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• W2157951331 abstract "Objectives. The purpose of these studies was to understand the influence of cosolvent and surfactant contributions to particle size distributions emitted from solution metered dose inhalers (pMDIs) based on the propellant HFA 227. Methods. Two sets of formulations were prepared: (a) pMDIs-HFA 227 containing cosolvent (5–15% w/w ethanol) with constant surfactant (pluronic) concentration and (b) pMDIs-HFA 227 containing surfactant (0–5.45% w/w pluronic) with constant cosolvent concentration. Particle size distributions emitted from these pMDIs were analyzed using aerodynamic characterization (inertial impaction) and laser diffraction methods. Results . Both cosolvent and surfactant concentrations were positively correlated with median particle sizes; that is, drug particle size increased with increasing ethanol and pluronic concentrations. However, evaluation of particle size distributions showed that cosolvent caused reduction in the fine particle mode magnitude while the surfactant caused a shift in the mode position. These findings highlight the different mechanisms by which these components influence droplet formation and demonstrate the ability to utilize the different effects in formulations of pMDI-HFA 227 for independently modulating particle sizes in the respirable region. Conclusion . Potentially, the formulation design window generated using these excipients in combination could be used to match the particle size output of reformulated products to preexisting pMDI products." @default.
• W2157951331 created "2016-06-24" @default.
• W2157951331 creator A5023590664 @default.
• W2157951331 creator A5058060165 @default.
• W2157951331 date "2013-01-01" @default.
• W2157951331 modified "2023-09-28" @default.
• W2157951331 title "Tuning Aerosol Particle Size Distribution of Metered Dose Inhalers Using Cosolvents and Surfactants" @default.
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• W2157951331 doi "https://doi.org/10.1155/2013/574310" @default.
• W2157951331 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3741898" @default.
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• W2157951331 hasPublicationYear "2013" @default.
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