Spray dried inhalable ivacaftor co-amorphous microparticle formulations with leucine achieved enhanced in vitro
Jian Guan1, Huiya Yuan2, Shihui Yu3
1School of Pharmacy, Shenyang Pharmaceutical University, Shenyang 110016, China; Department of Industrial and Physical Pharmacy, College of Pharmacy, Purdue University, West Lafayette, IN 47907, United States.
Abstract:
The present study aimed to develop inhalable powder formulations with both dissolution enhancement and superior aerodynamic properties for potential pulmonary delivery of a poorly water-soluble drug, ivacaftor (IVA). The IVA-leucine (LEU) microparticle formulations were produced by spray drying and the physicochemical, aerosolization and cytotoxicity properties were characterized. Co-amorphous microparticle formulation was formed at the IVA: LEU 3:1 M ratio with hydrogen bond interactions as indicated by Fourier transform infrared spectroscopy (FTIR) results. Dissolution rate of the co-spray dried formulations was significantly improved as compared with the IVA alone or physical mixtures. The co-spray dried formulations exhibited > 80% fine particle fraction (FPF) and > 95% emitted dose percentage (ED) values respectively, with superior physical and aerosolization stability under 40℃ at 75% RH for 30 days. The laser scanning confocal microscopy results demonstrated that more IVA was uptake by Calu-3 cell lines for the co-spray dried formulation. In summary, our results demonstrated that co-spray drying IVA with LEU could achieve enhanced in vitro release and superior aerodynamic properties for pulmonary delivery of IVA.
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