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Related Experiment Videos

Cholesterol monohydrate dissolution rate studies in aqueous micellar sodium chenodeoxycholate solutions.

S L Gupta, W I Higuchi, N F Ho

    Journal of Pharmaceutical Sciences
    |November 1, 1985
    PubMed
    Summary

    Strong electrolytes significantly impact cholesterol monohydrate dissolution rates by reducing mass transfer resistances. Dissolution sensitivity to Mg2+ was notably higher than Na+, suggesting an electrostatic interfacial barrier.

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    Area of Science:

    • Physical Chemistry
    • Biophysics
    • Materials Science

    Background:

    • Cholesterol monohydrate dissolution is crucial for understanding gallstone formation and drug delivery.
    • The role of bile salts and electrolytes in modulating dissolution kinetics is complex and requires detailed investigation.

    Purpose of the Study:

    • To investigate the influence of sodium chenodeoxycholate (SCC) concentration and added electrolytes on cholesterol monohydrate dissolution rates.
    • To elucidate the mechanism of the interfacial barrier and its electrostatic nature during cholesterol dissolution.

    Main Methods:

    • Dissolution rate measurements of cholesterol monohydrate in varying SCC concentrations with added electrolytes (e.g., Mg2+, Na+).
    • Solubility studies in phosphate buffer.
    • Diffusion coefficient measurements to assess micellar size and behavior.

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  • Analysis of mass transfer resistances and interfacial barrier effects.

    • Main Results:

    • Dissolution rates were significantly affected by electrolyte addition, with mass transfer resistances decreasing at higher concentrations.
    • Mg2+ showed a greater reduction of the interfacial barrier compared to Na+ at equimolar concentrations.
    • Cholesterol monohydrate solubility increased nonlinearly with SCC concentration but was unaffected by electrolytes.
    • Diffusion coefficients indicated stable micellar size, supporting an electrostatic interfacial barrier mechanism.

    Conclusions:

    • The interfacial barrier during cholesterol monohydrate dissolution is electrostatic, involving the interaction of negatively charged micelles with the crystal surface.
    • Electrolyte-induced changes in dissolution are primarily due to modulation of mass transfer and interfacial phenomena.
    • Findings align with previous models involving mixed micelles and support a collision complex transfer mechanism.