Compact Zwitterion-Coated Iron Oxide Nanoparticles for Biological Applications
Author(s)Wei, He; Insin, Numpon; Lee, Jungmin; Han, Hee-Sun; Liu, Wenhao; Bawendi, Moungi G.; Cordero Hernandez, Jose M.; ... Show more Show less
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The potential of superparamagnetic iron oxide nanoparticles (SPIONs) in various biomedical applications, including magnetic resonance imaging (MRI), sensing, and drug delivery, requires that their surface be derivatized to be hydrophilic and biocompatible. We report here the design and synthesis of a compact and water-soluble zwitterionic dopamine sulfonate (ZDS) ligand with strong binding affinity to SPIONs. After ligand exchange, the ZDS-coated SPIONs exhibit small hydrodynamic diameters, and stability with respect to time, pH, and salinity. Furthermore, small ZDS coated SPIONs were found to have a reduced nonspecific affinity (compared to negatively charged SPIONs) toward serum proteins; streptavidin/dye functionalized SPIONs were bioactive and thus specifically targeted biotin receptors.
DepartmentMassachusetts Institute of Technology. Department of Chemistry
American Institute of Physics (AIP)
Wei, He, Numpon Insin, Jungmin Lee, Hee-Sun Han, Jose M. Cordero, Wenhao Liu, and Moungi G. Bawendi. “Compact Zwitterion-Coated Iron Oxide Nanoparticles for Biological Applications.” Nano Letters 12, no. 1 (January 11, 2012): 22-25.
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