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Modeling the Tablet Disintegration Process Using the Finite Difference Method
Chi So1, Ajit S Narang1, Chen Mao1
1Small Molecule Pharmaceutical Sciences, Genentech, Inc., South San Francisco, CA 94080, United States.
Journal of Pharmaceutical Sciences
|July 7, 2021
Summary
The finite difference method (FDM) models pharmaceutical mass transport, like tablet disintegration, by simulating water uptake and disintegration dynamics. This approach provides detailed spatial-temporal insights, enhancing understanding of drug delivery processes.
Area of Science:
- Pharmaceutical Sciences
- Computational Modeling
- Chemical Engineering
Background:
- Mass transport phenomena are critical in pharmaceutical processes, influencing drug efficacy and delivery.
- Modeling diffusion accurately is essential for understanding complex systems like tablet disintegration.
- Traditional methods often lack detailed spatial-temporal resolution for dynamic processes.
Purpose of the Study:
- To introduce the finite difference method (FDM) for modeling pharmaceutically relevant mass transport.
- To demonstrate FDM's application in simulating tablet disintegration processes.
- To highlight FDM's capability in providing detailed spatial-temporal data.
Main Methods:
- FDM was applied by creating a mesh and discretizing space and time.
- Fick's second law of diffusion was solved numerically at each node.
- Tablet disintegration was simulated by modeling water uptake and a critical water content threshold.
Main Results:
- FDM simulations accurately replicated experimental tablet disintegration behaviors.
- The model captured both disintegration-controlled and water uptake-controlled conditions.
- FDM provided unprecedented spatial-temporal data on water uptake and tablet geometry evolution.
Conclusions:
- FDM is a powerful tool for in-depth analysis of tablet disintegration.
- The method offers unique advantages in visualizing dynamic changes during disintegration.
- FDM has potential for integration into tablet formulation design of experiments (DoE).
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