Nanotech 2008 Vol. 2
Nanotech 2008 Vol. 2
Nanotechnology 2008: Life Sciences, Medicine & Bio Materials - Technical Proceedings of the 2008 NSTI Nanotechnology Conference and Trade Show, Volume 2

Biomarkers, Nano Particles & Materials Chapter 3

Effect of Ligand Nature on the Kinetics and the Redistribution of Quantum Dots in Mice

Authors: T.J. Daou, L. Li, P. Reiss, I. Texier-Nogues

Affilation: CEA Grenoble, France

Pages: 236 - 239

Keywords: NIR emitting quantum dots, surface coating, bio-distribution

The meeting of nano-materials with biology has produced a new generation of technologies that can profoundly impact biomedical research. The NIR emitting window (650-900 nm) is appealing for in vivo optical imaging because of the low tissue absorption and scattering in this wavelength range. The design of high-quality NIR-emitting quantum dots, with outstanding optical properties in comparison to organic dyes, should therefore lead to novel contrast agents with improved performance (higher fluorescence quantum yields and photo-stability). Quantum dots growth is controlled by the coordination of hydrophobic ligands. Hence, they have to be transferred in water and conveniently coated before their use in vivo. Methods: Several coating strategies are developed in order to: A) prevent quantum dots from flocculating during long-term storage, B) efficiently convert the organic-soluble quantum dots to water-soluble nanoparticles, C) maintain the quantum dot fluorescence quantum yield in biological buffers, and D) maintain the sub-10 nm particle size, necessary for their renal clearance. Results: The speed of first pass extraction of quantum dots towards the reticulo-endothelial system (liver, spleen, bone marrow) depends strongly on the particle size and surface coating (cationic, anionic, neutral, zwitterionic). Conclusion: The surface coating of quantum dots and their hydrodynamic diameter are shown to be the critical parameters in the development of new diagnostic agents.

Effect of Ligand Nature on the Kinetics and the Redistribution of Quantum Dots in Mice

ISBN: 978-1-4200-8504-4
Pages: 808
Hardcopy: $159.95