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Related Experiment Videos

Solid-phase immunoassay of digoxin by measuring time-resolved fluorescence.

P Helsingius, I Hemmilä, T Lövgren

    Clinical Chemistry
    |September 1, 1986
    PubMed
    Summary
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    A new time-resolved fluoroimmunoassay accurately measures digoxin levels. This assay offers sensitive and reliable detection of cardiac glycoside concentrations for clinical use.

    Area of Science:

    • Biochemistry
    • Analytical Chemistry
    • Immunology

    Background:

    • Cardiac glycosides, such as digoxin, are crucial for managing heart conditions.
    • Accurate digoxin monitoring is essential to maintain therapeutic efficacy and avoid toxicity.
    • Existing immunoassays, like radioimmunoassay (RIA), have limitations.

    Purpose of the Study:

    • To develop and validate a novel time-resolved fluoroimmunoassay (TRFIA) for quantifying digoxin.
    • To assess the performance characteristics of the TRFIA, including sensitivity, specificity, and correlation with existing methods.

    Main Methods:

    • Utilized a competitive immunoassay format with Eu3+-labeled anti-digoxin antibodies.
    • Employed time-resolved fluorescence detection for enhanced sensitivity and reduced background noise.

    Related Experiment Videos

  • Measured the fluorescence of a beta-diketone chelate formed after antibody-antigen binding.

    • Main Results:

    • The assay demonstrated a digoxin concentration range of 0.25–4.0 ng/mL.
    • Achieved a sensitivity of 0.2 ng/mL, comparable to traditional RIAs.
    • Showed excellent correlation with an in-house RIA (r = 0.97).

    Conclusions:

    • The developed TRFIA is a sensitive and reliable method for digoxin quantification.
    • This assay offers an alternative to RIA with potential advantages in safety and ease of use.
    • The TRFIA is suitable for routine clinical laboratory use in monitoring digoxin therapy.