Please use this identifier to cite or link to this item:
Title: Spherical agglomerates of pure drug nanoparticles for improved pulmonary delivery in dry powder inhalers
Authors: Hu, J.
Dong, Y.
Pastorin, G. 
Ng, W.K. 
Tan, R.B.H. 
Keywords: Dry powder inhalers
Liquid antisolvent precipitation
Pure drug nanoparticles
Sodium cromoglicate
Spray drying
Issue Date: 2013
Citation: Hu, J., Dong, Y., Pastorin, G., Ng, W.K., Tan, R.B.H. (2013). Spherical agglomerates of pure drug nanoparticles for improved pulmonary delivery in dry powder inhalers. Journal of Nanoparticle Research 15 (4) : -. ScholarBank@NUS Repository.
Abstract: The aim of this study was to produce micron-sized spherical agglomerates of pure drug nanoparticles to achieve improved aerosol performance in dry powder inhalers (DPIs). Sodium cromoglicate was chosen as the model drug. Pure drug nanoparticles were prepared through a bottom-up particle formation process, liquid antisolvent precipitation, and then rapidly agglomerated into porous spherical microparticles by immediate (on-line) spray drying. Nonporous spherical drug microparticles with similar geometric size distribution were prepared by conventional spray drying of the aqueous drug solution, which together with the mechanically micronized drug particles were used as the control samples. The three samples were characterized by field emission scanning electron microscopy, laser diffraction, Brunauer-Emmett-Teller analysis, density measurement, powder X-ray diffraction, and in vitro aerosol deposition measurement with a multistage liquid impinger. It was found that drug nanoparticles with a diameter of ~100 nm were precipitated and agglomerated into highly porous spherical microparticles with a volume median diameter (D 50 %) of 2.25 ± 0.08 μm and a specific surface area of 158.63 ± 3.27 m2/g. In vitro aerosol deposition studies showed the fine particle fraction of such spherical agglomerates of drug nanoparticles was increased by more than 50 % in comparison with the control samples, demonstrating significant improvements in aerosol performance. The results of this study indicated the potential of the combined particle engineering process of liquid antisolvent precipitation followed by immediate (on-line) spray drying in the development of novel DPI drug products with improved aerosol performance. © 2013 Springer Science+Business Media Dordrecht.
Source Title: Journal of Nanoparticle Research
ISSN: 13880764
DOI: 10.1007/s11051-013-1560-2
Appears in Collections:Staff Publications

Show full item record
Files in This Item:
There are no files associated with this item.


checked on Mar 17, 2019


checked on Mar 6, 2019

Page view(s)

checked on Dec 28, 2018

Google ScholarTM



Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.