US Patent 7824653 - Water soluble quantum dots

http://www.freepatentsonline.com/7824653.html

This patent from Drexel University teaches manufacturing of CdS and ZnS quantum dots aapted for bioconjugation and a high quality emission spectra. Claim 1 reads:

1. A water soluble quantum dot comprising:

a metal sulfide capped with a material consisting essentially of one or more carboxylated molecules.