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Related Concept Videos

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...
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...
Proteomics01:33

Proteomics

A proteome is the entire set of proteins that a cell type produces. We can study proteomes using the knowledge of genomes because genes code for mRNAs, and the mRNAs encode proteins. Although mRNA analysis is a step in the right direction, not all mRNAs are translated into proteins.
Proteomics is the study of proteomes' function. It involves the large-scale systematic study of the proteome to denote the protein complement expressed by a genome. Scientist Mark Wilkins coined the term proteomics...

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Related Experiment Video

Updated: May 21, 2026

Two-dimensional Gel Electrophoresis Coupled with Mass Spectrometry Methods for an Analysis of Human Pituitary Adenoma Tissue Proteome
12:34

Two-dimensional Gel Electrophoresis Coupled with Mass Spectrometry Methods for an Analysis of Human Pituitary Adenoma Tissue Proteome

Published on: April 2, 2018

Proteome analysis with classical 2D-PAGE.

Caroline May1, Frederic Brosseron, Kathy Pfeiffer

  • 1Department of Medical Proteomics/Bionalaytics, Medizinisches Proteom-Center, Ruhr-Universität Bochum, Bochum, Germany. caroline.may@rub.de

Methods in Molecular Biology (Clifton, N.J.)
|June 6, 2012
PubMed
Summary
This summary is machine-generated.

Two-dimensional polyacrylamide gel electrophoresis (2D-PAGE) combines isoelectric focusing (IEF) and SDS-PAGE for protein separation. Detailed protocols are provided for both carrier-ampholine (CA)-based and immobilized pH gradient (IPG)-based IEF.

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Last Updated: May 21, 2026

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Published on: October 15, 2019

Area of Science:

  • Proteomics
  • Biochemistry
  • Molecular Biology

Background:

  • Two-dimensional polyacrylamide gel electrophoresis (2D-PAGE) is a powerful technique for separating complex protein mixtures.
  • It combines two orthogonal separation methods: isoelectric focusing (IEF) and SDS-PAGE.
  • IEF separates proteins based on their isoelectric point, while SDS-PAGE separates them by molecular weight.

Purpose of the Study:

  • To provide detailed protocols for performing 2D-PAGE.
  • To cover both carrier-ampholine (CA)-based and immobilized pH gradient (IPG)-based IEF methods.
  • To enable researchers to effectively visualize and quantify proteins after separation.

Main Methods:

  • Proteins are first separated by isoelectric point using either CA-based IEF or IPG-based IEF.
  • In the second dimension, proteins are separated by electrophoretic mobility using SDS-PAGE.
  • Visualization and quantification are achieved through staining methods like Coomassie, silver, or fluorescence.

Main Results:

  • Established detailed protocols for implementing 2D-PAGE with both IEF variants.
  • Demonstrated the combined power of IEF and SDS-PAGE for high-resolution protein separation.
  • Outlined various staining techniques for protein detection and quantification.

Conclusions:

  • 2D-PAGE is a versatile technique for comprehensive proteome analysis.
  • The choice between CA-based and IPG-based IEF depends on specific experimental needs.
  • Accurate protein visualization and quantification are crucial for interpreting 2D-PAGE results.