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Related Experiment Videos

Percutaneous absorption: a single-layer model

K Kubota1, M Sznitowska, H I Maibach

  • 1Department of Dermatology, University of California, School of Medicine, San Francisco 94143-0989.

Journal of Pharmaceutical Sciences
|May 1, 1993
PubMed
Summary
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Fundamental and applied toxicology : official journal of the Society of Toxicology·1992

Betamethasone 17-valerate permeation through human skin was studied using a silicone adhesive. A single-layer model accurately predicted drug half-life in split-thickness skin, but not lag-time.

Area of Science:

  • Dermatology
  • Pharmacokinetics
  • Materials Science

Background:

  • Percutaneous drug delivery is crucial for topical treatments.
  • Understanding drug permeation kinetics through skin layers is essential for formulation development.
  • Betamethasone 17-valerate is a widely used corticosteroid for inflammatory skin conditions.

Purpose of the Study:

  • To investigate the in vitro percutaneous permeation of betamethasone 17-valerate from a silicone adhesive patch.
  • To compare drug permeation kinetics between split-thickness human skin and isolated epidermis.
  • To evaluate the predictive capability of a simple single-layer kinetic model for drug permeation.

Main Methods:

  • In vitro permeation studies using excised human skin (split-thickness and epidermis).

Related Experiment Videos

  • Drug-loaded pressure-sensitive silicone adhesive patches as the vehicle.
  • Analysis of steady-state flux, lag-time, and half-life after vehicle removal.
  • Application of a simple single-layer kinetic model to predict permeation parameters.

    • Main Results:

    • Steady-state flux of betamethasone 17-valerate was similar across split-thickness skin and epidermis.
    • Longer lag-time and half-life were observed for split-thickness skin compared to epidermis.
    • At steady state, 37% of the drug partitioned into the dermis of split-thickness skin.
    • The single-layer model successfully predicted the longer half-life in split-thickness skin (within 23% difference).
    • The simple diffusion model failed to predict lag-time due to high variability.

    Conclusions:

    • A simple single-layer kinetic model can predict drug half-life in percutaneous permeation, accounting for deeper skin layers.
    • The model's predictive power for lag-time was limited, suggesting complex permeation processes.
    • Further refinement of kinetic models may be needed to fully capture percutaneous absorption, especially when post-stratum corneum processes are significant.
    • Physicochemical parameters like diffusion and partition coefficients are not directly represented by the model's kinetic parameters.