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Related Experiment Videos

Effect of hydrodynamic environment on tablets dissolution rate.

Yan Wu1, D O Kildsig, E S Ghaly

  • 1School of Pharmacy, University of Puerto Rico, San Juan, Puerto Rico 00936-5067, USA.

Pharmaceutical Development and Technology
|March 6, 2004
PubMed
Summary

This study developed a method to test tablet dissolution under controlled flow conditions. Hydrodynamics, dissolution method, and paddle design significantly impact drug release rates and film thickness.

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Area of Science:

  • Pharmaceutical Sciences
  • Physical Chemistry
  • Chemical Engineering

Background:

  • Understanding tablet dissolution is crucial for drug efficacy.
  • External hydrodynamic conditions influence drug release kinetics.
  • Mass transfer and film thickness are key parameters in dissolution.

Purpose of the Study:

  • To develop an experimental method for applying defined flow fields to solid dosage forms.
  • To investigate the rate processes in tablet dissolution.
  • To elucidate the role of hydrodynamics on mass transfer and film thickness.

Main Methods:

  • Two model drugs, Theophylline and Naproxen, were formulated into tablets.
  • Dissolution testing was performed using basket and paddle methods at various rotational speeds (25-100 rpm).

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  • Custom paddles and a tablet holder were designed and utilized.

    • Main Results:

    • Paddle method yielded higher dissolution rates than the basket method.
    • Increased rotational speed enhanced drug release, mass transfer rate, and decreased film thickness.
    • Diffusion was identified as the rate-limiting step, not mass transfer.

    Conclusions:

    • Hydrodynamic conditions, dissolution apparatus type, and paddle design significantly affect dissolution and mass transfer.
    • The developed method allows for controlled study of flow field effects on dissolution.
    • Findings provide insights into optimizing tablet formulations and dissolution testing protocols.