Counter immunoelectrophoresis (CIE): Principle, Procedure and Uses 4.6/5 (5)

 The principle of Counter Immunoelectrophoresis method is that at pH 8.4 the immunoglobulins will migrate to the negative end of a capillary system if an electric field has been applied to the capillary system. In the same capillary system, many antigens will migrate towards the positive end at that pH. As the antibody and antigen move towards each other in an electric field, they will soon meet in optimal proportion and visible precipitate is formed.

Salient features:

  1. Modification of the Ouchterlony method.
  2. Unknown bacterial antigen and a known specific antibody move towards each other in an electrical field
  3. Most bacterial antigen are negatively charged  (eg. Capsular polysaccharide) in a slightly alkaline environment.
  4. When Ag and Ab meet in optimal proportions, a line of precipitation appear within the agar matrix
  5. The entire procedure takes about One hour.
  6. Any antigen for which antisera is available can be tested by CIE Sensivity less than that of particle agglutination (0.01-0.05 mg/ml) of antigen.

Uses of Counter Immunoelectrophoresis

Counter Immunoelectrophoresis is used to detect presence of capsular antigens in CSF of

  • H. influenzae
  • N. meningitidis
  • S. Pneumoniae etc

Demerits of the test:

  1. CIE is  more expensive than agglutination based tests.
    • Initial capital outlay for the apparatus
    • Need of large quantity of Ag and Ab

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3 thoughts on “Counter immunoelectrophoresis (CIE): Principle, Procedure and Uses

  1. Anahalu Ikenna C

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    I am a PhD Student of Medical Microbiology in Nnamdi Azikiwe University. Awka, Anambra State, Nigeria.
    Am appreciative of this your post on electrophoresis. I believe I will still enjoy further interactions with you. Thanks

  2. I am a Bachelor student of Medical Degree in The Quest International University, Perak, Malaysia.
    I am much appreciative and thankful of your article as your article has helped me in microbology.


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