Optimization of Amorphization Kinetics during Hot Melt Extrusion by Particle Engineering: An Experimental and Computational StudyClick to copy article linkArticle link copied!
- Dana E. MosesonDana E. MosesonDepartment of Industrial and Physical Pharmacy, College of Pharmacy, Purdue University, West Lafayette, Indiana 47907, United StatesMore by Dana E. Moseson
- Ayse ErenAyse ErenDepartment of Chemical Engineering, College of Engineering, Purdue University, West Lafayette, Indiana 47907, United StatesMore by Ayse Eren
- Kevin J. AltmanKevin J. AltmanDepartment of Industrial and Physical Pharmacy, College of Pharmacy, Purdue University, West Lafayette, Indiana 47907, United StatesMore by Kevin J. Altman
- Isaac D. CorumIsaac D. CorumDepartment of Industrial and Physical Pharmacy, College of Pharmacy, Purdue University, West Lafayette, Indiana 47907, United StatesMore by Isaac D. Corum
- Mingyue LiMingyue LiAnalytical Research and Development, Merck & Co., Inc., Rahway, New Jersey 07065, United StatesMore by Mingyue Li
- Yongchao SuYongchao SuDepartment of Industrial and Physical Pharmacy, College of Pharmacy, Purdue University, West Lafayette, Indiana 47907, United StatesAnalytical Research and Development, Merck & Co., Inc., Rahway, New Jersey 07065, United StatesMore by Yongchao Su
- Zoltan K. NagyZoltan K. NagyDepartment of Chemical Engineering, College of Engineering, Purdue University, West Lafayette, Indiana 47907, United StatesMore by Zoltan K. Nagy
- Lynne S. Taylor*Lynne S. Taylor*Email: [email protected]. Fax: 765-494-6545. Phone: 765-496-6614.Department of Industrial and Physical Pharmacy, College of Pharmacy, Purdue University, West Lafayette, Indiana 47907, United StatesMore by Lynne S. Taylor
Abstract
Hot melt extrusion (HME) to prepare amorphous solid dispersions (ASDs) at temperatures below the drug’s melting point requires the crystalline drug to dissolve into the molten polymer. This requires an understanding of the drug’s solubility in the molten polymer as well as amorphization (crystal dissolution) kinetics. The goal of this study was to identify drug crystal attributes which contribute to rapid amorphization during hot melt extrusion processing to form ASDs. Particle engineering approaches were used to recrystallize bicalutamide with different particle size distributions and defect density. These lots were then used to prepare ASDs by HME to monitor the amorphization kinetics. Particle size had the expected effect on the amorphization rate, and defect density was also observed to accelerate amorphization. A population balance model using dissolution and breakage phenomena was developed to investigate the dynamic evolution of crystal size distribution during a hot melt extrusion process, and parameter estimation was utilized to simulate the experimental HME results. Breakage kinetics were found to dominate the crystal dissolution process, synergistically accelerated by particles with high defect density. The findings have implications for particle engineering of crystals to enable the hot melt extrusion process, as well as improved process modeling through incorporating particle attributes.
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