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Related Concept Videos

Size-Exclusion Chromatography01:08

Size-Exclusion Chromatography

2.5K
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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Detergent Purification of Membrane Proteins01:18

Detergent Purification of Membrane Proteins

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Detergents are used to purify the integral proteins of the membrane. The hydrophobic portion of the detergent can replace membrane phospholipids while solubilizing the membrane proteins. When detergent monomers reach a specific concentration in a solution called critical micelle concentration (CMC), they form micelles. Above CMC, the concentration of the detergent monomers remains in equilibrium with the micelle. The number of detergent monomers present in the CMC varies for each detergent, and...
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SDS-PAGE01:27

SDS-PAGE

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Gel electrophoresis is a method that separates biological macromolecules like nucleic acids or proteins by forcing them to pass through a gel matrix under an electric field.
A variation of gel electrophoresis, termed  polyacrylamide gel electrophoresis (PAGE), is commonly used for separating proteins according to their molecular size by passing them through a polyacrylamide gel. Because of the varying charges associated with amino acid side chains, PAGE can be used to separate intact...
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Capillary Electrophoresis: Applications01:30

Capillary Electrophoresis: Applications

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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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Two-dimensional Gel Electrophoresis01:22

Two-dimensional Gel Electrophoresis

8.2K
Two-dimensional gel electrophoresis is a high-resolution protein separation method first introduced by O' Farrell and Klose in 1975. This method involves protein separation by two dimensions, mass and charge, making it more accurate than one-dimensional gel electrophoresis.
The first dimension separation uses the isoelectric focusing or IEF technique performed on immobilized pH gradient (IPG) strips that separate proteins according to their isoelectric points.
Biological samples, such...
8.2K

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Related Experiment Video

Updated: Mar 25, 2026

Characterization of Proteins by Size-Exclusion Chromatography Coupled to Multi-Angle Light Scattering SEC-MALS
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Characterization of Proteins by Size-Exclusion Chromatography Coupled to Multi-Angle Light Scattering SEC-MALS

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Characterising protein/detergent complexes by triple-detection size-exclusion chromatography.

Katharina Gimpl1, Jessica Klement1, Sandro Keller1

  • 1Molecular Biophysics, University of Kaiserslautern, Erwin-Schrödinger-Str. 13, 67663 Kaiserslautern, Germany.

Biological Procedures Online
|February 17, 2016
PubMed
Summary

This study presents a triple-detection size-exclusion chromatography protocol to accurately determine detergent binding to membrane proteins. This method aids researchers in experimental design and data analysis for membrane protein studies.

Keywords:
Absolute mass determinationDetergent micellesMembrane proteinsMultiple detectionStatic light scattering

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Area of Science:

  • Biochemistry
  • Analytical Chemistry
  • Structural Biology

Background:

  • Detergents are crucial for in vitro membrane protein studies, but the bound detergent amount is often unknown.
  • Accurate detergent quantification is vital for experimental design and data interpretation in membrane protein research.
  • Traditional methods lack the precision to determine detergent stoichiometry for membrane protein complexes.

Purpose of the Study:

  • To establish and validate a robust protocol for triple-detection size-exclusion chromatography (TD-SEC).
  • To enable accurate determination of detergent bound to membrane proteins.
  • To provide a method for characterizing both routine and complex membrane protein samples.

Main Methods:

  • Triple-detection size-exclusion chromatography (TD-SEC) was employed.
  • Simultaneous separation of protein/detergent complexes and detergent micelles.
  • Absolute molar mass determination using ultraviolet absorbance, static light scattering, and refractive index detection.

Main Results:

  • A refined TD-SEC protocol was developed for challenging membrane protein samples.
  • The protocol allows for accurate characterization of protein/detergent complexes in various solvents.
  • Troubleshooting guidance and discussion of limitations are provided for broader applicability.

Conclusions:

  • The validated TD-SEC protocol empowers users to measure protein/detergent complexes accurately.
  • The method facilitates mass determination under demanding separation conditions.
  • This technique enhances the study of membrane proteins by quantifying detergent interactions.