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Competitive solid-phase enzyme immunoassay for measuring digoxin in serum.

J A Hinds, C F Pincombe, H Morris

    Clinical Chemistry
    |January 1, 1986
    PubMed
    Summary
    This summary is machine-generated.

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    This study presents a new enzyme immunoassay for measuring digoxin in serum. The method uses beta-galactosidase-labeled digoxin and Fab fragments, offering accurate and convenient digoxin quantification.

    Area of Science:

    • Clinical Chemistry
    • Immunology
    • Biochemistry

    Background:

    • Digoxin is a crucial medication for treating heart conditions, necessitating precise therapeutic drug monitoring.
    • Existing digoxin immunoassays may face challenges with serum matrix effects and antibody performance.

    Purpose of the Study:

    • To develop and validate a novel enzyme immunoassay for serum digoxin quantification.
    • To optimize the assay using Fab fragments for improved performance and reduced matrix interference.

    Main Methods:

    • A competitive enzyme immunoassay was developed using beta-galactosidase-labeled digoxin and anti-digoxin Fab fragments.
    • Serum samples were incubated with reagents, followed by Sepharose-bound antibody separation.
    • Unbound enzyme activity in the supernatant was measured to determine digoxin concentration.

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    Main Results:

    • The optimized immunoassay buffer effectively minimized serum matrix effects.
    • Immunoassays utilizing Fab fragments demonstrated superior displacement characteristics compared to intact antibodies.
    • The assay showed excellent correlation (r=0.97) with the EMIT method in 110 clinical specimens.

    Conclusions:

    • This enzyme immunoassay provides a clinically useful and convenient method for serum digoxin measurement.
    • The use of Fab fragments enhances assay performance, making it a viable alternative to existing digoxin immunoassays.