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Related Experiment Videos

Composite membrane estradiol implant.

R Bloch, P F Kraicer, H Binder

    Journal of Pharmaceutical Sciences
    |May 1, 1975
    PubMed
    Summary
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    Controlling estrogen release from implants is possible by managing its partial vapor pressure. Solid estrogen exhibits higher permeability than dilute solutions, enabling precise drug delivery rates.

    Area of Science:

    • Materials Science
    • Biomedical Engineering
    • Pharmacology

    Background:

    • Investigating large organic molecule diffusion through polymeric films.
    • Developing biocompatible implants for controlled hormone release.

    Purpose of the Study:

    • To measure diffusion and permeability coefficients of estrogen through polyethylene and silicone films.
    • To explore methods for controlling drug release rates from membrane-based systems.

    Main Methods:

    • Utilized the 'time lag' method for diffusion and permeability measurements.
    • Employed sorption kinetics to determine solubility coefficients.
    • Tested implant systems in rats.

    Main Results:

    • Diffusion and permeability coefficients were measured for estrogen through various polymer films.

    Related Experiment Videos

  • Solubility coefficients were determined, showing good agreement with diffusion data.
  • Estrogen permeability was significantly higher when in solid form versus dilute solution, while diffusion coefficients remained constant.

    • Conclusions:

    • Partial vapor pressure is a critical factor in controlling drug release rates from implants.
    • Managing the partial vapor pressure of encapsulated drugs offers a powerful method for controlled drug delivery.
    • Findings have implications for designing advanced membrane-based drug delivery systems.