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Enzyme immunoassay techniques. An overview.

T Porstmann1, S T Kiessig

  • 1Department of Medical Immunology, Medical School (Charité), Humboldt University Berlin, Germany.

Journal of Immunological Methods
|June 24, 1992
PubMed
Summary
This summary is machine-generated.

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Enzyme immunoassays (EIA) are classified into analyte-observed and reagent-observed types. Reagent-observed assays, utilizing monoclonal antibodies, offer enhanced sensitivity and broader application for macromolecule detection in laboratory settings.

Area of Science:

  • Biochemistry
  • Immunology
  • Analytical Chemistry

Background:

  • Enzyme immunoassays (EIA) encompass diverse techniques, broadly categorized into 'analyte-observed' and 'reagent-observed' assays based on their reaction principles.
  • Reagent-observed assays, particularly those employing monoclonal antibodies, demonstrate superior sensitivity, wider measuring ranges, and reduced susceptibility to interference, making them suitable for macromolecule detection.

Purpose of the Study:

  • To review and classify different enzyme immunoassay (EIA) methodologies.
  • To discuss the advantages and disadvantages of various EIA formats, solid-phase materials, and enzyme labels for optimizing assay performance.
  • To define key parameters for assessing immunoassay quality and establishing internal laboratory controls.

Main Methods:

  • Classification of EIAs into 'analyte-observed' and 'reagent-observed' categories.

Related Experiment Videos

  • Discussion of solid-phase strategies, including adsorption and microparticle use, for heterogeneous EIAs.
  • Review of enzyme markers (horseradish peroxidase, alkaline phosphatase) and labeling techniques (covalent, anti-enzyme antibodies).

    • Main Results:

    • Reagent-observed EIAs with monoclonal antibodies offer enhanced sensitivity and measuring range for macromolecule detection.
    • Microparticles as solid phases enable rapid, one-step heterogeneous assays due to high binding capacity and short diffusion distances.
    • While fluorogenic substrates offer higher sensitivity, the overall assay sensitivity increase is limited; capture EIAs are crucial for precise antibody isotype analysis.

    Conclusions:

    • Heterogeneous EIAs are preferred for macromolecule determination, with careful selection of solid-phase antibodies and optimization of enzyme labeling crucial for performance.
    • Microparticle-based assays significantly reduce assay times, enhancing laboratory efficiency.
    • Defined quality assessment parameters and internal controls are essential for reliable routine immunoassay implementation.