Compact Zwitterion-Coated Iron Oxide Nanoparticles for Biological Applications

• Main Authors: Wei, He (Contributor), Insin, Numpon (Contributor), Lee, Jungmin (Contributor), Han, Hee-Sun (Contributor), Liu, Wenhao (Contributor), Bawendi, Moungi G. (Contributor), Cordero Hernandez, Jose M. (Contributor)
• Other Authors: Massachusetts Institute of Technology. Department of Chemistry (Contributor)
• Format: Article
• Language: English
• Published: American Institute of Physics (AIP), 2013-11-04T19:36:41Z.
• Subjects: Article
• Online Access: Get fulltext

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.
National Institutes of Health (U.S.) (MIT-Harvard Center for Cancer Nanotechnology Excellence Grant 1U54-CA126642)
National Cancer Institute (U.S.) (Grant R01-CA126642)
Massachusetts Institute of Technology. Institute for Soldier Nanotechnologies (W911NF-07-D-0004)
National Science Foundation (U.S.) (Collaborative Research in Chemistry Program CHE-0714189)