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• W1997016506 abstract "The purpose of this review is to provide an overview of approximate analytical solutions to the general moving boundary diffusion problems encountered during the release of a dispersed drug from matrix systems. Starting from the theoretical basis of the Higuchi equation and its subsequent improvement and refinement, available approximate analytical solutions for the more complicated cases involving heterogeneous matrix, boundary layer effect, finite release medium, surface erosion, and finite dissolution rate are also discussed. Among various modeling approaches, the pseudo-steady state assumption employed in deriving the Higuchi equation and related approximate analytical solutions appears to yield reasonably accurate results in describing the early stage release of a dispersed drug from matrices of different geometries whenever the initial drug loading (A) is much larger than the drug solubility (Cs) in the matrix (or A ≫ Cs). However, when the drug loading is not in great excess of the drug solubility (i.e. low A/Cs values) or when the drug loading approaches the drug solubility (A → Cs) which occurs often with drugs of high aqueous solubility, approximate analytical solutions based on the pseudo-steady state assumption tend to fail, with the Higuchi equation for planar geometry exhibiting a 11.38% error as compared with the exact solution. In contrast, approximate analytical solutions to this problem without making the pseudo-steady state assumption, based on either the double-integration refinement of the heat balance integral method or the direct simplification of available exact analytical solutions, show close agreement with the exact solutions in different geometries, particularly in the case of low A/Cs values or drug loading approaching the drug solubility (A → Cs). However, the double-integration heat balance integral approach is generally more useful in obtaining approximate analytical solutions especially when exact solutions are not available." @default.
• W1997016506 created "2016-06-24" @default.
• W1997016506 creator A5042202477 @default.
• W1997016506 date "2011-10-01" @default.
• W1997016506 modified "2023-10-01" @default.
• W1997016506 title "Modeling of drug release from matrix systems involving moving boundaries: Approximate analytical solutions" @default.
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• W1997016506 doi "https://doi.org/10.1016/j.ijpharm.2011.01.019" @default.
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