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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.

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Generation of Two-color Antigen Microarrays for the Simultaneous Detection of IgG and IgM Autoantibodies
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An automated multiplex specific IgE assay system using a photoimmobilized microarray.

Yoshihiro Ito1, Nozomi Moritsugu, Takahisa Matsue

  • 1Nano Medical Engineering Laboratory, RIKEN Advanced Science Institute, 2-1 Hirosawa, Wako-shi, Saitama, 351-0198, Japan. y-ito@riken.jp

Journal of Biotechnology
|August 28, 2012
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Summary

A new automated system uses photoimmobilized allergens for rapid, specific IgE testing. This diagnostic tool efficiently screens for allergies using minimal patient serum in just 20 minutes.

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Area of Science:

  • Biotechnology
  • Immunology
  • Analytical Chemistry

Background:

  • Developing efficient methods for allergen-specific immunoglobulin E (IgE) detection is crucial for allergy diagnostics.
  • Traditional methods can be time-consuming and require larger sample volumes.
  • Photoimmobilization offers a versatile approach for attaching biomolecules to surfaces without specific functional groups.

Purpose of the Study:

  • To develop and validate an automated microarray diagnostic system for specific IgE detection.
  • To utilize photoimmobilization for stable and efficient allergen attachment to microarray plates.
  • To assess the system's performance in terms of speed, sample volume, and accuracy compared to conventional methods.

Main Methods:

  • Development of a microarray plate using a photoreactive polymer and photo-induced radical cross-linking for allergen immobilization.
  • Design of an automated machine for performing the specific IgE assay.
  • Detection of IgE binding using a peroxidase-conjugated anti-IgE antibody and chemiluminescence imaging with a CCD camera.

Main Results:

  • Stable covalent immobilization of various allergens was achieved using the photoimmobilization technique.
  • The automated system successfully detected allergen-specific IgE in patient serum samples.
  • The assay required only 10 μL of serum and was completed within 20 minutes for six different allergens.
  • Results showed comparability with conventional specific IgE testing methods.

Conclusions:

  • The developed automated microarray system provides a rapid and efficient method for screening allergen-specific IgE.
  • Photoimmobilization is a robust technique for preparing diagnostic microarrays.
  • This system has the potential to significantly improve the speed and efficiency of allergy diagnostics.