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Ion Exchange

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...

Gas Chromatography: Types of Columns and Stationary Phases

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...

Extraction: Advanced Methods

Extraction: Advanced Methods

Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is formed in...

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,...

Analyte Adsorption and Distribution

Analyte Adsorption and Distribution

In certain chromatographic separations, solutes transfer between the mobile phase and the stationary phase via sorption, which typically refers to the process of adsorption. For many chromatographic systems, the sorption process often depends on the polarity of the compounds—an expression of the overall dipole moment within the molecule. During the separation process, there is competition between the solute and solvent for adsorption to the stationary phase. Highly polar compounds and solvents...

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Related Experiment Video

Updated: May 10, 2026

A Simple Method for Automated Solid Phase Extraction of Water Samples for Immunological Analysis of Small Pollutants

A Simple Method for Automated Solid Phase Extraction of Water Samples for Immunological Analysis of Small Pollutants

Published on: January 1, 2016

[Advances of molecularly imprinted polymers for solid phase extraction].

Jinhua Li¹, Yingying Wen, Lingxin Chen

¹Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, China.

Se Pu = Chinese Journal of Chromatography

|June 22, 2013

Summary

Molecularly imprinted polymers (MIPs) offer advanced chromatographic sample preparation. This review covers MIPs in various extraction techniques, discussing challenges and future directions for improved analytical methods.

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Area of Science:

Polymer Science
Analytical Chemistry
Separation Science

Context:

Chromatographic techniques are essential for sample analysis.
Molecularly imprinted polymers (MIPs) are increasingly utilized as selective adsorbents.
Developing efficient sample preparation methods is crucial for accurate chromatographic analysis.

Purpose:

To summarize recent advancements in MIPs for chromatographic sample pretreatment.
To review various MIP-based extraction methodologies.
To discuss challenges and propose future strategies for MIP applications.

Summary:

The review covers solid phase extraction, matrix solid phase dispersion extraction, solid phase microextraction, stir bar sorptive extraction, and magnetic material extraction using MIPs.
Challenges associated with MIP-based extraction are identified and potential solutions are explored.
Future perspectives on the application of MIPs in chromatography are presented.

Impact:

Provides a comprehensive overview of MIPs in chromatographic sample preparation.
Highlights key challenges and effective strategies for optimizing MIP-based extraction.
Offers insights into the future potential of MIPs for enhanced analytical separations.