Western blotting technique laboratory analysis

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Western blotting technique laboratory analysis

By Susha Cheriyedath, MSc Introduction Western blot is an invaluable lab technique used to detect Western blotting technique laboratory analysis in a tissue or blood sample. It helps researchers identify specific protein molecules in a complex mixture of proteins.

Since antibodies are used in this technique to mark the target protein, this technique is also known as an immunoblot.

Principle In Western blot, gel electrophoresis is used to separate proteins in a sample based on their molecular weight. The separated proteins are then transferred to a solid support, which is then exposed to antibodies that can bind to the target protein.

This binding is detected using a chemical or radioactive tag. Large protein molecules need to be denatured before electrophoresis to facilitate their movement in the gel. Procedure The technique involves 4 key steps, which are discussed below: Detergents such as sodium dodecyl sulfate are commonly used to denature proteins.

Detergents also offer a negative charge to the protein molecules, which boosts electrophoretic mobility. Separation of proteins The denatured protein sample is loaded onto an electrophoretic gel and an electrical charge is applied.

Protein molecules are separated on the basis of their size and electrical charge. Smaller and highly charged molecules move quickly in the gel and go farther than the bulkier molecules. Transfer to a support membrane The separated proteins is transferred to a sheet of blotting paper made of nitrocellulose.

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The pattern of the protein molecules in the gel remains the same in the blotting paper. Visualizing target protein A primary or monoclonal antibody is added to the blot, which binds to the target protein.

A labeled secondary antibody which binds to the primary antibody is then added, allowing detection of the specific protein. Applications of Western Blotting Some of the important applications of Western blot are listed below: In the detection of circulating antibodies specific to a single protein or several proteins.

In clinical diagnosis — in HIV testing to detect anti-HIV antibody in the serum sample or as confirmatory tests for diseases such as epidermolysis bullosa acquisita or paraneoplastic pemphigus In the analysis of biomarkers such as hormones, growth factors, and cytokines In gene expression studies Disadvantages A few limitations of the Western blot technique are listed below: Western blot is a very delicate and time-consuming process.

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A minute imbalance at any level of the procedure can skew the results of the entire process. The secondary anti-body can sometimes react with a non-intended protein and this can cause labeling of an incorrect protein.

Insufficient transfer time can result in the larger proteins not transferring properly. This can cause erroneous bands or no bands at all.

Western blotting technique laboratory analysis

Well trained technicians are a must for this technique Western blot is semi-quantitative at best. Only an approximate estimation and not a precise measurement of molecular weight of the protein is possible Primary antibody availability is crucial.Western blotting is an important technique used in cell and molecular biology.

By using a western blot, researchers are able to identify specific proteins from a complex mixture of proteins extracted from cells. Western blotting is an important technique used in cell and molecular biology.

By using a western blot, researchers are able to identify specific proteins from a complex mixture of proteins extracted from cells.

The technique uses three elements to accomplish this task: (1) separation by size, (2. Western blot detection involves a number of steps, including selection of the appropriate protein detection method, blotting buffers and reagents, and gel and blot imaging equipment.

The protein blotting workflow involves selection of the appropriate method, apparatus, membrane, buffer, and transfer conditions. Western blotting technique is used for identification of particular protein from the mixture of protein.


In this method labelled antibody against particular protein . Western Blot (WB) is a common method to detect and analyze proteins. It is built on a technique that involves transferring, also known as blotting, proteins separated by electrophoresis from the gel to a membrane where they can be visualized specifically.

Analysis. The last step of a WB is to analyze the results. In a typical qualitative. The Western Blot (WB), or western immunoblot (WB), is a laboratory technique used to detect antibody to specific proteins by means of an indirect immunoassay.

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