Journal
NANOSCALE
Volume 8, Issue 47, Pages 19644-19653Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6nr07298d
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Funding
- Office of Science (BER), U. S. Department of Energy [DE-SC0008397]
- NCI of Cancer Nanotechnology Excellence [CCNE-TR U54 CA119367, CA151459]
- NIH In vivo Cellular Molecular Imaging Center (ICMIC) [P50 CA114747]
- National Natural Science Foundation of China [81471637]
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Grafting a robust organic shell around inorganic nanoparticles can optimize their colloidal features to dramatically improve their physicochemical properties. Here, we have developed a polymer coating procedure for providing colloidal stability to the nanoparticles and, more importantly, for applying a fast, facile fluorine-18 labeling of iron oxide nanoparticles (IONPs) for positron emission tomography (PET)/magnetic resonance (MR) dual-modality imaging. The structure of the amphiphilic polymer is based on a backbone of polyacrylic acid, conjugated with multiple oleylamines to form a comb-like branched structure. The dense polymer shell provides high colloidal stability to the IONPs against harsh conditions such as high temperature, low pH value, and high ion strength. By incorporating a 1,4,7-triazacyclononane (NOTA) chelator to the comb-like amphiphilic polymer for the chelation of aluminum fluoride ions, we applied a one-step radiolabeling approach for a fast, facile radiofluorination of magnetic nanoparticles. The new strategy can significantly reduce the procedure time and radiation exposure. The PET/MR dual modality imaging was successfully achieved in living subjects by using F-18 labeled magnetic nanoparticles.
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