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- W2000392758 abstract "A physical model of a new matrix-type system is presented where constant drug release can be maintained irrespective of the extent of the tortuosity and receding drug boundary. Theophylline base was dispersed as discrete crystals and fine particles in a matrix formed by the cross-linking of polymeric mixtures consisting of PEG, acrylic resins and ethyl cellulose. DSC analysis was performed to identify any solid state inactivation of the drug. Concave tablets at specified pressures were prepared in order to achieve a wide range of release rates and patterns of release. It was found that the patterns of release could be controlled by the formulation components and the manufacturing procedures. Drug release rates were determined spectrophotometrically under sink conditions and the flux of drug release, dQ/dt, from these matrix-type delivery systems was almost constant over 15 hours, during which time about 85% of the active drug was released. The release rate was devoid of any hydrodynamic boundary effect an..." @default.
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- W2000392758 date "1986-01-01" @default.
- W2000392758 modified "2023-09-23" @default.
- W2000392758 title "Controlled Drug Release from a Compressed Heterogeneous Polymeric Matrix: Kinetics of Release" @default.
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- W2000392758 doi "https://doi.org/10.3109/03639048609042600" @default.
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