A Review of Methods for Evaluating Particle Stability in Suspension Based Pressurized Metered Dose Inhalers.

Abstract:

:Advances in particle engineering techniques, such as spray drying, freeze drying and supercritical fluid precipitation, have greatly enhanced the ability to control the structure, morphology, and solid state phase of inhalable sized particles (1 - 5 µm) for formulation in pressurized metered dose inhalers (pMDI). To optimize the properties of these engineered particles for formulation in hydrofluoroalkane propellants (HFA 134a / 227) it is necessary to measure both bulk and individual particle properties before, after, and during formulation. This review examines established and recently developed methods for evaluating a variety of particle properties including but not limited to size, surface and internal morphology, chemical composition, and solid state phase. Novel methods for evaluating particle physical and chemical stability directly in propellant or similar environments are also discussed.

journal_name

Curr Pharm Des

authors

D'Sa D,Chan HK

doi

10.2174/1381612821666150820110153

subject

Has Abstract

pub_date

2015-01-01 00:00:00

pages

3955-65

issue

27

eissn

1381-6128

issn

1873-4286

pii

CPD-EPUB-69691

journal_volume

21

pub_type

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