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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...
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...
DNA Agarose Gel Electrophoresis02:35

DNA Agarose Gel Electrophoresis

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...
Simple Staining Technique01:24

Simple Staining Technique

OverviewStaining techniques in microscopy enhance the visualization of microorganisms by increasing contrast and allowing the differentiation of cellular structures. Simple staining is one of the fundamental methods used to observe the basic morphological characteristics of microorganisms, including their size, shape, and arrangement. This method relies on the application of a single dye to stain the entire cell, producing a clear contrast between the cell and the background.FixationFixation is...
Special Staining Techniques01:13

Special Staining Techniques

Specialized staining techniques play a vital role in microbiology by enabling the visualization of specific bacterial structures that remain undetectable with standard microscopy methods. These techniques not only enhance the structural visualization of bacterial cells but also provide critical insights into their pathogenicity and classification. Additionally, they support diagnostic and research endeavors in microbiology by identifying key bacterial features.Capsule Staining for Virulence...
Fixation and Sectioning01:03

Fixation and Sectioning

Two basic types of preparation are used to visualize specimens with a light microscope: wet mounts and fixed specimens.
The simplest type of preparation is the wet mount, in which the specimen is placed in a drop of liquid on the slide. A liquid specimen can be directly deposited on the slide using a dropper. Solid specimens, such as skin scraping, can be placed on the slide before adding a drop of liquid to prepare the wet mount. Sometimes the liquid is simply water, but stains are often added...

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Related Experiment Video

Updated: Jun 19, 2026

Staining Proteins in Gels
10:55

Staining Proteins in Gels

Published on: July 8, 2008

Protein gel staining methods: an introduction and overview.

Thomas H Steinberg1

  • 1McArdle Laboratory for Cancer Research, University of Wisconsin-Madison, Madison, Wisconsin, USA.

Methods in Enzymology
|November 7, 2009
PubMed
Summary

Choosing the right protein gel stain is crucial for accurate detection and quantitation in biochemistry. Various methods, including colorimetric and fluorescent stains, offer different sensitivities and applications for protein analysis.

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Last Updated: Jun 19, 2026

Staining Proteins in Gels
10:55

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Published on: July 8, 2008

DNA Staining Method Based on Formazan Precipitation Induced by Blue Light Exposure
08:11

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Staining of Proteins in Gels with Coomassie G-250 without Organic Solvent and Acetic Acid
07:47

Staining of Proteins in Gels with Coomassie G-250 without Organic Solvent and Acetic Acid

Published on: August 14, 2009

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Analytical Chemistry

Background:

  • Protein purity assessment is a fundamental step in laboratory research.
  • Sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) is a standard technique for protein separation.
  • Effective detection and characterization of proteins post-electrophoresis are critical for reliable results.

Purpose of the Study:

  • To review and compare various protein gel staining and detection methods.
  • To guide scientists in selecting appropriate techniques for protein purity, quantitation, and characterization.
  • To highlight considerations for downstream applications and experimental constraints.

Main Methods:

  • Colorimetric staining methods (e.g., Coomassie Blue, silver staining).
  • Fluorescent staining methods for total protein and specific modifications.
  • Instrumentation-based methods for sensitive protein quantitation.
  • Sequential staining protocols for purity assessment and modification profiling.

Main Results:

  • Colorimetric stains provide a basic total protein profile.
  • Fluorescent stains offer higher sensitivity, broader linear dynamic range, and enable detection of post-translational modifications (PTMs).
  • Multiple staining techniques can be used in series for comprehensive analysis.
  • Nonfixative stains facilitate subsequent western blotting.

Conclusions:

  • The selection of a protein gel staining method depends on the required sensitivity, quantitation rigor, and downstream analytical needs.
  • Fluorescence-based methods provide superior sensitivity and are suitable for PTM analysis.
  • Method choice is influenced by available equipment, budget, and experimental goals, including compatibility with mass spectrometry or peptide sequencing.