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| Predicate | Object |
|---|---|
| rdf:type | |
| lifeskim:mentions | |
| pubmed:issue |
10
|
| pubmed:dateCreated |
1999-1-22
|
| pubmed:abstractText |
The aerodynamic particle-size distribution for two doses of a Becloforte metered-dose inhaler (MDI) was measured by use of a twin-stage impinger (TSI), the new multi-stage (five-stage) liquid impinger (MSLI) and the Andersen cascade impactor (ACI) (n = 5 for each apparatus). The mean (s.d.) fine-particle doses measured by the three techniques for the Becloforte MDI were 40.3 (1.2), 45.7 (0.5) and 41.8 (0.4)% w/w, respectively; the median mass aerodynamic diameters (MMAD) measured using the MSLI and the ACI were 3.50 and 3.73 microns, respectively. The MSLI fine particle (< 6.8 microns) doses for 2, 5, 10, 20, 30 and 40 doses from Becloforte MDIs (n = 5 for each dose) were 49.7 (0.7), 52.9 (1.2), 45.3 (0.6), 45.5 (0.71), 45.9 (0.7) and 46.4 (0.7)% w/w, respectively. Values obtained using the ACI (< 5.8 microns) were 40.8 (1.0), 41.0 (0.8), 44.4 (0.5), 43.1 (0.4), 42.8 (0.5) and 40.4 (0.4)% w/w (n = 4). MMAD values measured with the MSLI were 3.39, 3.46, 3.75, 3.91, 4.15 and 4.45 microns, respectively; using the ACI they were 3.46, 3.54, 3.61, 3.66, 3.73 and 3.85 microns. The results indicate that the measured aerodynamic particle-size distributions of beclomethasone dipropionate MDIs are affected by the dose dispensed and by the apparatus used for measurement.
|
| pubmed:language |
eng
|
| pubmed:journal | |
| pubmed:citationSubset |
IM
|
| pubmed:chemical | |
| pubmed:status |
MEDLINE
|
| pubmed:month |
Oct
|
| pubmed:issn |
0022-3573
|
| pubmed:author | |
| pubmed:issnType |
Print
|
| pubmed:volume |
50
|
| pubmed:owner |
NLM
|
| pubmed:authorsComplete |
Y
|
| pubmed:pagination |
1081-5
|
| pubmed:dateRevised |
2007-11-15
|
| pubmed:meshHeading |
pubmed-meshheading:9821652-Administration, Inhalation,
pubmed-meshheading:9821652-Beclomethasone,
pubmed-meshheading:9821652-Chromatography, High Pressure Liquid,
pubmed-meshheading:9821652-Evaluation Studies as Topic,
pubmed-meshheading:9821652-Glucocorticoids,
pubmed-meshheading:9821652-Nebulizers and Vaporizers,
pubmed-meshheading:9821652-Particle Size,
pubmed-meshheading:9821652-Receptors, Opioid, kappa
|
| pubmed:year |
1998
|
| pubmed:articleTitle |
The effect of dose on the characterization of aerodynamic particle-size distributions of beclomethasone dipropionate metered-dose inhalers.
|
| pubmed:affiliation |
Postgraduate Studies in Pharmaceutical Chemistry, School of Pharmacy, University of Bradford, UK.
|
| pubmed:publicationType |
Journal Article
|