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Related Concept Videos

Ion-Exchange Chromatography01:09

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...
Ion Exchange01:17

Ion Exchange

Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or basic...
Types Of Column Chromatography01:29

Types Of Column Chromatography

The stability and compatibility of column material with samples are crucial for efficient purification in chromatographic techniques. Various operating parameters such as pH, temperature, or solvent affect the packing of the column material, thereby determining the purification efficiency. The choice of column material also plays an essential role in deciding the operating parameters and can be modified based on the proteins that need to be purified.
Gel Filtration Chromatography
When the...
Affinity Chromatography01:03

Affinity Chromatography

Affinity chromatography is a powerful technique extensively utilized for separating and purifying specific biomolecules from complex mixtures. It capitalizes on the highly selective binding between an analyte and its counterpart, such as antibody-antigen interactions. The counterpart is immobilized on the stationary phase, forming an affinity column. The stationary phase typically consists of solid support, such as agarose or porous glass beads, immobilizing the affinity ligand. The mobile...
Gas Chromatography: Types of Columns and Stationary Phases01:17

Gas Chromatography: Types of Columns and Stationary Phases

Gas chromatography (GC) relies on stationary phases to separate and analyze components in a sample. There are two main types of stationary phases: liquid and solid. Liquid stationary phases are non-volatile, thermally stable, and chemically inert liquids coated onto the column. Solid stationary phases are particles of adsorbent material, such as silica gel or molecular sieves.
For an analyte to remain on the column for a sufficient amount of time, it must exhibit some level of compatibility (or...
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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Related Experiment Video

Updated: Jun 19, 2026

Ion Exchange Chromatography (IEX) Coupled to Multi-angle Light Scattering (MALS) for Protein Separation and Characterization
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Ion Exchange Chromatography (IEX) Coupled to Multi-angle Light Scattering (MALS) for Protein Separation and Characterization

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Fast ion chromatography using short anion exchange columns.

Eadaoin Tyrrell1, Robert A Shellie, Emily F Hilder

  • 1Australian Centre for Research on Separation Science (ACROSS), School of Chemistry, University of Tasmania, Private Bag 75, Hobart, TAS 7001, Australia.

Journal of Chromatography. A
|October 23, 2009
PubMed
Summary

This study optimized ion chromatography for faster anion separation using shorter columns and varied eluent profiles. A novel isocratic method approximates gradient efficiency, enhancing sample throughput.

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Area of Science:

  • Analytical Chemistry
  • Chromatography

Background:

  • Ion chromatography is crucial for analyzing anions in various matrices.
  • Optimizing separation efficiency and speed is essential for high-throughput analysis.

Purpose of the Study:

  • To develop a fast ion chromatographic system for anion separation.
  • To maximize performance and resolution using shorter columns and optimized eluent profiles.
  • To compare isocratic and gradient elution for efficient separation of seven target anions.

Main Methods:

  • Utilized a short (4mm ID, 50mm long) anion-exchange column (Dionex AS20).
  • Employed a hydroxide eluent with varying concentrations and flow rates.
  • Investigated isocratic and gradient elution profiles, analyzing normalized gradient ramp rates.

Main Results:

  • Achieved separation of seven anions (chloride, chlorate, nitrate, chromate, sulfate, thiocyanate, perchlorate).
  • Identified maximum efficiency at a normalized gradient ramp rate of 5 mM/t(0) (peak capacity of 16).
  • Determined fastest separation (<3 min) at a normalized ramp rate of 30 mM/t(0).
  • Found that isocratic separation can approximate maximum gradient elution peak capacity.

Conclusions:

  • A fast ion chromatography system was developed using optimized parameters.
  • Isocratic elution can mimic gradient elution's high peak capacity, simplifying analysis.
  • This approach reduces re-equilibration time, increasing sample throughput, especially in multidimensional chromatography.