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Related Experiment Video

Updated: Jun 12, 2026

Purification and Visualization of Lipopolysaccharide from Gram-negative Bacteria by Hot Aqueous-phenol Extraction
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Purification and Visualization of Lipopolysaccharide from Gram-negative Bacteria by Hot Aqueous-phenol Extraction

Published on: May 28, 2012

LPS removal from an E. coli fermentation broth using aqueous two-phase micellar system.

André M Lopes1, Pérola O Magalhães, Priscila G Mazzola

  • 1Dept. of Biochemical and Pharmaceutical Technology, School of Pharmaceutical Sciences, University of São Paulo, FCF/USP, São Paulo/SP, Brasil. andreml@usp.br

Biotechnology Progress
|June 24, 2010
PubMed
Summary

This study shows that aqueous two-phase micellar systems (ATPMS) effectively remove endotoxin (LPS) from recombinant proteins like GFPuv. This purification method enhances the production of injectable therapeutics by achieving high endotoxin removal rates.

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Area of Science:

  • Biotechnology
  • Biochemistry
  • Separation Science

Background:

  • Endotoxin (lipopolysaccharide, LPS) removal is crucial for injectable therapeutics manufactured using bacterial systems.
  • Efficient purification techniques are vital for large-scale recombinant biomolecule production.

Purpose of the Study:

  • To evaluate aqueous two-phase micellar systems (ATPMS) for endotoxin removal from recombinant proteins.
  • To assess the recovery of green fluorescent protein (GFPuv) during this process.

Main Methods:

  • Partition assays were performed using pure lipopolysaccharide (LPS) and E. coli cell lysate.
  • The partitioning behavior of GFPuv and LPS in the ATPMS was analyzed.

Main Results:

  • ATPMS demonstrated effective recovery of GFPuv, with partitioning favoring the micelle-poor phase (K(GFPuv) < 1.00).
  • High levels of LPS removal were achieved, with over 98.00% endotoxin removal into the micelle-rich phase (%REM(LPS) > 98.00%).

Conclusions:

  • ATPMS is a viable technology for endotoxin removal in biotechnology.
  • This system can serve as an initial purification step for removing high concentrations of LPS from recombinant protein preparations.