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Calcium Fluoride Nanocrystals: Tracers for In Vivo 19 F Magnetic Resonance Imaging.
Angewandte Chemie 2018 June 19
Inorganic nanocrystals (NCs) have been extensively developed for a variety of uses. The ability to obtain high-resolution NMR signals from the core nuclei of NCs in solution could offer new opportunities in materials sciences and MR imaging. Herein, we demonstrate that small, water-soluble 19 F-ionic NCs can average out homonuclear dipolar interactions, enabling one to obtain high-resolution 19 F NMR signals in solution that reflect the MR properties of F- in the crystal core. Decorating 19 F-NC surfaces with a biocompatible poly(ethylene glycol) coating maintains colloidal stability in water while preserving the NC high-resolution 19 F NMR properties, even after further functionalization. The high content and magnetic equivalence of the fluorides within the NCs enable their use as imaging tracers for in vivo 19 F MRI by facilitating a "hot-spot" display of their distribution.
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