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Related Concept Videos

Enzyme-Linked Immunosorbent Assay01:33

Enzyme-Linked Immunosorbent Assay

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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...
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A Multiple-Target Simultaneous Detection Method for Immunosorbent Assay and Immunospot Assay.

Jianting Ma1,2, Zuofu Peng3, Lin Ma2

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|June 1, 2022
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New fluorescence-based assays (FOLISA and FOLISPOT) offer highly multiplexed detection with improved sensitivity compared to traditional ELISA and ELISpot methods. These advanced techniques enable simultaneous and sequential analysis of multiple targets, overcoming current limitations in biological sample analysis.

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Area of Science:

  • Biotechnology
  • Immunology
  • Molecular Biology

Background:

  • Enzyme-linked immunosorbent assay (ELISA) and enzyme-linked immunospot (ELISpot) are standard methods for detecting proteins and cell secretion.
  • Current limitations include single-signal detection and insufficient sensitivity for low-concentration samples.

Purpose of the Study:

  • To develop novel fluorescence-based assays, FOLISA and FOLISPOT, for highly multiplexed and sensitive detection.
  • To overcome the limitations of traditional ELISA and ELISpot methods.

Main Methods:

  • Utilized DNA-barcoded antibodies for signal amplification and multiplexing.
  • Employed DNA complementary pairing and modular orthogonal DNA concatemers for enhanced detection.
  • Compared FOLISA with ELISA and FOLISPOT with ELISpot.

Main Results:

  • FOLISA and FOLISPOT demonstrated significantly higher detection sensitivity than traditional methods.
  • FOLISA achieved a detection limit below 0.06 pg/mL, compared to ELISA's ~3 pg/mL.
  • FOLISPOT detected more spots and targets undetectable by ELISpot.
  • Enabled simultaneous and sequential multi-target detection using single or multiple dyes.

Conclusions:

  • FOLISA and FOLISPOT provide effective platforms for rapid, multiplexed antigen/antibody detection.
  • These assays significantly improve detection sensitivity and overcome limitations of existing methods.
  • Presented as general platforms for laboratory and potential clinical applications.