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The dissolution mechanism in a system undergoing complexation: salicylamide in caffeine solution.

M Donbrow, E Touitou

    The Journal of Pharmacy and Pharmacology
    |September 1, 1977
    PubMed
    Summary

    The dissolution rate of compressed salicylamide discs shifts from interfacial to transport control with increasing caffeine concentration. Higher agitation or temperature delays this dissolution mechanism shift.

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    Area of Science:

    • Pharmaceutical Sciences
    • Physical Chemistry

    Background:

    • Understanding drug dissolution mechanisms is crucial for optimizing pharmaceutical formulations.
    • Salicylamide's dissolution behavior is influenced by environmental factors like temperature and excipient concentration.

    Purpose of the Study:

    • To investigate the dissolution rate of compressed salicylamide discs.
    • To determine the effect of caffeine concentration, temperature, and agitation rate on salicylamide dissolution mechanisms.

    Main Methods:

    • Dissolution rates of compressed salicylamide discs were measured in water and varying caffeine concentrations.
    • Experiments were conducted at temperatures of 15, 25, 37, and 45 degrees Celsius.
    • An apparatus rotating at 48 revolutions per minute or higher was utilized to assess agitation effects.

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    Main Results:

    • Dissolution rate profiles exhibited distinct breaks, indicating a shift in the dissolution mechanism.
    • This shift, from interfacial to transport control, occurred at higher caffeine concentrations when agitation or temperature increased.
    • Dissolution rate dependencies on agitation suggested an intermediate type of dissolution, with Arrhenius plots confirming participation of both interfacial and transport processes.

    Conclusions:

    • Caffeine concentration, temperature, and agitation rate significantly influence salicylamide dissolution mechanisms.
    • The interplay between interfacial and transport control is key to understanding salicylamide's dissolution behavior.
    • These findings provide insights into the physical chemistry of drug dissolution and formulation design.