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Microstructural insight into inhalation powder blends through correlative multi-scale X-ray computed tomography. | LitMetric

Microstructural insight into inhalation powder blends through correlative multi-scale X-ray computed tomography.

Eur J Pharm Biopharm

School of Life and Medical Sciences, University of Hertfordshire, College Lane, Hatfield AL10 9AB, UK. Electronic address:

Published: October 2023

AI Article Synopsis

Article Abstract

Dry powder inhalers (DPI) are important for topical drug delivery to the lungs, but characterising the pre-aerosolised powder microstructure is a key initial step in understanding the post-aerosolised blend performance. In this work, we characterise the pre-aerosolised 3D microstructure of an inhalation blend using correlative multi-scale X-ray Computed Tomography (XCT), identifying lactose and drug-rich phases at multiple length scales on the same sample. The drug-rich phase distribution across the sample is shown to be homogeneous on a bulk scale but heterogeneous on a particulate scale, with individual clusters containing different amounts of drug-rich phase, and different parts of a carrier particle coated with different amounts of drug-rich phase. Simple scalings of the drug-rich phase thickness with carrier particle size are used to derive the drug-proportion to carrier particle size relationship. This work opens new doors to micro-structural assessment of inhalation powders that could be invaluable for bioequivalence assessment of dry powder inhalers.

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http://dx.doi.org/10.1016/j.ejpb.2023.08.016DOI Listing

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