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Related Concept Videos

Enzyme-Linked Immunosorbent Assay01:33

Enzyme-Linked Immunosorbent Assay

In 1971, Peter Perlman and Eva Engvall developed an Enzyme-linked immunosorbent assay (ELISA or EIA). ELISA differs from western blot in that the assays are conducted in microtiter plates or in vivo rather than on an absorbent membrane.
There are many different types of ELISAs, but they all involve an antibody molecule whose constant region binds an enzyme, leaving the variable region free to bind its specific antigen.  Enzyme-substrate reaction allows the antigen to be visualized or quantified.
Immunoprecipitation01:20

Immunoprecipitation

Immunoprecipitation, or IP, is a widely used technique that employs protein-antibody interactions to isolate proteins or protein complexes in their native state for studying protein-protein interactions, quaternary structures, or supramolecular complexes. Various modifications of the technique, including chromatin IP, cross-linking IP, and fluorescence IP, are commonly used.
Chromatin Immunoprecipitation
Chromatin immunoprecipitation, also known as ChIP, is used to study protein-DNA or...
Antibody Actions01:26

Antibody Actions

Antibodies, or immunoglobulins, are critical players in the immune system's arsenal against invading pathogens. Produced by B cells and plasma cells, their primary role is to detect and bind to specific antigens, molecules found on the surface of pathogens like bacteria or viruses. Beyond antigen recognition, antibodies perform several vital functions that contribute to immune defense.
Neutralization
Antibodies can bind to pathogens, preventing them from infecting host cells. This process...

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Related Experiment Video

Updated: Jun 4, 2026

Electrochemiluminescence Assays for Human Islet Autoantibodies
09:15

Electrochemiluminescence Assays for Human Islet Autoantibodies

Published on: March 23, 2018

Antibodies for immunoassays.

D J Newman1

  • 1South West Thames Institute for Renal Research, Surrey, UK.

Methods in Molecular Medicine
|February 22, 2011
PubMed
Summary
This summary is machine-generated.

Immunoassays are analytical techniques that depend on antibody-epitope interactions for detection. This highly sensitive and specific technology quantifies various biological structures across a wide concentration range.

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Last Updated: Jun 4, 2026

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Area of Science:

  • Analytical Chemistry
  • Biochemistry
  • Immunology

Background:

  • Immunoassays are analytical techniques that rely on the specific binding interaction between antibodies (paratope) and antigens (epitope).
  • The name 'immunoassay' itself highlights the indispensable role of antibodies in these detection methods.
  • These interactions generate a detectable signal through various signal transduction mechanisms.

Purpose of the Study:

  • To define the fundamental principles and components of immunoassays.
  • To emphasize the critical role of antibody specificity and affinity in immunoassay performance.
  • To highlight the versatility and sensitivity of immunoassay technology for detecting diverse biomolecules.

Main Methods:

  • Relies on the specific binding interaction between antibody (paratope) and epitope.
  • Utilizes hundreds of different signal transduction mechanisms for detection (e.g., fluorimetry, chemiluminescence, enzyme reactions).
  • Employs quantitative or qualitative analytical approaches.

Main Results:

  • Antibodies provide exquisite sensitivity and specificity for detecting and quantifying epitopic structures.
  • The technology can detect a wide range of targets, including amino-acid derivatives, peptides, proteins, and carbohydrates.
  • Immunoassays are capable of quantifying targets across milli- to zeptomolar concentration ranges.

Conclusions:

  • Immunoassays are fundamentally dependent on antibodies for their analytical capabilities.
  • Antibody-epitope interactions form the basis of this versatile and sensitive detection technology.
  • Immunoassays represent a powerful tool for analyzing diverse biological structures at very low concentrations.