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Errors in interpretation of data from equilibrium dialysis protein binding experiments.

H L Behm, J G Wagner

    Research Communications in Chemical Pathology and Pharmacology
    |October 1, 1979
    PubMed
    Summary
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    Equilibrium dialysis experiments overestimate free drug concentrations. This study explains the discrepancy and provides methods to accurately estimate initial free drug concentrations and binding parameters.

    Area of Science:

    • Pharmacokinetics
    • Biophysical Chemistry

    Background:

    • Equilibrium dialysis is a common method for determining drug-protein binding.
    • The measured free drug fraction at equilibrium does not directly reflect the initial plasma concentration due to drug loss.

    Purpose of the Study:

    • To clarify the discrepancy between initial and equilibrium drug concentrations in dialysis experiments.
    • To provide a method for accurately estimating initial free drug concentrations and binding parameters.

    Main Methods:

    • Analysis of drug partitioning between plasma and buffer compartments during equilibrium dialysis.
    • Utilizing radiotracer methods to determine the fraction of drug bound at equilibrium.
    • Mathematical estimation of equilibrium and initial drug concentrations.

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    Main Results:

    • Equilibrium drug concentration is lower than the initial concentration due to free drug passage into the buffer.
    • The difference in concentration depends on drug binding extent and experimental conditions.
    • Accurate estimation of initial free drug concentration and binding parameters is possible with known initial total concentration and bound fraction.

    Conclusions:

    • Standard equilibrium dialysis can lead to inaccurate free drug concentration measurements.
    • A method is presented to correct for drug loss and accurately determine binding parameters.
    • This approach is crucial for precise pharmacokinetic and pharmacodynamic assessments.