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Lateral Transport in Anisotropic Membrane during Permeation Study in Diffusion Cell
Patcharawan Nimmansophon1, S Kevin Li2,3
1Division of Pharmaceutical Sciences, James L Winkle College of Pharmacy, University of Cincinnati, Cincinnati, OH, 45267, USA.
Edge effect in membrane transport studies increases flux due to lateral diffusion. This phenomenon, significant in anisotropic membranes, impacts In Vitro Permeation Test (IVPT) data interpretation.
Area of Science:
- Membrane transport phenomena
- Computational modeling in biophysics
Background:
- Mass transport in diffusion cells is complex, involving lateral diffusion.
- Anisotropic diffusion in biological membranes like skin can cause edge effects, increasing flux.
Purpose of the Study:
- To evaluate the impact of edge effect in membrane transport.
- To investigate edge effect under anisotropic diffusion conditions using simulations.
Main Methods:
- Utilized COMSOL Multiphysics for simulations.
- Modeled membrane transport with varying lateral and transverse diffusion coefficients.
Main Results:
- Edge effect caused a 4% to 10% increase in steady-state flux.
- Increased lateral diffusion coefficients and smaller diffusion cell openings amplified the edge effect.
Conclusions:
- Edge effect is evident in anisotropic membranes and small diffusion cells.
- Consideration of edge effect is crucial for accurate In Vitro Permeation Test (IVPT) data interpretation.
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