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Western Blot / Protein Characterization 

Western blot is often used in research to separate and identify proteins. One simple and common use for Western blotting is to identify whether a particular protein is present or absent in a sample by looking for a band of the correct size on a Western blot . This routine type of Western blot is used to either test for endogenous cellular expression of a target protein, or to examine transfected cell lines to see if expression has been conferred by the introduction of a DNA construct . It is also used with techniques such as protein purification and cellular fractionation to identify which samples have the target protein, and thus is an aid to deciding which samples to combine or discard .

In this technique a mixture of proteins is separated based on molecular weight, and thus by type, through gel electrophoresis. These results are then transferred to a membrane producing a band for each protein. The membrane is then incubated with labels antibodies specific to the protein of interest. The unbound antibody is washed off leaving only the bound antibody to the protein of interest. The bound antibodies are then detected by developing the film. As the antibodies only bind to the protein of interest, only one band should be visible. The thickness of the band corresponds to the amount of protein present; thus doing a standard can indicate the amount of protein present.

Service Details

Requirements: Customer provides the following

  • Purified protein (>50 ug/sample, concentration: >1 mg/ml) OR lysate sample (total protein >500 ug/sample, concentration: >1 mg/ml) 

  • Primary-secondary antibody pair to detect the protein/fragment of interest. Alternatively, customer may purchase the antibodies available from us.

  • Sample expressing the target protein as the positive control.

Service Report

Once the lab work and data analysis are complete, we send you a service report including:

  • Exposure data image for each gel we run (films and membranes) .

  • Complete methodology part .


Time Line

Turnaround time is about 1-3 weeks. Actual times vary based on how many projects we have.

Quotation Request Form


Getting started is easy. Complete this form with the information that we need in order to set up your screening service. 


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