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Related Experiment Videos

Dissolution rate behavior of solid cholesterol preparations in bile acid solutions

K M Feld, W I Higuchi

    Journal of Pharmaceutical Sciences
    |July 1, 1981
    PubMed
    Summary

    Different cholesterol preparations exhibit varying dissolution rates due to interfacial transport, not solubility differences. This study developed a method to distinguish these factors, aiding in understanding drug formulation.

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    Area of Science:

    • Physical Chemistry
    • Materials Science
    • Pharmaceutical Sciences

    Background:

    • Different solid preparations of cholesterol monohydrate and anhydrous cholesterol exhibit distinct dissolution rates under identical conditions.
    • Understanding these dissolution differences is crucial for pharmaceutical development and drug delivery systems.

    Purpose of the Study:

    • To develop and apply a method for independently determining the thermodynamic contribution (solubility, Cs) and interfacial kinetic contribution (transport constant, P) to cholesterol dissolution.
    • To investigate the primary source of differing dissolution rates among various cholesterol solid preparations.

    Main Methods:

    • Utilized the rotating-disk dissolution method combined with Levich theory to analyze dissolution data.
    • Determined dynamic solubilities by plotting dissolution rates (J/A) against bulk concentration (Cb) and extrapolating to zero J/A.

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  • Employed a best-fit analysis to independently resolve solubility and interfacial transport parameters.

    • Main Results:

    • The developed method successfully distinguished between thermodynamic and kinetic contributions to dissolution.
    • Differences in dissolution rates among various cholesterol preparations were primarily attributed to variations in the interfacial transport constant (P).
    • Solubility (Cs) variations played a minor role in the observed dissolution rate differences.

    Conclusions:

    • The interfacial transport constant is the dominant factor influencing the dissolution rate variations between different solid cholesterol preparations.
    • The developed method provides a robust approach to dissect dissolution behavior, essential for optimizing solid dosage forms.
    • This research offers valuable insights into the physical chemistry of drug dissolution and formulation design.