Purification of IgG Using Caprylic Acid

  • Mark Page
  • Robin Thorpe
Part of the Springer Protocols Handbooks book series (SPH)


Caprylic (octanoic) acid can be used to purify mammalian IgG from serum, plasma, ascites fluid, and hybridoma culture supernatant by precipitation of non-IgG protein (1) (see Note 1). Other methods have been described where caprylic acid has been used to precipitate immunoglobulin depending on the concentration used. The concentration of caprylic acid required to purify IgG varies according to species (see Section 3., step 2). For MAb, it is usually necessary to determine experimentally the quantity required to produce the desired purity/yield. Generally, the product is of low to intermediate purity but this will depend on the starting material. Caprylic acid purified IgG preparations can be used for most immunochemical procedures, such as coating plates for antigen capture assays and preparation of immunoaffinity columns, but would not be suitable for conjugation with radioisotopes, enzymes, and biotin where contaminating proteins will reduce the specific activity.


Acetic Acid High Purity Sodium Acetate Ammonium Sulfate Free Acid 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


  1. 1.
    Steinbuch, M. and Audran, R. (1969) The isolation of IgG from mammalian sera with the aid of caprylic acid. Arch. Biochem. Biophys. 134, 279–284.PubMedCrossRefGoogle Scholar

Copyright information

© Humana Press Inc., Totowa, NJ 1996

Authors and Affiliations

  • Mark Page
    • 1
  • Robin Thorpe
    • 2
  1. 1.MEDEVA, Vaccine Research Unit, Department of BiochemistryImperial College of Science, Technology, and MedicineLondonUK
  2. 2.National Institute for Biological Standards and ControlPotters BarUK

Personalised recommendations