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Electrophoretic Separation of Proteins
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Semi-permanent cationic coating for protein separations.

C L Crihfield1, C J Kristoff1, L M Veltri1

  • 1C. Eugene Bennett Department of Chemistry, West Virginia University, Morgantown, WV, 26506, United States.

Journal of Chromatography. A
|August 6, 2019
PubMed
Summary
This summary is machine-generated.

A novel hybrid phospholipid-cetyltrimethylammonium bromide (CTAB) coating for capillary electrophoresis effectively separates both anionic and cationic proteins simultaneously. This method overcomes limitations of previous coatings, improving protein separation efficiency and stability.

Keywords:
Capillary electrophoresisElectroomostic flowProtein adsorptionSemi-permanent coatingSurface modificationpH-stability

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Area of Science:

  • Analytical Chemistry
  • Separation Science
  • Biochemistry

Background:

  • Capillary electrophoresis (CE) is widely used for protein separation.
  • Protein adsorption to negatively charged fused silica capillaries causes band broadening and reduces separation efficiency.
  • Existing capillary coatings to mitigate adsorption often compromise electroosmotic flow (EOF) and simultaneous separation of oppositely charged proteins.

Purpose of the Study:

  • To develop a robust capillary coating for high-efficiency simultaneous separation of anionic and cationic proteins in CE.
  • To address limitations of protein adsorption and compromised EOF associated with traditional fused silica capillaries and single-layer coatings.
  • To demonstrate the stability and broad applicability of the novel coating across various pH conditions and protein types.

Main Methods:

  • A two-layer capillary coating was developed using a phospholipid substrate and cetyltrimethylammonium bromide (CTAB).
  • The hybrid coating's performance was evaluated by comparing protein separations with a bare fused silica capillary.
  • Stability and reproducibility of the coating were assessed through prolonged flushing and multiple injection cycles.

Main Results:

  • The phospholipid-CTAB hybrid coating effectively suppressed protein adsorption, significantly improving separation efficiency compared to bare capillaries.
  • This hybrid coating enabled simultaneous high-efficiency separation of both cationic and anionic proteins.
  • A stable EOF (3.14 × 10⁻⁴ cm²V⁻¹s⁻¹) was achieved across a pH range of 4-8, with low relative standard deviation (1% RSD) and demonstrated robustness over time and multiple runs.

Conclusions:

  • The hybrid phospholipid-CTAB surface coating provides a stable and effective solution for simultaneous separation of diverse proteins in capillary electrophoresis.
  • This method overcomes key challenges in CE protein separations, offering improved efficiency and reliability.
  • The coating's stability and performance across a range of conditions make it a valuable tool for analyzing proteins, including isoforms and those with similar isoelectric points.