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Related Concept Videos

Two-dimensional Gel Electrophoresis01:22

Two-dimensional Gel Electrophoresis

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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...
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Electrophoresis: Overview01:20

Electrophoresis: Overview

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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...
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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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DNA Agarose Gel Electrophoresis02:35

DNA Agarose Gel Electrophoresis

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Agarose gel electrophoresis is a laboratory technique commonly used to separate DNA fragments by size. However, it can also be used to isolate and purify DNA fragments using a gel extraction protocol.
Gel extraction follows five major steps: running gel electrophoresis to separate fragments, isolating the individual bands, extracting DNA from those bands, and removing the dye and salts from the extracted mixture to obtain pure DNA.
In cloning experiments, both the insert and vector DNA...
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Two-Dimensional Microscopy in Microbiology01:29

Two-Dimensional Microscopy in Microbiology

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Two-dimensional (2D) microscopy encompasses a range of optical techniques that capture images within a single focal plane, offering detailed representations of microscopic structures. These techniques are essential in biological and medical research, enabling the visualization of cellular and subcellular structures with different levels of contrast and specificity.There are several major types of 2D microscopy, each with strengths and applications.Bright-Field MicroscopyBright-field microscopy...
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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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Updated: Feb 21, 2026

Selective Labelling of Cell-surface Proteins using CyDye DIGE Fluor Minimal Dyes
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Selective Labelling of Cell-surface Proteins using CyDye DIGE Fluor Minimal Dyes

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Comparative Two-Dimensional Fluorescence Gel Electrophoresis.

Doreen Ackermann1, Simone König2

  • 1Interdisziplinäres Zentrum für Klinische Forschung, IZKF Core Unit Proteomics, University of Münster, Röntgenstr. 21, 48149, Münster, Germany.

Methods in Molecular Biology (Clifton, N.J.)
|October 12, 2017
PubMed
Summary
This summary is machine-generated.

Two-dimensional comparative fluorescence gel electrophoresis (CoFGE) improves protein analysis reproducibility without replicates. This method uses a standardized marker grid to correct gel variations, enabling accurate protein spot comparisons.

Keywords:
2D-PAGEComparative fluorescence gel electrophoresisProtein coordinatesProtein gridhCoFGE

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Fluorescent Silver Staining of Proteins in Polyacrylamide Gels
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Two-dimensional Gel Electrophoresis Coupled with Mass Spectrometry Methods for an Analysis of Human Pituitary Adenoma Tissue Proteome
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Fluorescent Silver Staining of Proteins in Polyacrylamide Gels
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Area of Science:

  • Proteomics
  • Biochemistry
  • Analytical Chemistry

Background:

  • Reproducible protein identification is crucial for comparative proteomics.
  • Differential gel electrophoresis (DIGE) requires replicates, limiting its use for certain sample types.
  • Existing methods may struggle with gel-to-gel variability in 2D electrophoresis.

Purpose of the Study:

  • To introduce and validate Two-dimensional Comparative Fluorescence Gel Electrophoresis (CoFGE) as a robust method for protein analysis.
  • To enhance the reproducibility of coordinate assignment for protein spots in 2D polyacrylamide gels.
  • To provide a reliable alternative for sample comparison when replicates are unavailable.

Main Methods:

  • CoFGE employs an internal standard, a standardized marker grid of 80-100 purified protein nodes.
  • The marker grid is co-run with the sample proteome on 2D polyacrylamide gels.
  • Two fluorescent dyes differentiate reference and analyte, correcting for y-dimension (molecular weight) variations; azo dyes can optionally control the x-dimension (pI).
  • Horizontal electrophoresis (hCoFGE) is noted as easier to perform than vertical setups.

Main Results:

  • CoFGE significantly increases the reproducibility of coordinate assignment for protein spots.
  • The method effectively corrects for gel-to-gel variability using the internal marker grid.
  • Successful application is demonstrated for samples requiring comparison without replicates.

Conclusions:

  • CoFGE offers a reproducible and reliable approach for comparative proteomics, especially when replicates are not feasible.
  • The use of an internal marker grid is key to correcting gel variations and ensuring accurate data.
  • CoFGE is a valuable technique for researchers needing to compare protein profiles accurately across different gels.