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Gold nanoparticles obtained by aqueous digestive ripening: Their application as X-ray contrast agents
Alessandro Silvestri1, Laura Polito2, Giacomo Bellani3
1CNR - ISTM, Nanotechnology Lab., Via G. Fantoli 16/15, 20138 Milan, Italy; Department of Chemistry, University of Milan, Via C. Golgi 19, 20133 Milan, Italy.
Abstract:
A preparative protocol to synthesize large quantities of size-controlled gold nanoparticles (Au NPs), stabilized by CH3O-PEG5000-SH (PEG-SH) in aqueous medium, is reported. The combination of metal vapor synthesis (MVS) technique with digestive ripening process allowed to obtain PEGylated Au NPs with mean core particle size of 3.8nm and hydrodynamic diameters centered at 8.0nm which were effectively used as computed tomography (CT) contrast agents for in vivo experiments on mice. The surface functionalization together with the small hydrodynamic diameters of the engineered Au nanoparticles permitted their efficient renal clearance, still retaining a prolonged blood circulation and a stealth capability.
