ArticleAAPS PharmSciTech2025
Micro-Flow Imaging: Enhanced Precision in Clarity Assessment of Traditional Chinese Medicine TCM Injections Compared to Light Obscuration and Visual Inspection.
Article in AAPS PharmSciTech, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
This study explored the application of Micro-Flow Imaging (MFI) technology in detecting insoluble particles in traditional Chinese medicine (TCM) injections. Using Danshen Injection (DI) and Guanxinning Injection (GXNI) as examples, we verified the advantages of the MFI method in detecting particle size, morphology, and concentration. Compared to the Light Obscuration (LO) method, MFI captured particles more accurately in the size ranges of ≥ 2 μm, ≥ 5 μm, ≥ 10 μm, and ≥ 25 μm, detecting 5-13 × more particles in the ≥ 10 μm range, especially when detecting semi-transparent non-protein particles. Additionally, the clarity grades assigned by experienced analysts through visual inspection strongly correlated with overall particle concentration (≥ 2 μm), supporting the hypothesis that sub-visible particles (SVPs, particles smaller than 50 μm that are not visible to the naked eye) could reflect the likelihood of visible particles, thus enabling the quantitative characterization of clarity. Morphological analysis showed that endogenous particles in both injections underwent significant changes in shape and intensity during growth, mainly driven by transparent particles, which became increasingly elongated or elliptical in shape. These findings demonstrate that the MFI method offers clear advantages in detecting insoluble particles and quantifying clarity, providing both detailed quantitative data and qualitative information to support particle traceability. Despite challenges in standardization and regulatory acceptance, MFI represents a powerful tool for in-depth research on insoluble particle formation in TCM injections.
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