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Single-isotope enzymatic derivative method for measuring catecholamines in human plasma

J Bosak, E Knoll, D Ratge

    Journal of Clinical Chemistry and Clinical Biochemistry. Zeitschrift Fur Klinische Chemie Und Klinische Biochemie
    |July 1, 1980
    PubMed
    Summary

    This study optimized a radioenzymatic assay for plasma catecholamines, achieving reliable quantification. The method demonstrates high accuracy and sensitivity, suitable for clinical plasma sample analysis and stability studies.

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    Area of Science:

    • Biochemistry
    • Analytical Chemistry
    • Clinical Chemistry

    Background:

    • Accurate measurement of plasma catecholamines is crucial for diagnosing and monitoring various medical conditions.
    • Existing methods for catecholamine determination may have limitations in sensitivity, specificity, or practicality.

    Purpose of the Study:

    • To describe and optimize a modified radioenzymatic assay for the precise determination of plasma catecholamines.
    • To establish the reliability and assess the detection limits of the optimized method.
    • To evaluate the stability of plasma catecholamines under different storage conditions.

    Main Methods:

    • Modification and optimization of the da Prada & Zürcher radioenzymatic assay for plasma catecholamines.
    • Optimization focused on substrate and enzyme quantities, and reaction time.

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  • Method validation included determination of blanks, intra-assay variability, recoveries, and detection limits.

    • Main Results:

    • Optimized method demonstrated high reliability with intra-assay coefficients of variation between 3.4% and 8.6%.
    • Recoveries for norepinephrine, epinephrine, and dopamine ranged from 88% to 93%.
    • Detection limits were as low as 3 ng/l for epinephrine, 6 ng/l for dopamine, and 12 ng/l for norepinephrine.

    Conclusions:

    • The optimized radioenzymatic method provides a reliable and sensitive means for quantifying plasma catecholamines.
    • The method is suitable for analyzing clinical plasma samples and assessing catecholamine stability.
    • Plasma samples are stable for short-term storage at room temperature and long-term storage at -27°C.