The objective was to characterize hydroxypropyl methylcellulose acetate succinate (HMPCAS) grades L, M, and H to enhance itraconazole (ITZ) release and permeation from spray dried dispersions (SDDs), and to investigate underpinning molecular ITZ-HPMCAS interactions that differentiated grade performance.
ITZ or its SDDs were subjected to solution stabilization assessment, one-dimensional proton nuclear magnetic resonance (NMR) spectroscopy, saturation transfer difference NMR studies, small volume dissolution, solid state transformation studies, and in vitro dissolution/permeation flux studies.
HPMCAS-L was the best performing grade overall and exhibited greatest ITZ supersaturation concentration, small volume dissolution, and in vitro dissolution/permeation flux. Meanwhile, H grade retarded ITZ precipitation to the greatest extent in solution stabilization studies and exhibited greater hydrophobic interaction with ITZ in NMR studies. However, this apparent advantage of H grade through hydrophobic interactions between drug-polymer appeared to limit overall dissolution/permeation performance of SDD.
In vitro SDD studies and drug-polymer interaction studies provided insight into the performance of HPMCAS grades, as well as the relative contributions of various mechanisms that polymer can promote ITZ absorption from SDD.
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- 1D - 1H NMR:
One dimensional proton nuclear magnetic resonance
Active pharmaceutical ingredient
Amorphous solid dispersions
Differential scanning calorimetry
Hot melt extrusion HME
Hydroxypropyl methylcellulose acetate succinate
Spray dried dispersions
Solid state nuclear magnetic resonance
Saturation transfer difference nuclear magnetic resonance
Glass transition temperature
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Adhikari, A., Polli, J.E. Characterization of Grades of HPMCAS Spray Dried Dispersions of Itraconazole Based on Supersaturation Kinetics and Molecular Interactions Impacting Formulation Performance. Pharm Res 37, 192 (2020). https://doi.org/10.1007/s11095-020-02909-6
- hydroxypropyl methylcellulose acetate succinate
- spray dried dispersions