Authors: Susan Hoe Paul M Young HakKim Chan Daniela Traini
Publish Date: 2008/10/31
Volume: 26, Issue: 2, Pages: 431-437
Abstract
Flixotide® fluticasone propionate Ventolin® salbutamol sulphate and QVAR® beclomethasone dipropionate were used as model pMDIs in this study At an airflow rate of 30 l/min five individual actuations of each pMDI were introduced into the electrical lowpressure impactor ELPI Next Generation Impactor NGI and the eNGI Charge profiles for each actuation were measured by the ELPI and eNGI while mass profiles were recorded by the all three impactorsThe difference in estimated mass median aerodynamic diameters and geometric standard deviations for all pMDIs using the NGI and eNGI were not found to be statistically significant p 005 The mean charge profiles from the ELPI and eNGI overlap well between 054 and 661 μm Flixotide® and Ventolin® and between 0615 and 1172 μm QVAR® where the majority of the impacted doses were collected Conclusion For the analysis of pMDIs the eNGI is comparable to the NGI in measuring particle size distribution while still being comparable to the ELPI in measuring charge distribution
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