast, and scalable membrane-based hybrid method for purifying PEGylated proteins.
  • To demonstrate the ability to fractionate different PEGylated protein forms using this new method.

Main Methods:

  • Utilizing polyethylene glycol's (PEG) phase transition in a lyotropic salt solution to form micelle-like structures.
  • Employing microfiltration membranes to retain PEGylated protein micelles while allowing soluble impurities to pass.
  • Investigating both stirred cell and tangential flow filtration devices for hybrid separation.

Main Results:

  • Successful purification of PEGylated proteins using a microfiltration membrane-based hybrid approach.
  • Demonstrated removal of soluble impurities, including unmodified proteins.
  • Achieved fractionation of mono-PEGylated and di-PEGylated protein forms by controlling salt removal.

Conclusions:

  • The described membrane-based hybrid method offers a rapid and scalable alternative for PEGylated protein purification.
  • This technique effectively separates PEGylated proteins from impurities and allows for the fractionation of different PEGylation degrees.
  • The method holds promise for improving the efficiency of biopharmaceutical purification processes.