In Technology Review, Prachi Patel-Predd reports on a paper submitted to "Small" on functionalizing gold nanoparticles with dendrimers for putative targeted delivery.
Quote: "In a paper published in the July issue of Small, the researchers demonstrated targeting and imaging cancer cells in a laboratory dish with the new gold-dendrimer hybrid nanoparticles. They hooked four or five folic-acid and fluorescent-dye molecules to each of the dendrimer branches. Then they processed the particles to remove any extra surface charge, which can make the otherwise safe polymers toxic."
Full article: http://www.technologyreview.com/Nanotech/18999/