alexa Improved input parameters for diffusion models of skin absorption.
Mathematics

Mathematics

Journal of Generalized Lie Theory and Applications

Author(s): Hansen S, Lehr CM, Schaefer UF

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Abstract To use a diffusion model for predicting skin absorption requires accurate estimates of input parameters on model geometry, affinity and transport characteristics. This review summarizes methods to obtain input parameters for diffusion models of skin absorption focusing on partition and diffusion coefficients. These include experimental methods, extrapolation approaches, and correlations that relate partition and diffusion coefficients to tabulated physico-chemical solute properties. Exhaustive databases on lipid-water and corneocyte protein-water partition coefficients are presented and analyzed to provide improved approximations to estimate lipid-water and corneocyte protein-water partition coefficients. The most commonly used estimates of lipid and corneocyte diffusion coefficients are also reviewed. In order to improve modeling of skin absorption in the future diffusion models should include the vertical stratum corneum heterogeneity, slow equilibration processes, the absorption from complex non-aqueous formulations, and an improved representation of dermal absorption processes. This will require input parameters for which no suitable estimates are yet available. Copyright © 2012 Elsevier B.V. All rights reserved. This article was published in Adv Drug Deliv Rev and referenced in Journal of Generalized Lie Theory and Applications

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