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Related Experiment Videos

Plasma protein binding of warfarin: methodological considerations.

D Mungall, Y Y Wong, R L Talbert

    Journal of Pharmaceutical Sciences
    |July 1, 1984
    PubMed
    Summary

    Radiochemical impurities can overestimate drug binding. Using pure [14C]warfarin with HPLC revealed lower free warfarin percentages than nonspecific methods, highlighting the importance of purity in protein binding assays.

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    Area of Science:

    • Pharmacology
    • Analytical Chemistry
    • Biochemistry

    Background:

    • Highly protein-bound drugs are susceptible to inaccurate binding measurements due to radiochemical impurities.
    • Accurate determination of drug-protein binding is crucial for understanding drug efficacy and safety.

    Purpose of the Study:

    • To compare protein binding of warfarin using ultrafiltration and equilibrium dialysis with radiochemically pure [14C]warfarin.
    • To evaluate the impact of radiochemical purity on drug binding assay results.
    • To compare nonspecific radioisotopic and specific HPLC techniques for measuring warfarin-free fraction.

    Main Methods:

    • Ultrafiltration and equilibrium dialysis performed at 37°C and pH 7.45 on patient plasma.
    • Measurement of warfarin binding using both a nonspecific radioisotopic technique and a specific High-Performance Liquid Chromatography (HPLC) technique.

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  • Analysis of plasma from patients receiving chronic warfarin therapy.

    • Main Results:

    • Nonspecific methods overestimated the percentage of free warfarin compared to HPLC.
    • HPLC revealed significantly lower free warfarin percentages (p < 0.05) with both ultrafiltration and equilibrium dialysis.
    • Ultrafiltration yielded a higher percentage of free warfarin than equilibrium dialysis, but both methods showed similar patient-to-patient variability.

    Conclusions:

    • Radiochemical impurities can lead to significant overestimation of the percentage of free warfarin.
    • Specific HPLC methods are more accurate for determining warfarin-free fraction in the presence of potential impurities.
    • Ensuring radiochemical purity is critical for reliable drug-protein binding studies.