Zwitterionic Ligands Bound to Cdse/Zns Quantum Dots Prevent Adhesion to Mammalian Cells
摘要:
Zwitterionic materials are useful tools in material science and biology as they provide high water solubility while preventing nonspecific interactions. Quantum dots (QDs) functionalized with zwitterionic and quaternary ammonium ligands were synthesized to investigate their interactions with the outer membrane of HeLa cells. Quaternary ammonium functionalized quantum dots adhered strongly to the cell surface while zwitterionic QDs had no cell adhesion. These results demonstrate that future noninteracting nanoparticles based on this design are possible.
Entrapment of Hydrophobic Drugs in Nanoparticle Monolayers with Efficient Release into Cancer Cells
作者:Chae Kyu Kim、Partha Ghosh、Chiara Pagliuca、Zheng-Jiang Zhu、Stefano Menichetti、Vincent M. Rotello
DOI:10.1021/ja808137c
日期:2009.2.4
Goldnanoparticlesfunctionalized with water-soluble zwitterionic ligands form kinetically stable complexes with hydrophobic drugs and dyes. These drugs and dyes are efficiently released into cells, as demonstrated through fluorescence microscopy and cytotoxicity assays. Significantly, there is little or no cellular uptake of particle, making these lowtoxicity particles promising for delivery applications