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Ion-Exchange Chromatography

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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...

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Cell separation was first achieved in 1964 by S. H. Seal, who separated large tumor cells from the smaller blood cells using filtration. Two years later, Pohl and Hawk performed experiments on how cells respond differently to a nonuniform electric field based on the cell type. Such observations were the inception of cell separation methods, which allow isolating a single cell type from a heterogeneous sample.

Ion Exchange

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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...

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Related Experiment Video

Updated: Jun 13, 2026

Green Synthesis of Quinoline-Based Ionic Liquid

Green Synthesis of Quinoline-Based Ionic Liquid

Published on: September 27, 2024

Recent applications of ionic liquids in separation technology.

Dandan Han¹, Kyung Ho Row

¹Department of Chemical Engineering, Inha University, Incheon, Korea. hdd_216@hotmail.com

Molecules (Basel, Switzerland)

|April 30, 2010

Summary

Ionic liquids (ILs) offer tunable properties for diverse separation techniques, including membranes, chromatography, and sample preparation. Research into IL applications in separations is rapidly expanding, highlighting their future potential.

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Area of Science:

Green Chemistry
Analytical Chemistry
Materials Science

Background:

Ionic liquids (ILs) are tunable solvents with diverse applications.
Their unique properties stem from various cation and anion combinations.
ILs are increasingly explored for separation technologies.

Purpose of the Study:

To provide an overview of IL applications in separation technology.
To discuss the potential of ILs in various separation techniques.
To highlight the growing academic interest in ILs for separations.

Main Methods:

Literature review of IL applications in separation science.
Analysis of ILs in membranes, chromatography, and extraction.
Discussion of IL properties and phase behavior.

Main Results:

Ionic liquids are versatile for membranes, chromatography, and sample preparation.
Tunable properties of ILs allow for tailored separation processes.
The field of ILs in separations is experiencing significant growth.

Conclusions:

Ionic liquids show great promise for advancing separation technologies.
Further research is warranted to fully exploit IL capabilities in separations.
The versatility of ILs positions them as key materials for future separation innovations.