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Large-scale Top-down Proteomics Using Capillary Zone Electrophoresis Tandem Mass Spectrometry

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Published on: October 24, 2018

Improved capillary electrophoresis frontal analysis by dynamically coating the capillary with polyelectrolyte

Chao Liu¹, Jingwu Kang

¹Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Lingling Road 345, Shanghai 200032, China.

Journal of Chromatography. A

|April 5, 2012

Summary

This study introduces a new capillary coating method to improve capillary electrophoresis-frontal analysis (CE-FA) for drug analysis. The polyelectrolyte multilayer (PEML) coating significantly enhances measurement precision by reducing protein adsorption.

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Area of Science:

Analytical Chemistry
Separation Science
Biomolecular Analysis

Background:

Capillary electrophoresis (CE) methods are crucial for analyzing biomolecules and drugs.
Protein adsorption onto capillary walls can interfere with CE-FA measurements, affecting accuracy and repeatability.
Developing robust CE-FA techniques is essential for precise drug-protein binding studies.

Purpose of the Study:

To develop and evaluate an improved capillary coating for CE-FA.
To reduce protein adsorption and enhance measurement performance in CE-FA.
To assess the impact of the coating on the analysis of human serum albumin and drug binding.

Main Methods:

A polyelectrolyte multilayer (PEML) coating was created by sequentially introducing polybrene (positively charged) and dextran sulfate (negatively charged) into the capillary.
Human serum albumin (HSA) and six model drugs were used to test the coated capillary.
Capillary electrophoresis-frontal analysis (CE-FA) was employed to measure electroosmotic flow (EOF) mobility and drug plateau heights.

Main Results:

The PEML coating significantly reduced protein adsorption on the capillary wall.
Repeatability (RSD%) for EOF mobility improved from 3.7% to 0.51%.
Plateau height repeatability for free drugs improved from 0.61% to 0.34%.
The coating did not interfere with the measurement of protein-drug binding parameters.

Conclusions:

The developed PEML coating offers a simple and effective method to improve CE-FA performance.
This technique enhances the precision and reliability of quantitative analysis in CE.
The PEML coating is a valuable tool for studying drug-protein interactions without introducing measurement artifacts.