What is a Suitable Dissolution Method for Drug Nanoparticles?
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Many existing and new drugs fail to be fully utilized because of their limited bioavailability due to poor solubility in aqueous media. Given the emerging importance of using nanoparticles as a promising way to enhance the dissolution rate of these drugs, a method must be developed to adequately reflect the rate-change due to size reduction. At present, there is little published work examining the suitability of different dissolution apparatus for nanoparticles.
Four commonly-used methods (the paddle, rotating basket and flow-through cell from the US Pharmacopia, and a dialysis method) were employed to measure the dissolution rates of cefuroxime axetil as a model for nanodrug particles.
Experimental rate ratios between the nanoparticles and their unprocessed form were 6.95, 1.57 and 1.00 for the flow-through, basket and paddle apparatus respectively. In comparison, the model-predicted value was 7.97. Dissolution via dialysis was rate-limited by the membrane.
The data showed the flow-through cell to be unequivocally the most robust dissolution method for the nanoparticulate system. Furthermore, the dissolution profiles conform closely to the classic Noyes–Whitney model, indicating that the increase in dissolution rate as particles become smaller results from the increase in surface area and solubility of the nanoparticles.
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- What is a Suitable Dissolution Method for Drug Nanoparticles?
Volume 25, Issue 7 , pp 1696-1701
- Cover Date
- Print ISSN
- Online ISSN
- Springer US
- Additional Links
- cefuroxime axetil
- drug nanoparticles
- Noyes–Whitney equation
- poorly water-soluble drug
- powder dissolution apparatus
- Industry Sectors
- Author Affiliations
- 1. Advanced Drug Delivery Group, Faculty of Pharmacy, A15, The University of Sydney, Sydney, NSW, 2006, Australia
- 3. Nanomaterials Technology Pty. Ltd., 28 Ayer Rajah Crescent, #03-03, Singapore, 139959, Singapore
- 2. Department of Chemical Engineering, University of Missouri-Rolla, Rolla, Missouri, 65409, USA