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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,...

Micelles

Micelles

Micelle formation is an intricate process that hinges on the properties of amphiphilic or amphipathic molecules and the conditions of the system in which they are found. Amphiphilic molecules, which have both hydrophilic (water-attracting) and hydrophobic (water-repelling) parts, play a critical role in this process.In aqueous environments, these molecules arrange themselves such that their hydrophilic heads are turned towards the water phase, while their hydrophobic tails are oriented away...

Size-Exclusion Chromatography

Size-Exclusion Chromatography

In size-exclusion chromatography (SEC), also known as molecular-exclusion or gel-permeation chromatography, molecules are separated based on their sizes. This technique is important for separating large molecules such as polymers and biomolecules. The two classes of micron-sized stationary phases encountered in SEC are silica particles and cross-linked polymer resin beads. Both materials are porous, but their pore sizes vary significantly.
Silica particles offer advantages such as rigidity,...

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...

SDS-PAGE

SDS-PAGE

Gel electrophoresis is a method that separates biological macromolecules like nucleic acids or proteins by forcing them to pass through a gel matrix under an electric field.
A variation of gel electrophoresis, termed polyacrylamide gel electrophoresis (PAGE), is commonly used for separating proteins according to their molecular size by passing them through a polyacrylamide gel. Because of the varying charges associated with amino acid side chains, PAGE can be used to separate intact proteins...

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...

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Related Experiment Video

Updated: Jul 13, 2026

A Technique for Stabilizing Membrane Proteins in Nanodiscs

A Technique for Stabilizing Membrane Proteins in Nanodiscs

Published on: April 30, 2026

Micelle stacking in micellar electrokinetic chromatography.

Braden C Giordano¹, Carl I D Newman, Philip M Federowicz

¹Naval Research Laboratory, 4555 Overlook Avenue, S.W., Chemistry Division, Code 6112, Washington, D.C. 20375-5342, USA.

Analytical Chemistry

|July 20, 2007

Summary

Micelle stacking in capillary electrophoresis is a dynamic process influenced by electrolyte conductivity and ion mobility. Understanding these factors enhances sample preconcentration and separation performance for neutral analytes.

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Last Updated: Jul 13, 2026

A Technique for Stabilizing Membrane Proteins in Nanodiscs

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Preparation and Characterization of Individual and Multi-drug Loaded Physically Entrapped Polymeric Micelles

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Assembly and Characterization of Polyelectrolyte Complex Micelles

Assembly and Characterization of Polyelectrolyte Complex Micelles

Published on: March 2, 2020

Area of Science:

Analytical Chemistry
Separation Science
Capillary Electrophoresis

Background:

Micellar electrokinetic chromatography (MEKC) utilizes micelles for sample preconcentration.
Understanding micelle stacking is crucial for optimizing MEKC performance.

Purpose of the Study:

To investigate the factors influencing micelle stacking in MEKC.
To correlate micelle stacking phenomena with separation performance.

Main Methods:

Preparation of various MEKC background electrolyte solutions with Sudan III.
Monitoring micelle stacking in anionic sodium dodecyl sulfate and sodium cholate micelle systems.
Quantification of micelle stacking extent and correlation with separation of neutral alkaloids.

Main Results:

Micelle stacking is a dynamic process dependent on relative conductivities, sample plug length, and ion mobilities.
Analyte enrichment increases with injection length but plateaus based on analyte-micelle affinity.
Long injection plugs can improve separation efficiency through interaction with growing stacked micelles.

Conclusions:

Micelle stacking is controllable by manipulating background electrolyte and sample conditions.
Optimized micelle stacking significantly enhances the separation and preconcentration of neutral analytes in MEKC.
The study challenges conventional wisdom regarding injection plug lengths for improved separation efficiency.