Particle design for dry powder inhalation via binderless powder coating by pressure swing granulation |
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Authors: | Katsura Takano Masayuki Horio |
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Affiliation: | a Dalton Corporation, 28-6 Saka-machi, Shinjuku, Tokyo 160-0002, Japan b Department of Chemical Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei, Tokyo 184-8588, Japan |
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Abstract: | Novel formulation for dry powder inhalation (DPI) particularly appropriate for very dilute drug concentration was developed based on the pressure swing granulation (PSG) technology. PSG was applied to the granulation of excipient lactose particles and to the coating/dusting of lactose granules with fine model drug particles. Size distribution and granule strength as well as the dispersibility of the drug particles for DPI were found to be successful for practical use. The drug particles dispersed into the respirable aerodynamic size range of 1-7 μm from the E-haler® was 53.9% for 1% coating/dusting (i.e. 1% drug in product granules) and 46.3% for 2%. E-haler® was capable of emitting 89.8% and 83.2% of drug particles charged for cases for 1% and 2% coatings, respectively. |
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Keywords: | Pressure swing granulation Binderless Fluidized bed Powder coating Dry powder inhalation Lactose |
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