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Modeling and comparison of release profiles: Effect of the dissolution method
1Department of Industrial Engineering, University of Salerno, via Giovanni Paolo II 132, 84084 Fisciano, (SA), Italy.
Summary
This study compared pharmaceutical dissolution methods for diclofenac formulations. Different fluid dynamics significantly altered drug release, highlighting the importance of physiologically relevant testing for bioavailability prediction.
Area of Science:
- Pharmaceutical Science
- Drug Delivery
- Biopharmaceutics
Background:
- The US Food and Drug Administration (FDA) encourages in vitro dissolution studies to predict in vivo drug bioavailability.
- Diclofenac, a BCS class II drug, is widely used and requires robust dissolution testing.
- Understanding the impact of dissolution methodology on drug release is crucial for formulation development.
Purpose of the Study:
- To evaluate and compare drug release profiles of immediate and extended-release diclofenac formulations using different dissolution apparatus.
- To investigate the effect of fluid dynamic conditions on drug release from these formulations.
- To assess the performance of an artificial stomach device simulating physiological fluid dynamics.
Main Methods:
- Utilized USP Apparatus II (paddle) and USP Apparatus IV (flow-through cell) for dissolution testing.
- Assessed the influence of mixing conditions (paddle speed, flow rate) on drug release.
- Employed an in vitro artificial stomach device to mimic physiological conditions.
- Applied model-independent and model-dependent approaches (zero-order, first-order, Korsmeyer-Peppas) for data analysis.
Main Results:
- Dissolution profiles varied significantly between USP Apparatus II, USP Apparatus IV, and the artificial stomach.
- Mixing conditions had a limited impact on extended-release formulation profiles in standard apparatus.
- The artificial stomach demonstrated distinct drug release behavior compared to conventional methods.
- Model-dependent analysis identified specific transport phenomena governing drug release for each formulation.
Conclusions:
- Standard dissolution methods (USP Apparatus II and IV) may not fully capture the in vivo performance of diclofenac formulations under physiological conditions.
- An artificial stomach offers a more physiologically relevant in vitro model for predicting drug release.
- Accurate characterization of drug release mechanisms through kinetic modeling is essential for formulation optimization.
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