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Capillary Electrophoresis: Applications

Capillary Electrophoresis: Applications

Capillary electrophoretic separations offer various modes, each with unique applications. These modes include capillary zone electrophoresis, capillary gel electrophoresis, capillary array electrophoresis, capillary isoelectric focusing, capillary isotachophoresis, micellar electrokinetic chromatography, and capillary electrochromatography.
Capillary zone electrophoresis (CZE) separates ionic components based on their electrophoretic mobility. It has been used to separate proteins, amino acids,...

Electrophoresis: Overview

Electrophoresis: Overview

Electrophoresis is a powerful analytical separation technique that relies on the differential migration of charged species when subjected to an electric field. The core strength of electrophoresis lies in its ability to separate high-molecular-weight species in complex mixtures. It has found widespread use in biochemistry, molecular biology, and analytical chemistry, allowing the separation of compounds like amino acids, nucleotides, carbohydrates, and proteins with excellent resolution.
There...

Capillary Electrophoresis: Instrumentation

Capillary Electrophoresis: Instrumentation

Capillary electrophoresis instrumentation typically consists of several key components. A high-voltage power supply generates the electric field necessary for the separation by connecting to an anode (the positively charged electrode) and a cathode (the negatively charged electrode) located in buffer reservoirs at each end of the capillary tube. The system includes a sample vial, a fused silica capillary tube coated with polyimide for mechanical strength through which the sample components...

Ion-Exchange Chromatography

Ion-Exchange Chromatography

Ion-exchange chromatography, or IEC, is a technique for separating ions based on their affinity for the stationary phase. The stationary phase is a cross-linked polymer resin with covalently attached ionic functional groups. The functional groups can be either positively charged (cation exchangers) or negatively charged (anion exchangers). A cation exchanger consists of a polymeric anion and active cations, while an anion exchanger is a polymeric cation with active anions. The choice of...

Two-dimensional Gel Electrophoresis

Two-dimensional Gel Electrophoresis

Two-dimensional gel electrophoresis is a high-resolution protein separation method first introduced by O' Farrell and Klose in 1975. This method involves protein separation by two dimensions, mass and charge, making it more accurate than one-dimensional gel electrophoresis.
The first dimension separation uses the isoelectric focusing or IEF technique performed on immobilized pH gradient (IPG) strips that separate proteins according to their isoelectric points.
Biological samples, such as cells...

High-Performance Liquid Chromatography: Elution Process

High-Performance Liquid Chromatography: Elution Process

In High-Performance Liquid Chromatography (HPLC), the elution process is critical to the separation of analytes and the quality of chromatographic results. Elution describes how compounds move through the column and separate based on their interactions with the mobile and stationary phases. This process determines the resolution, peak shape, and retention times in the chromatogram, which are essential for identifying and quantifying components in complex mixtures. Understanding the elution...

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Related Experiment Video

Updated: Jun 1, 2026

Amplification of Escherichia coli in a Continuous-Flow-PCR Microfluidic Chip and Its Detection with a Capillary Electrophoresis System

Amplification of Escherichia coli in a Continuous-Flow-PCR Microfluidic Chip and Its Detection with a Capillary Electrophoresis System

Published on: November 21, 2023

High-performance capillary gel electrochromatography with replaceable media.

M R Schure¹, R E Murphy, W L Klotz

¹Rohm and Haas Company, 727 Norristown Road, Spring House, Pennsylvania, 19477.

Analytical Chemistry

|June 8, 2011

Summary

This summary is machine-generated.

This study introduces a novel capillary gel electrochromatography method using entangled polymers for efficient separations. High-velocity operation minimizes diffusion, enabling fast and reproducible analytical results.

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Sheathless Capillary Electrophoresis–Mass Spectrometry for Metabolic Profiling of Biological Samples

Sheathless Capillary Electrophoresis–Mass Spectrometry for Metabolic Profiling of Biological Samples

Published on: October 1, 2016

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Last Updated: Jun 1, 2026

Amplification of Escherichia coli in a Continuous-Flow-PCR Microfluidic Chip and Its Detection with a Capillary Electrophoresis System

Amplification of Escherichia coli in a Continuous-Flow-PCR Microfluidic Chip and Its Detection with a Capillary Electrophoresis System

Published on: November 21, 2023

Sheathless Capillary Electrophoresis–Mass Spectrometry for Metabolic Profiling of Biological Samples

Sheathless Capillary Electrophoresis–Mass Spectrometry for Metabolic Profiling of Biological Samples

Published on: October 1, 2016

Area of Science:

Analytical Chemistry
Separation Science
Chromatography

Background:

Capillary electrochromatography (CEC) offers high separation efficiency.
Developing novel stationary phases is crucial for advancing CEC techniques.
Entangled polymer solutions present a unique medium for chromatographic separations.

Purpose of the Study:

To evaluate the performance of capillary gel electrochromatography (CGC) utilizing entangled polymer solutions.
To investigate the separation characteristics and efficiency of a novel fritless CGC system.
To explore the potential of polyacid-based polymers with grafted hydrophobic segments as a dual-function stationary phase.

Main Methods:

A polymer solution with an acid backbone and grafted hydrophobic segments was pumped into a capillary under fritless conditions.
The entangled polymer solution served as both the mobile phase and the stationary phase, providing electroosmotic flow and retention.
Plate height analysis was conducted to determine zone broadening mechanisms and optimize separation conditions.

Main Results:

The CGC system demonstrated performance comparable to capillary electrophoresis and other electrochromatographic methods.
Zone broadening was primarily attributed to diffusion, suggesting optimal performance at high velocities (high voltages).
Successful separations were achieved for various analytes, including alkyl benzoates, alkylphenones, alkylbenzenes, oxidation inhibitors, and polycyclic aromatic hydrocarbons (PAHs).

Conclusions:

Entangled polymer solutions in fritless CGC offer a promising approach for high-performance separations.
The system allows for rapid stationary phase replacement and exhibits a retention mechanism similar to reversed-phase liquid chromatography.
Limitations include low sample loadability and limited solvent compatibility, warranting further optimization for broader applications.