Semiconductor Quantum Dots for Bioimaging and Biodiagnostic Applications

Author:

Kairdolf Brad A.1,Smith Andrew M.1,Stokes Todd H.2,Wang May D.2,Young Andrew N.3,Nie Shuming1

Affiliation:

1. Department of Biomedical Engineering, Emory University and Georgia Institute of Technology, Atlanta, Georgia 30322;

2. Departments of Biomedical Engineering and Electrical and Computer Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332

3. Department of Pathology and Laboratory Medicine, Emory University School of Medicine, Atlanta, Georgia 30322

Abstract

Semiconductor quantum dots (QDs) are light-emitting particles on the nanometer scale that have emerged as a new class of fluorescent labels for chemical analysis, molecular imaging, and biomedical diagnostics. Compared with traditional fluorescent probes, QDs have unique optical and electronic properties such as size-tunable light emission, narrow and symmetric emission spectra, and broad absorption spectra that enable the simultaneous excitation of multiple fluorescence colors. QDs are also considerably brighter and more resistant to photobleaching than are organic dyes and fluorescent proteins. These properties are well suited for dynamic imaging at the single-molecule level and for multiplexed biomedical diagnostics at ultrahigh sensitivity. Here, we discuss the fundamental properties of QDs; the development of next-generation QDs; and their applications in bioanalytical chemistry, dynamic cellular imaging, and medical diagnostics. For in vivo and clinical imaging, the potential toxicity of QDs remains a major concern. However, the toxic nature of cadmium-containing QDs is no longer a factor for in vitro diagnostics, so the use of multicolor QDs for molecular diagnostics and pathology is probably the most important and clinically relevant application for semiconductor QDs in the immediate future.

Publisher

Annual Reviews

Subject

Analytical Chemistry

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