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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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Development and Validation of an Ultrasensitive Single Molecule Array Digital Enzyme-linked Immunosorbent Assay for Human Interferon-&#945;
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Label-Free Immunoassay Using Droplet-Based Brewster's Angle Straddle Interferometry.

Fakhraddin Akbari Dourbash1, Alexander A Shestopalov2, Lewis J Rothberg3

  • 1Materials Science Program, University of Rochester, Rochester, New York 14627, United States.

Analytical Chemistry
|March 1, 2021
PubMed
Summary
This summary is machine-generated.

A new label-free optical method detects antigen capture using immobilized antibodies. This sensitive technique shows promise for portable diagnostic applications, offering advantages over existing methods.

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Area of Science:

  • Biophotonics and Biosensing
  • Surface Chemistry and Nanotechnology

Background:

  • Accurate and sensitive detection of antigen-antibody interactions is crucial for diagnostics.
  • Existing methods like Surface Plasmon Resonance (SPR) have limitations in cost, complexity, and material usage.

Purpose of the Study:

  • To develop a simple, label-free optical biosensing technique for antigen capture.
  • To demonstrate the sensitivity and specificity of the method for immunoglobulin detection.
  • To compare the performance of this new method with established techniques like SPR.

Main Methods:

  • Utilized monochromatic reflective interferometry on a silicon-native oxide platform.
  • Optimized incident angle between Brewster angles for enhanced sensitivity.
  • Employed a model sugar protocol to minimize nonspecific binding.

Main Results:

  • Achieved label-free detection of antigen capture by immobilized antibodies (anti-human and anti-rabbit immunoglobulin).
  • Demonstrated sensitivity to immunoglobulin concentrations below 100 nM using only 10 nL of analyte.
  • Successfully detected target antibodies in the presence of a 100-fold excess of bovine serum albumin, indicating high specificity.

Conclusions:

  • The developed interferometry method offers a sensitive and specific label-free approach for antigen detection.
  • The technique is comparable to SPR in sensitivity but offers advantages in simplicity, cost, and material efficiency.
  • The method's robustness and ease of use make it suitable for portable diagnostic applications.