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Related Concept Videos

Two-dimensional Gel Electrophoresis01:22

Two-dimensional Gel Electrophoresis

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 as  cells...
Electrophoresis: Overview01:20

Electrophoresis: Overview

Electrophoresis is a powerful analytical separation technique that relies on the differential migration of charged species when subjected to an electric field. The core strength of electrophoresis lies in its ability to separate high-molecular-weight species in complex mixtures. It has found widespread use in biochemistry, molecular biology, and analytical chemistry, allowing the separation of compounds like amino acids, nucleotides, carbohydrates, and proteins with excellent resolution.
There...
Capillary Electrophoresis: Applications01:30

Capillary Electrophoresis: Applications

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,...
Capillary Electrophoresis: Instrumentation01:20

Capillary Electrophoresis: Instrumentation

Capillary electrophoresis instrumentation typically consists of several key components. A high-voltage power supply generates the electric field necessary for the separation by connecting to an anode (the positively charged electrode) and a cathode (the negatively charged electrode) located in buffer reservoirs at each end of the capillary tube. The system includes a sample vial, a fused silica capillary tube coated with polyimide for mechanical strength through which the sample components...
Centrifugation01:05

Centrifugation

Centrifugation is a separation technique based on differences in density or size. It is commonly used to separate solids from aqueous interferents. During centrifugation, the sample is placed in centrifugation tubes and spun at high angular velocity, which allows centrifugal force to act differentially on the different densities or masses of the components. After spinning, the supernatant liquid is decanted. Depending on the specific application, either the pellet or the supernatant is retained...
SDS-PAGE01:27

SDS-PAGE

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 proteins...

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Electrophoretic Separation of Proteins
08:17

Electrophoretic Separation of Proteins

Published on: June 12, 2008

Variations on a theme: changes to electrophoretic separations that can make a difference.

Thierry Rabilloud1

  • 1CNRS UMR5092, Biochemistry and Biophysics of Integrated Systems, CEA Grenoble, iRTSV/BSBBSI, Grenoble, France. Thierry.Rabilloud@cea.fr

Journal of Proteomics
|April 17, 2010
PubMed
Summary

This review explores variations in sodium dodecyl sulfate (SDS) electrophoresis and two-dimensional electrophoresis techniques for protein separation in proteomics. Understanding these modifications can optimize protein analysis when standard protocols reach their limits.

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Area of Science:

  • Proteomics
  • Biochemistry
  • Analytical Chemistry

Background:

  • Electrophoretic separations, particularly SDS electrophoresis, are fundamental to proteomic analyses.
  • Standard protocols for SDS electrophoresis are robust but have limitations.
  • Variations in electrophoretic parameters exist in scientific literature.

Purpose of the Study:

  • To review key variations in SDS electrophoresis and two-dimensional electrophoresis.
  • To inform researchers on optimizing protein separation techniques.
  • To enhance protein analysis capabilities in proteomics.

Main Methods:

  • Review of literature on electrophoretic separation variations.
  • Focus on chemical variations including gel structure, buffer systems, and detergents.
  • Examination of two-dimensional electrophoresis variations (isoelectric focusing and cationic zone electrophoresis).

Main Results:

  • Numerous variations in gel structure, buffer systems, and detergents for SDS electrophoresis are documented.
  • Different approaches for two-dimensional electrophoresis, including isoelectric focusing and cationic zone electrophoresis, offer alternative separation strategies.
  • These variations provide means to overcome limitations of classical protocols.

Conclusions:

  • Optimizing electrophoretic parameters can significantly improve protein separation in proteomics.
  • Researchers can tune protocols based on specific analytical needs.
  • Knowledge of these variations is crucial for advancing proteomic studies.