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Levitated single-droplet drying: case study with itraconazole dried in binary organic solvent mixtures
Eva Wulsten1, Filip Kiekens, Frederic van Dycke
1Division of Pharmaceutics, Friedrich-Alexander-University, Erlangen, Germany.
International Journal of Pharmaceutics
|June 9, 2009
Summary
The polymer (PVP or HPMC) controls drying speed, while itraconazole dictates particle shape in drug/polymer formulations. Solvent systems significantly impact these drying characteristics.
Area of Science:
- Pharmaceutical Sciences
- Materials Science
Background:
- Understanding drug/polymer interactions is crucial for developing effective formulations.
- Solvent systems play a key role in the drying process and final particle characteristics.
Purpose of the Study:
- To investigate the influence of solvent systems on the drying rate and particle morphology of itraconazole/polymer formulations.
- To elucidate the distinct roles of the drug and polymer components during single-droplet drying.
Main Methods:
- Single-droplet drying experiments were conducted on itraconazole/polymer formulations.
- Binary solvent mixtures were utilized to explore varying solubility conditions.
- Drying rates and final particle morphologies were analyzed.
Main Results:
- A dual functionality was observed: the polymer (PVP or HPMC) governed drying rate, while itraconazole influenced particle morphology.
- The formation of a surface skin, observed only with HPMC, affected drying rate but not final particle shape.
- Solubility of components in binary solvent mixtures correlated with observed phenomena.
Conclusions:
- The choice of polymer significantly impacts drying kinetics, whereas the drug determines the resulting particle morphology.
- Surface skin formation is polymer-dependent and affects drying dynamics.
- Tailoring solvent systems and polymer selection allows for control over itraconazole formulation drying characteristics.
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