Respirable Low-Density Microparticles Formed In Situ from Aerosolized Brittle Matrices
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Inhalation of low-density porous particles enables deep lung delivery with less dependence on device design and patient inspiration. The purpose of this study was to implement Thin Film Freezing (TFF) to investigate a novel approach to dry powder inhalation.
Powders produced by TFF were evaluated for aerodynamic and geometric particle size by cascade impaction and laser light scattering, respectively. Density measurements were conducted according to USP methods and calculated using data from particle size measurements. Excipient inclusion and its effect on moisture sorption was measured by Dynamic Vapor Sorption (DVS).
TFF-produced brittle matrix powders were sheared apart into respirable microparticles using a passive DPI device, producing fine particle fractions (FPF) up to 69% and mass median aerodynamic diameters (MMAD) as low as 2.6 μm. Particles had a mean geometric diameter ranging from 25 μm to 50 μm and mass densities of approximately 0.01 g/cm3. Powders were susceptible to moisture-induced matrix collapse, capillary forces and electrostatic charging; although formulations containing mannitol or no sugar excipient proved to be more robust.
Aerosolized brittle matrices produced by TFF may prove to be a useful platform for highly efficient pulmonary delivery of thermally labile, highly potent, and poorly soluble drugs.
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- Respirable Low-Density Microparticles Formed In Situ from Aerosolized Brittle Matrices
Volume 30, Issue 3 , pp 813-825
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- dry powder inhalation
- low-density particles
- particle engineering
- respirable powder
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- Author Affiliations
- 1. Drug Dynamics Institute, The University of Texas at Austin, 1 University Station, Mail Stop A1915, Austin, Texas, 78712, USA
- 2. College of Pharmacy, The University of Texas at Austin, 1 University Station, Mail Stop A1920, Austin, Texas, 78712, USA
- 3. Department of Chemical Engineering, The University of Texas at Austin, 1 University Station, Mail Stop C0400, Austin, Texas, 78712, USA