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• W4308523824 abstract "Atomic layer coating (ALC) is emerging as a particle engineering strategy to inhibit surface crystallization of amorphous solid dispersions (ASDs). In this study, we turn our attention to evaluating drug release behavior from ALC-coated ASDs, and begin to develop a mechanistic framework. Posaconazole/hydroxypropyl methylcellulose acetate succinate was used as a model system at both 25% and 50% drug loadings. ALC-coatings of aluminum oxide up to 40 nm were evaluated for water sorption kinetics and dissolution performance under a range of pH conditions. Scanning electron microscopy with energy dispersive X-ray analysis was used to investigate the microstructure of partially released ASD particles. Coating thickness and defect density (inferred from deposition rates) were found to impact water sorption kinetics. Despite reduced water sorption kinetics, the presence of a coating was not found to impact dissolution rates under conditions where rapid drug release was observed. Under slower releasing conditions, underlying matrix crystallization was reduced by the coating, enabling greater levels of drug release. These results demonstrate that water was able to penetrate through the ALC coating, hydrating the amorphous solid, which can initiate dissolution of drug and/or polymer (depending on pH conditions). Swelling of the ASD substrate subsequently occurs, disrupting and cracking the coating, which serves to facilitate rapid drug release. Water sorption kinetics are highlighted as a potential predictive tool to investigate the coating quality and its potential impact on dissolution performance. This study has implications for formulation design and evaluation of ALC-coated ASD particles." @default.
• W4308523824 created "2022-11-12" @default.
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• W4308523824 date "2022-11-08" @default.
• W4308523824 modified "2023-10-17" @default.
• W4308523824 title "Impact of Aluminum Oxide Nanocoating on Drug Release from Amorphous Solid Dispersion Particles" @default.
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• W4308523824 doi "https://doi.org/10.1021/acs.molpharmaceut.2c00818" @default.
• W4308523824 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/36346665" @default.
• W4308523824 hasPublicationYear "2022" @default.
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