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Enzyme-Linked Immunosorbent Assay01:33

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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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Electrowetting-based Digital Microfluidics Platform for Automated Enzyme-linked Immunosorbent Assay
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Electrowetting-based Digital Microfluidics Platform for Automated Enzyme-linked Immunosorbent Assay.

Nikolay Dimov1, Martin B McDonnell1, Ian Munro1

  • 1School of Engineering and Computer Science, University of Hertfordshire.

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|March 10, 2020
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Electrowetting-on-dielectric (EWOD) enables rapid, automated antigen detection using Enzyme-Linked Immunosorbent Assay (ELISA) on magnetic beads. This microfluidic approach significantly reduces assay times and reagent volumes for efficient sample processing.

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Area of Science:

  • Microfluidics
  • Biotechnology
  • Surface Science

Background:

  • Electrowetting modifies droplet contact angles via surface charges.
  • Electrowetting-on-dielectric (EWOD) enhances this effect using insulator films.
  • EWOD allows precise droplet manipulation on hydrophobic surfaces.

Purpose of the Study:

  • To develop an automated EWOD protocol for antigen sample processing and detection.
  • To adapt two Enzyme-Linked Immunosorbent Assay (ELISA) variations for EWOD-based detection.
  • To demonstrate rapid and efficient quantification of specific antigens.

Main Methods:

  • Utilized an automated surface actuation platform for EWOD.
  • Performed ELISA on magnetic beads with immobilized primary antibodies.
  • Employed HRP-conjugated antibodies and H2O2/Luminol for antigen quantification.

Main Results:

  • Successfully detected four categories of antigens.
  • Achieved assay completion times between 6 and 10 minutes.
  • Demonstrated the use of minuscule reagent volumes.

Conclusions:

  • EWOD provides an efficient platform for automated microfluidic immunoassays.
  • The developed protocol offers rapid and sensitive antigen detection.
  • This method significantly reduces assay time and reagent consumption.