Immunoassay - ELISA

04:52 EDT 22nd August 2019 | BioPortfolio

Immunoassays are quick and accurate tests to detect specific molecules. Immunoassays rely on an antibody to bind to the specific structure of a molecule. Antibodies are proteins generated by animals in response to the invasion of a foreign molecule (antigen) into the body. Antibodies are found in blood and tissue fluids and will bind to the antigen whenever it is encountered. Because antibodies are developed to the specific three-dimensional structure of an antigen, or analyte, they are highly specific and will bind only to that structure. Once purified from the blood, monoclonal and polyclonal antibodies are ideal assay reagents to detect and monitor specific target molecules with limited interferences from other substances.

There are four main typical ELISA formats:

  • monoclonal-polyclonal sandwich assays
  • competitive inhibition assays
  • antigen-down immunoassays
  • rapid assays
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