Exalpha Biologicals, Inc.

Accelerating the Pace of Discovery

Product Highlight

Mouse anti-M13 phage coat protein g8p

Antibodies recognising M13 filamentous phage coat proteins are instrumental in the selection and detection of phages expressing specific antibody fragments or peptide sequences at their surface. The monoclonal antibodies manufactured and supplied by Exalpha react with either the pIII (g3p) or pVIII (g8p) proteins of M13 filamentous bacteriophage. All antibodies are available in a purified format. The antibodies are fully validated and are suitable for a wide range of techniques including:

  • Flow Cytometry
  • Western Blot
  • Immunohistochemistry
  • Immunoprecipitation
For more information, click here for our M13 Bacteriophage information page.


Two more of our excellent products have been published by PubMed:

Potential actionable targets in appendiceal cancer detected by immunohistochemistry, fluorescent in situ hybridization, and mutational analysis
Borazanci, E., et al., J. Gastrointest. Oncol., 8, 164-172 (2017)
Using Exalpha SPARC Antibody (Cat. No. X1867P)

Molecular mechanism underlying the pharmacological interactions of the protein kinase C-β inhibitor enzastaurin and erlotinib in non-small cell lung cancer cells
Steen, N.V., et al., Am. J. Cancer Res., 7, 816-830 (2017)
Using Exalpha's FITC labeled anti PY20 Antibody (Cat. No. X1017)

Ammonium Sulfate Precipitation Protocol


Ammonium sulfate precipitation is one of the most commonly used methods for protein purification from a solution. In solution, proteins form hydrogen bonds with water molecules through their exposed polar and ionic groups. When high concentrations of small, highly charged ions such as ammonium sulfate are added, these groups compete with the proteins to bind to the water molecules. This removes the water molecules from the protein and decreases its solubility, resulting in precipitation. Critical factors that affect the concentration at which a particular protein will precipitate include: the number and position of polar groups, molecular weight of the protein, pH of the solution, and temperature at which the precipitation is performed. The concentration at which antibodies precipitate varies among species; most rabbit antibodies precipitate with a 40% saturated solution, whereas mouse antibodies require 45-50% saturation.


  1. Allow serum or ascitic fluid to thaw, determine total volume, and centrifuge at 3000g for 30 minutes.
  2. Transfer sample to beaker containing a stir bar and place on magnetic stirrer.
  3. While sample is stirring, slowly add saturated ammonium sulfate to bring final concentration to 50% saturation.
    1. Volume of ammonium sulfate needed is equal to volume of sample.
    2. Adding the ammonium sulfate very slowly ensures that local concentration around the site of addition does not exceed the desired salt concentration.
  4. Once total volume of ammonium sulfate is added, move beaker to 4°C for 6 hours or overnight.
  5. Transfer to conical tube and centrifuge the precipitate at 3000g for 30 minutes.
  6. Carefully remove and discard supernatant. Invert conical tube and drain well. For serum or ascites, resuspend pellet in 30%-50% of the starting volume in 1XPBS. For monoclonal antibody tissue culture supernatants, resuspend pellet in 10% of the starting volume in 1X PBS.
  7. Transfer antibody solution to dialysis tubing and dialyze versus three changes of 1XPBS/0.08% Sodium Azide. Be sure to allow enough space for expansion of the antibody solution during dialysis. Normally twice the re-suspended volume is sufficient.
  8. Remove antibody solution from the tubing and centrifuge to remove any remaining debris.
  9. Determine the concentration and store at -80°C for long term storage.