Skip to main content
Influence of Permeant Lipophilicity on Permeation Across Human Sclera
Pharmaceutical Science and Research
  • He Wen
  • Jinsong Hao, Marshall University
  • S. Kevin Li
Document Type
Publication Date
Purpose The objectives of this study were to determine the effects of permeant lipophilicity on permeant uptake into and transport across human sclera for transscleral delivery. Methods Model permeants with a wide range of lipophilicities were selected and studied with human sclera. Uptake experiments were carried out to measure permeant partitioning into the sclera. Transport experiments were performed in side-by-side diffusion cells, and the permeability coefficients and transport lag times of the permeants across the sclera were evaluated. Results Permeants with higher lipophilicity showed higher partition coefficients to human sclera, and the apparent transport lag time also increased significantly as the permeant lipophilicity increased. No correlation between the permeability coefficients and lipophilicity of the model permeants was observed in this study with human sclera. A hypothesis on the different findings between the present and previous studies was proposed. Conclusions Permeants with higher lipophilicity exhibited stronger binding to human sclera and would therefore lead to larger permeant partitioning to the sclera and longer transport lag time. The steady-state permeability coefficients of the permeants were not significantly affected by permeant lipophilicity.

The Version of Record is available from the publisher at

Citation Information
Wen, H., Hao, J., & Li, S. K. (2010). Influence of permeant lipophilicity on permeation across human sclera. Pharmaceutical Research, 27(11), 2446-2456.