Non-Destructive Quality Assessment of Freeze Dried Pharmaceuticals by µCT

Freeze drying is a widely used technique for preserving pharmaceuticals, particularly for biologics and temperature-sensitive compounds. While the process effectively stabilizes drug formulations for long-term storage, ensuring the quality and structural integrity of freeze dried products remains a significant challenge. Various defects, such as shrinkage, collapse, pore structure irregularities, and contamination, can compromise product stability, reconstitution behavior, and overall efficacy. Conventional quality control methods, such as visual inspection and moisture content analysis, are often limited in their ability to detect internal defects or subtle structural variations. This dissertation investigates the application of X-ray computed tomography (CT) as a non-destructive analytical tool for the comprehensive assessment of freeze dried pharmaceuticals. The study focuses on three main aspects: (1) the characterization of product morphology and the detection of structural defects, (2) the identification of foreign particles embedded within the freeze dried cake, and (3) the evaluation of container closure integrity (CCI) to ensure sterility and protection from environmental factors. µCT imaging enables detailed three-dimensional visualization of internal structures, allowing for the detection of both macroscopic and microscopic defects that may not be visible through traditional inspection techniques. Additionally, CT analysis provides insights into the impact of different freezing and drying conditions on the final product structure. The research further explores the feasibility of CT for detecting particulate contamination, a critical aspect of pharmaceutical quality control, as well as its potential for evaluating the sealing integrity of vials, which is crucial for maintaining product sterility and stability. The results of this study demonstrate that CT technology is a valuable tool for improving quality assurance in freeze drying. By offering a non-invasive and quantitative approach to defect detection, structural analysis, and packaging evaluation, CT has the potential to enhance the safety, reliability, and efficiency of freeze-dried pharmaceutical manufacturing. The findings highlight the benefits of implementing CT as part of an advanced quality control strategy, paving the way for its broader adoption in pharmaceutical development and production