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Dissolution profiles for finely divided drug suspensions.

J W Mauger, S A Howard, K Amin

    Journal of Pharmaceutical Sciences
    |February 1, 1983
    PubMed
    Summary
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    Particle size significantly impacts prednisolone acetate dissolution rates. Smaller particles dissolve faster, following the Higuchi-Hiestand model, with a higher dissolution rate constant than predicted.

    Area of Science:

    • Pharmaceutics
    • Materials Science

    Background:

    • Micronized prednisolone acetate particle size is critical for drug dissolution.
    • Understanding particle size-dissolution relationships aids formulation development.

    Purpose of the Study:

    • To investigate the effect of particle size fractionation on prednisolone acetate dissolution.
    • To evaluate the applicability of the Higuchi-Hiestand model to dissolution profiles.

    Main Methods:

    • Centrifugal elutriation used to separate micronized prednisolone acetate into narrow particle size fractions.
    • Dissolution studies conducted under sink conditions using a continuous circulation system and spectrophotometer.
    • Higuchi-Hiestand model applied to analyze dissolution data.

    Main Results:

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    • Four distinct particle size fractions of prednisolone acetate were obtained.
    • Dissolution rates were particle-size dependent, with smaller particles dissolving faster.
    • Dissolution profiles for small particle fractions were well-described by the Higuchi-Hiestand model.
    • Observed dissolution rate constants (K) were approximately 3.5 times greater than theoretically predicted values.

    Conclusions:

    • Particle size engineering is a key factor in controlling prednisolone acetate dissolution.
    • The Higuchi-Hiestand model effectively describes dissolution for small particle fractions.
    • Experimental dissolution rates suggest enhanced drug release from micronized particles.