Special Section on Nanobio-Based Optical Sensing and Imaging

Time-gated cell imaging using long lifetime near-infrared-emitting quantum dots for autofluorescence rejection

[+] Author Affiliations
Sophie Bouccara

Laboratoire de Physique et d’Etude des Matériaux, UMR 8213, ESPCI Paristech, CNRS, UPMC, 10 rue Vauquelin, Paris, France

Alexandra Fragola

Laboratoire de Physique et d’Etude des Matériaux, UMR 8213, ESPCI Paristech, CNRS, UPMC, 10 rue Vauquelin, Paris, France

Emerson Giovanelli

Laboratoire de Physique et d’Etude des Matériaux, UMR 8213, ESPCI Paristech, CNRS, UPMC, 10 rue Vauquelin, Paris, France

Gary Sitbon

Laboratoire de Physique et d’Etude des Matériaux, UMR 8213, ESPCI Paristech, CNRS, UPMC, 10 rue Vauquelin, Paris, France

Nicolas Lequeux

Laboratoire de Physique et d’Etude des Matériaux, UMR 8213, ESPCI Paristech, CNRS, UPMC, 10 rue Vauquelin, Paris, France

Thomas Pons

Laboratoire de Physique et d’Etude des Matériaux, UMR 8213, ESPCI Paristech, CNRS, UPMC, 10 rue Vauquelin, Paris, France

Vincent Loriette

Laboratoire de Physique et d’Etude des Matériaux, UMR 8213, ESPCI Paristech, CNRS, UPMC, 10 rue Vauquelin, Paris, France

J. Biomed. Opt. 19(5), 051208 (Jan 06, 2014). doi:10.1117/1.JBO.19.5.051208
History: Received July 31, 2013; Revised December 5, 2013; Accepted December 5, 2013
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Abstract.  Fluorescence imaging is a promising technique for the detection of individual cell migration. Its sensitivity is, however, limited by a high tissue autofluorescence and a poor visible light penetration depth. In order to solve this problem, the fluorescence signal peak wavelength should lie in an absorption and diffusion free region and should be distinguishable, either spectrally or temporally, from the autofluorescence background. We present, here, the synthesis and characterization of low toxicity Zn–Cu–In–Se/ZnS core/shell quantum dots. Their fluorescence emission wavelength peaks around 800 nm, where the absorption and scattering of tissues are minimal. They are coated with a new ligand, which yields small, stable, and bright individual probes in the live cell cytoplasm, even 48 h after the labeling. Furthermore, these near-infrared-emitting quantum dots have a long fluorescence lifetime component (around 150 ns) compared to autofluorescence (<5ns). Taking the advantage of this property and coupling these probes to a time-gated detection, we demonstrate efficiently the discrimination between the signal and short lifetime fluorescence such as the autofluorescence. This technique is supported by a method we developed, to massively stain cells that preserves the quantum dot stability and brightness for 48 h.

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© 2014 Society of Photo-Optical Instrumentation Engineers

Citation

Sophie Bouccara ; Alexandra Fragola ; Emerson Giovanelli ; Gary Sitbon ; Nicolas Lequeux, et al.
"Time-gated cell imaging using long lifetime near-infrared-emitting quantum dots for autofluorescence rejection", J. Biomed. Opt. 19(5), 051208 (Jan 06, 2014). ; http://dx.doi.org/10.1117/1.JBO.19.5.051208


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