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Published on: August 9, 2022
Short-term changes in drug agglomeration within interactive mixtures following blending.
J G Andreou1, P J Stewart, D A V Morton
1Drug Delivery, Disposition and Dynamics, Monash Institute of Pharmaceutical Science, Monash University, 381 Royal Parade, Parkville, Victoria 3052, Australia.
Drug dissolution rates in interactive mixtures decrease significantly after blending due to increased particle agglomeration. This study highlights the need for better understanding of powder behavior in drug delivery systems.
Area of Science:
- Pharmaceutical Sciences
- Materials Science
- Physical Chemistry
Background:
- Interactive mixtures are crucial in powder-based drug delivery systems.
- Understanding dynamic changes post-processing is vital for drug performance and stability.
Purpose of the Study:
- To investigate short-term dynamic changes in dissolution of micronized drugs in interactive mixtures.
- To quantify changes in agglomeration and dissolution rates after blending.
Main Methods:
- Formulation of nitrazepam and flunitrazepam into lactose-based interactive mixtures with a surfactant.
- Dissolution rate testing and modeling using a multi-exponential equation.
- Particle-sizing studies to assess agglomerate formation.
Main Results:
- Significant decrease in drug dissolution rates observed days after preparation.
- Increased drug agglomeration correlated with decreased dissolution rates.
- First report of short-term dissolution changes post-secondary processing.
Conclusions:
- Short-term agglomeration significantly impacts drug dissolution in interactive mixtures.
- Further research is needed on factors influencing agglomeration (surface charge, moisture, processing).
- Findings have implications for powder-based drug delivery and Quality by Design (QbD) implementation.
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