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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,...

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Related Experiment Video

Updated: Jun 23, 2026

Combining X-Ray Crystallography with Small Angle X-Ray Scattering to Model Unstructured Regions of Nsa1 from S. Cerevisiae

Combining X-Ray Crystallography with Small Angle X-Ray Scattering to Model Unstructured Regions of Nsa1 from S. Cerevisiae

Published on: January 10, 2018

Adaptable SEC-SAXS data collection for higher quality structure analysis in solution.

Tsutomu Matsui¹, Ivan Rajkovic¹, Blaine H M Mooers^2,3,4

¹Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, California, USA.

Protein Science : a Publication of the Protein Society

|March 19, 2024

Summary

New synchrotron size-exclusion chromatography coupled with small-angle x-ray scattering (SEC-SAXS) methods improve sample separation and reduce radiation damage. These techniques offer more reliable structural analysis and faster scientific discovery.

Keywords:

SEC-SAXS data quality assessment SSRL BL4-2 baseline correction-free analysis improved SAXS data quality oligomeric samples peak resolution radiation damage sample cell fouling size exclusion chromatography small-angle x-ray scattering

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Structural Studies of Macromolecules in Solution using Small Angle X-Ray Scattering

Structural Studies of Macromolecules in Solution using Small Angle X-Ray Scattering

Published on: November 5, 2018

Analysis of SEC-SAXS data via EFA deconvolution and Scatter

Analysis of SEC-SAXS data via EFA deconvolution and Scatter

Published on: January 28, 2021

Related Experiment Videos

Last Updated: Jun 23, 2026

Combining X-Ray Crystallography with Small Angle X-Ray Scattering to Model Unstructured Regions of Nsa1 from S. Cerevisiae

Combining X-Ray Crystallography with Small Angle X-Ray Scattering to Model Unstructured Regions of Nsa1 from S. Cerevisiae

Published on: January 10, 2018

Structural Studies of Macromolecules in Solution using Small Angle X-Ray Scattering

Structural Studies of Macromolecules in Solution using Small Angle X-Ray Scattering

Published on: November 5, 2018

Analysis of SEC-SAXS data via EFA deconvolution and Scatter

Analysis of SEC-SAXS data via EFA deconvolution and Scatter

Published on: January 28, 2021

Area of Science:

Biophysical chemistry
Structural biology
Materials science

Background:

Synchrotron size-exclusion chromatography coupled with small-angle x-ray scattering (SEC-SAXS) faces challenges with overlapping peaks and sample cell fouling.
Existing post-experimental analysis techniques attempt to address these data limitations.

Purpose of the Study:

To present three novel data collection modes for SEC-SAXS at the Stanford Synchrotron Radiation Lightsource (SSRL) BioSAXS Beamline 4-2.
To overcome common challenges in SEC-SAXS experiments, enhancing data quality and experimental efficiency.

Main Methods:

High-Resolution mode utilizing Ultra-High-Performance Liquid Chromatography (UHPLC) for superior peak separation and minimal peak broadening.
Implementation of analytical SEC columns with small bed volumes to reduce sample dilution and enable higher concentration measurements.
Radiation damage mitigation strategies including sample cell cleaning and optimized X-ray shutter control.
Introduction of High-Throughput and Co-Flow modes for increased experimental agility.

Main Results:

The High-Resolution mode achieves excellent sample separation and accurate background subtraction comparable to conventional methods.
Minimized sample dilution and potential for higher sample concentrations improve sample economy.
Radiation damage issues are effectively managed, ensuring cleaner sample cells and reliable data.
The new modes facilitate more accurate downstream structural analysis and accelerate scientific research.

Conclusions:

The developed SEC-SAXS data collection modes at SSRL BL4-2 significantly enhance experimental capabilities.
These methods address key limitations in peak overlap and radiation damage, leading to improved data reliability.
The enhanced techniques provide researchers with more efficient and accurate tools for structural analysis, enabling quicker scientific advancements.