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Related Concept Videos

Silica Gel Column Chromatography: Overview01:10

Silica Gel Column Chromatography: Overview

Silica gel column chromatography is a technique for separating compounds using a column packed with silica gel as the stationary phase. This method relies on differences in the polarity of compounds. Based on their polarities, compounds move between the stationary phase (silica gel) and the mobile phase (the solvent), forming discrete bands in the column.
Polar components tend to bind strongly to the silica gel, causing them to move slowly through the column. In contrast, nonpolar compounds...
Principles Of Column Chromatography01:13

Principles Of Column Chromatography

The chromatography technique was first invented in 1901 by Michael S. Tswett, a Russian botanist, to separate plant pigments using organic solvents. Further, in 1941, Archer John Porter Martin and R. L. M. Synge modified the technique by packing silica gel into a column. A mixture of amino acids was then separated on the packed column using chloroform and water mixture as the mobile phase. This was the first report on column chromatography. At present, column chromatography is a widely used...
High-Performance Liquid Chromatography: Introduction01:11

High-Performance Liquid Chromatography: Introduction

High-performance liquid chromatography(HPLC), formerly referred to as High-pressure liquid chromatography, is a powerful technique used to separate, identify, and quantify components in complex mixtures. The term "high pressure" refers to using high pressure to push the liquid mobile phase through the tightly packed columns.
In HPLC, two phases play a critical role in the separation process:
Electrophoresis: Overview01:20

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: Instrumentation01:20

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...
Capillary Electrophoresis: Applications01:30

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,...

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Updated: Jul 12, 2026

Curtain Flow Column: Optimization of Efficiency and Sensitivity
06:44

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Published on: June 12, 2016

Capillary electrochromatography on silica columns: factors influencing performance.

K D Bartle1, R A Carney, A Cavazza

  • 1School of Chemistry, University of Leeds, UK. K.D.Bartle@chem.leeds.ac.uk

Journal of Chromatography. A
|October 25, 2000
PubMed
Summary

Capillary electrochromatography (CEC) utilizes bonded silica packings for separations. Mobile phase variables like pH and temperature influence electroosmotic flow (EOF) and selectivity, offering control over the process.

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Area of Science:

  • Analytical Chemistry
  • Separation Science
  • Chromatography

Background:

  • Capillary electrochromatography (CEC) commonly employs bonded silica packings due to their availability and well-understood chemistry.
  • Existing High-Performance Liquid Chromatography (HPLC) methods can potentially be transferred to CEC, leveraging established separation principles.

Purpose of the Study:

  • To investigate packing methods for preparing CEC columns.
  • To analyze the influence of mobile phase variables on CEC performance.
  • To understand the impact of bonded groups on electroosmotic flow (EOF).

Main Methods:

  • Investigation of packing methods for CEC column preparation.
  • Systematic study of mobile phase variables including ionic strength, organic content, and pH.
  • Evaluation of temperature as a variable for altering column selectivity.
  • Analysis of pH effects on EOF for different bonded stationary phases.

Main Results:

  • Burned-in frits pose challenges, but can be mitigated by minimizing length and silanization.
  • Mobile phase variables (ionic strength, organic content, pH) influence CEC as predicted by theory.
  • Temperature effectively modifies column selectivity in CEC.
  • pH significantly impacts EOF for neutral bonded groups but less so for bonded sulfonic acid groups.
  • Reversal of EOF is achievable with bonded groups containing nitrogen.

Conclusions:

  • Bonded silica packings are versatile for CEC, with established methods and predictable responses to mobile phase variations.
  • Temperature and mobile phase composition offer tunable control over CEC separations and EOF.
  • The choice of bonded group significantly influences EOF behavior, providing avenues for method optimization.