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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.
|Number of pages||11|
|Journal||European Journal of Pharmaceutics and Biopharmaceutics|
|Early online date||30 Aug 2023|
|Publication status||Published - 1 Oct 2023|
- X-ray Computed Tomography
- Microstructural equivalence
- Powder characterisation
- Correlative Tomography
- Correlative tomography
- X-ray computed tomography
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INFORM 2020 - Molecules to Manufacture: Processing and Formulation Engineering of Inhalable Nanoaggregates and Microparticles
1/10/16 → 31/01/21