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Preparation and Characterization of Individual and Multi-drug Loaded Physically Entrapped Polymeric Micelles
Published on: August 28, 2015
Clofibrate microcapsules II: Effect of wall thickness on release characteristics
Journal of Pharmaceutical Sciences
|April 1, 1981
Summary
Microcapsule wall thickness significantly impacts clofibrate release. Thicker walls promote slower, more predictable release, approximating zero-order kinetics for controlled drug delivery applications.
Area of Science:
- Pharmaceutical Sciences
- Materials Science
- Drug Delivery Systems
Background:
- Microencapsulation is a key technique for controlling drug release.
- The physical properties of microcapsules, such as wall thickness, can influence drug release kinetics.
- Understanding these relationships is crucial for designing effective drug delivery systems.
Purpose of the Study:
- To investigate the effect of microcapsule wall thickness on the release characteristics of clofibrate.
- To correlate wall thickness with drug release kinetics and mathematical models.
- To develop a theoretical model explaining the observed release patterns.
Main Methods:
- Microcapsules containing clofibrate were prepared using a gelatin-sodium sulfate system.
- Wall thickness was determined by analyzing the recovered wall material and applying a concentric spheres model.
- In vitro drug release studies were conducted to evaluate release kinetics.
- Data was analyzed using zero-order and square root of time kinetic models.
Main Results:
- Microcapsule wall thickness was directly related to the surface area of the encapsulated droplets.
- Thinner microcapsule walls resulted in faster clofibrate release and deviation from zero-order kinetics, aligning with square root of time models.
- Thicker microcapsule walls led to release patterns approximating zero-order kinetics.
- A linear correlation was established between microcapsule wall thickness and the in vitro t50% (half-release time).
Conclusions:
- Microcapsule wall thickness is a critical determinant of clofibrate release rate and kinetics.
- Controlled drug release, approximating zero-order kinetics, can be achieved by increasing microcapsule wall thickness.
- The developed theoretical model provides a framework for predicting and optimizing drug release from microcapsules based on wall thickness.
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