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Related Experiment Videos

Dissolution kinetics of phenylbutazone

K G Mooney, M Rodriguez-Gaxiola, M Mintun

    Journal of Pharmaceutical Sciences
    |December 1, 1981
    PubMed
    Summary

    This study shows that while phenylbutazone

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    Area of Science:

    • Pharmaceutical Science
    • Physical Chemistry
    • Chemical Kinetics

    Background:

    • Understanding drug dissolution is crucial for predicting bioavailability.
    • The ionization kinetics of weakly acidic drugs can influence dissolution rates.
    • Phenylbutazone is a model pharmaceutical carbon acid used to study these effects.

    Purpose of the Study:

    • To investigate the impact of noninstantaneous ionization on the dissolution of phenylbutazone.
    • To compare the dissolution behavior of phenylbutazone and its deuterated analog.
    • To determine the role of ionization kinetics in drug dissolution in vitro and in vivo.

    Main Methods:

    • Investigated simultaneous, noninstantaneous, reversible chemical ionization.
    • Studied the dissolution rate versus pH profile for phenylbutazone and its deuterated analog.
    • Analyzed the reaction time for ionization versus residence time in the aqueous diffusion layer.

    Main Results:

    • Phenylbutazone's dissolution profile suggests instantaneous ionization.
    • Noninstantaneous ionization kinetics are unlikely to significantly affect phenylbutazone's dissolution rate.
    • Deuterium substitution (d-phenylbutazone) showed significant deviation from classical behavior due to slowed ionization.

    Conclusions:

    • The ionization kinetics of phenylbutazone do not appear to be a rate-limiting step in its dissolution.
    • The primary isotope effect in d-phenylbutazone highlights the importance of ionization reaction time.
    • These findings have implications for understanding drug dissolution and absorption mechanisms.

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