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Release from or through a wax matrix system. III. Basic properties of release through the wax matrix layer
Yorinobu Yonezawa1, Sumio Ishida, Shinobu Suzuki
1Faculty of Pharmacy, Meijo University, Nagoya, Japan. yzw@ccmfs.meijo-u.ac.jp
Chemical & Pharmaceutical Bulletin
|June 5, 2002
Summary
This study investigated reservoir device matrix tablet release properties. Drug release followed zero-order kinetics in two stages, influenced by matrix composition and layer thickness.
Area of Science:
- Pharmaceutical Sciences
- Materials Science
Background:
- Reservoir device matrix tablets are crucial for controlled drug delivery.
- Understanding release kinetics is essential for optimizing therapeutic efficacy.
Purpose of the Study:
- To examine the release properties of reservoir device matrix tablets.
- To elucidate the relationship between matrix composition and drug release kinetics.
Main Methods:
- Preparation of wax matrix layers using lactose and hydrogenated castor oil.
- Analysis of drug release profiles and kinetic modeling.
- Investigation of lag time and release rate constants.
Main Results:
- Drug release exhibited two distinct stages, including a lag phase and zero-order kinetics.
- Lag time correlated with matrix layer amount and component weight fraction.
- Release rate constants were dependent on matrix thickness and permeability.
Conclusions:
- The study provides insights into the mechanisms governing drug release from wax matrix tablets.
- Matrix layer properties, such as porosity and tortuosity, significantly influence release profiles.
- Findings can inform the design of advanced drug delivery systems.