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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.

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A Guide to Modern Quantitative Fluorescent Western Blotting with Troubleshooting Strategies

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Published on: November 20, 2014

A quantitative western blot technique using TMB: Comparison with the conventional technique.

Aristeidis Ntoukas¹, Athanasios Niarchos¹, Aikaterini C Tsika¹

¹Department of Pharmacy, University of Patras, Patras, Greece.

Electrophoresis

|December 19, 2020

Summary

This study introduces a modified Western blot assay for more reliable protein quantification. Cutting blot pieces and using a colorimetric reaction improves accuracy without increasing costs.

Keywords:

Quantification TMB Western blot

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Area of Science:

Molecular Biology
Biochemistry
Analytical Chemistry

Background:

Western blotting is a common method for protein detection and quantification in molecular biology.
Current Western blotting techniques face limitations in achieving complete quantification due to image capture, background noise, and lack of standardized protocols.

Purpose of the Study:

To develop a simple, reliable, and more quantitative assay for protein detection and quantification.
To overcome the limitations of conventional Western blotting for accurate protein measurement.

Main Methods:

A modified Western blotting technique involving cutting small blot pieces containing the protein of interest.
Utilizing a colorimetric reaction with 3,3',5,5'-tetramethylbenzidine (TMB) solution for signal generation.
Stopping the reaction with sulfuric acid (H2SO4) and measuring the signal using a plate reader.

Main Results:

The modified assay demonstrated a linear dependence between the colorimetric signal and the protein quantity.
The technique proved effective for both purified proteins and proteins within cell lysates.
Results showed higher reliability compared to the conventional Western blotting method.

Conclusions:

The proposed modified Western blot assay offers a cost-effective and reliable method for accurate protein quantification.
This approach enhances the quantitative capabilities of Western blotting without requiring specialized equipment beyond a standard plate reader.