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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,...

Chromatographic Resolution

Chromatographic Resolution

In chromatography, a solute moves through a chromatographic column and tends to spread, forming a Gaussian-shaped band. The longer the solute spends in the column, the broader the band becomes. The broadening can lead to overlaps within the column, affecting separation effectiveness.
The effectiveness of separation can be evaluated by determining the level of separation between two neighboring peaks in a chromatogram, which represents the individual components of a sample.
In chromatography,...

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...

Optimizing Chromatographic Separations

Optimizing Chromatographic Separations

Optimizing chromatographic separations is crucial for obtaining clean separations in a minimum amount of time. Optimization is required for several factors, including kinetic effects related to band broadening, plate height, capacity factor, and separation factor.
Band broadening refers to spreading solute bands as they travel through the column. This broadening can impact resolution. Plate height (H) represents the length required for one theoretical plate. A lower plate height corresponds to...

Affinity Chromatography

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...

Types Of Column Chromatography

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...

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Related Experiment Video

Updated: Jun 13, 2026

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

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

Published on: April 5, 2019

2-D chromatography with optimized size exclusion chromatography resolution and multi-angle light scattering coupling.

Stephan Moyses¹

¹Arkema Inc., King of Prussia, PA 19406, USA. stephan.moyses@arkema.com

Journal of Separation Science

|April 21, 2010

Summary

This study optimizes two-dimensional (2-D) chromatography for polymer analysis, improving molecular weight resolution without extending experiment times. The enhanced method achieves 1-D size exclusion chromatography (SEC) resolution in the SEC dimension for better polymer 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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Characterization of Proteins by Size-Exclusion Chromatography Coupled to Multi-Angle Light Scattering (SEC-MALS)

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Online Size-exclusion and Ion-exchange Chromatography on a SAXS Beamline

Online Size-exclusion and Ion-exchange Chromatography on a SAXS Beamline

Published on: January 5, 2017

Area of Science:

Polymer Chemistry and Engineering
Analytical Chemistry
Chromatographic Techniques

Background:

Two-dimensional (2-D) chromatography is crucial for polymer chemists and engineers to understand polymerization mechanisms and structure-property relationships.
Achieving high resolution in 2-D chromatography is essential for distinguishing subtle compositional and molecular weight differences in polymers.
Balancing high resolution with short analysis times is a persistent challenge in 2-D chromatographic experiments.

Purpose of the Study:

To investigate optimal conditions for enhanced 2-D resolution, with a specific focus on improving the molecular weight dimension.
To address the typically lower resolution in the size exclusion chromatography (SEC) dimension of 2-D systems.
To develop a method that provides 1-D SEC resolution within a practical analysis time.

Main Methods:

Utilized a model polymer system to explore and optimize 2-D chromatographic conditions.
Focused on improving the molecular weight separation dimension, often limited by synchronization and rapid SEC column requirements.
Employed a multi-angle light scattering (MALS) detector to determine the radius of gyration of eluted polymers.

Main Results:

Developed a 2-D chromatography method that achieves resolution in the SEC dimension comparable to standard 1-D SEC methods.
Maintained relatively short analysis times despite the enhanced resolution in the molecular weight dimension.
Successfully determined polymer radius of gyration using MALS detection in conjunction with the optimized 2-D separation.

Conclusions:

The optimized 2-D chromatography method offers a practical solution for detailed polymer analysis, enhancing molecular weight characterization.
This approach effectively overcomes the trade-off between resolution and analysis time in 2-D polymer separations.
The integration of MALS detection provides valuable insights into polymer conformation (radius of gyration) alongside detailed separation.