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Western Blotting

Western Blotting

Western blotting is an analytical technique for protein identification. It has various applications in immunology and medicine, including detecting diseases like bovine spongiform encephalopathy, mad cow disease, and human and feline immunodeficiency virus from biological samples.
The technique begins with separating proteins from the sample using sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE), followed by protein transfer, immunoblotting, and finally, protein detection.

Immunoprecipitation

Immunoprecipitation

Immunoprecipitation, or IP, is a widely used technique that employs protein-antibody interactions to isolate proteins or protein complexes in their native state for studying protein-protein interactions, quaternary structures, or supramolecular complexes. Various modifications of the technique, including chromatin IP, cross-linking IP, and fluorescence IP, are commonly used.
Chromatin Immunoprecipitation
Chromatin immunoprecipitation, also known as ChIP, is used to study protein-DNA or...

Enzyme-Linked Immunosorbent Assay

Enzyme-Linked Immunosorbent Assay

In 1971, Peter Perlman and Eva Engvall developed an Enzyme-linked immunosorbent assay (ELISA or EIA). ELISA differs from western blot in that the assays are conducted in microtiter plates or in vivo rather than on an absorbent membrane.
There are many different types of ELISAs, but they all involve an antibody molecule whose constant region binds an enzyme, leaving the variable region free to bind its specific antigen. Enzyme-substrate reaction allows the antigen to be visualized or quantified.

Immunogold Electron Microscopy

Immunogold Electron Microscopy

Immunoelectron microscopy utilizes immunogold labeling of endogenous proteins with specific antibodies to detect and localize these proteins in cells and tissues. The procedure provides insights into the distribution and quantification of protein under different stimulation conditions offering clues about their functions. Conjugating highly electron-dense gold particles with primary or secondary antibodies allow antigen detection on and within cells, with high resolution and specificity.

Immunofluorescence Microscopy

Immunofluorescence Microscopy

A fluorescence microscope uses fluorescent chromophores called fluorochromes, which can absorb energy from a light source and then emit this energy as visible light. Fluorochromes include naturally fluorescent substances (such as chlorophylls) and fluorescent stains that are added to the specimen to create contrast. Dyes such as Texas red and FITC are examples of fluorochromes. Other examples include the nucleic acid dyes 4’,6’-diamidino-2-phenylindole (DAPI), and acridine orange.
The...

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Related Experiment Video

Updated: Jun 3, 2026

Immunoblot Analysis

Immunoblot Analysis

Published on: June 20, 2008

Immunoblotting.

M Kirschfink¹, P Terness

¹Institute for Immunology, University of Heidelberg, Germany.

Methods in Molecular Medicine

|March 11, 2011

Summary

This summary is machine-generated.

Immunoprecipitation and immunoblotting (Western blotting) identify antigens using antibodies. Immunoblotting is more sensitive for high-molecular-weight proteins, while immunoprecipitation detects more epitope types.

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Immunoblot Analysis

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Published on: June 20, 2008

Immunoprecipitation with an Anti-Epitope Tag Affinity Gel to Study Protein-Protein Interactions

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Quantitative Immunoblotting of Cell Lines as a Standard to Validate Immunofluorescence for Quantifying Biomarker Proteins in Routine Tissue Samples

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Published on: January 7, 2019

Area of Science:

Biochemistry
Immunology
Molecular Biology

Background:

Antibody-based antigen identification is crucial in molecular biology.
Two primary methods, immunoprecipitation and immunoblotting (Western blotting), are commonly employed.

Purpose of the Study:

To compare the advantages and disadvantages of immunoprecipitation and immunoblotting for antigen identification.
To guide the selection of appropriate methods based on experimental needs.

Main Methods:

Immunoprecipitation: Detects conformational and sequential epitopes, efficient for both low and high molecular weight proteins.
Immunoblotting (Western blotting): Immobilizes proteins on membranes for sensitive detection, particularly effective for low molecular weight proteins.

Main Results:

Immunoprecipitation offers broader epitope detection but is less sensitive and convenient than immunoblotting.
Immunoblotting provides high sensitivity (picogram range) but may be less efficient for high molecular weight proteins and can risk epitope destruction.

Conclusions:

The choice between immunoprecipitation and immunoblotting depends on the specific antigen, protein size, and required sensitivity.
For preserving conformational epitopes, antibodies recognizing primary protein structures are recommended when using immunoblotting.