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Updated: Jun 24, 2026

Formulation of Diblock Polymeric Nanoparticles through Nanoprecipitation Technique
Published on: September 20, 2011
Formulation and stability of itraconazole and odanacatib nanoparticles: governing physical parameters
Varun Kumar1, Lei Wang, Mike Riebe
1Chemical Engineering Department, Princeton University, Princeton New Jersey 08544, USA.
Abstract:
The successful formulation of itraconazole and odanacatib into nanoparticle form with diameters of 145 and 350 nm, respectively, using rapid, block copolymer-directed precipitation is presented. These are the smallest stable nanoparticles that have been reported for these compounds. The difference in size of the nanoparticles for the two compounds is explained by the difference in nucleation rate and its dependence on supersaturation. The conditions for stability after formation are presented: storage at 5 degrees C and removal of residual processing solvent. These requirements are explained in terms of solute solubility and its dependence on both temperature and solvent concentration. The theory of Ostwald ripening provides the framework for understanding the differences in stability observed for the two compounds. The dynamics of the hydrophobic polymer block plays a major role in long-term stability as demonstrated by the behavior of nanoparticles stabilized by poloxamer vs polystyrene-b-polyethylene oxide polymers.
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