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Related Experiment Videos

Dissolution from tablets prepared using ethyl cellulose microcapsules.

I Jalsenjak, C F Nicolaidou, J R Nixon

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

    Tablet preparation using sodium phenobarbital microcapsules shows that core:wall ratio and microcapsule size significantly impact tablet strength and drug release rates. These factors are more critical than compression pressure for predictable drug dissolution.

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    Area of Science:

    • Pharmaceutical Technology
    • Materials Science
    • Drug Delivery Systems

    Background:

    • Microencapsulation is a key technique for controlling drug release.
    • Ethyl cellulose microcapsules containing sodium phenobarbital were prepared.
    • Tabletability and dissolution characteristics are crucial for oral dosage forms.

    Purpose of the Study:

    • To investigate the effect of compression pressure, core:wall ratio, and microcapsule size on the properties of sodium phenobarbital tablets.
    • To understand the relationship between microcapsule characteristics and drug release kinetics.

    Main Methods:

    • Tablets were prepared using ethyl cellulose microcapsules with varying core:wall ratios and sizes.
    • Compression pressures ranged from 3.9 to 358.9 MPa.

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  • Tensile strength and drug dissolution rates were measured.

    • Main Results:

    • Tablet tensile strength correlated linearly with core:wall ratio and microcapsule size.
    • Drug dissolution was dependent on core:wall ratio and microcapsule size, largely independent of compression pressure.
    • Tablet matrix integrity was maintained during dissolution.

    Conclusions:

    • Microcapsule properties (core:wall ratio, size) are primary determinants of tablet mechanical strength and drug release.
    • High compression pressures have minimal impact on drug release kinetics from these microcapsules.
    • Optimizing microcapsule characteristics is essential for designing robust tablets with predictable drug release profiles.