Specific turn-on near infrared fluorescence from non-fluorescent gold nanoclusters bearing sulfhydryl oligopeptides

Specific turn-on near infrared fluorescence from non-fluorescent gold nanoclusters bearing... Colloids and Surfaces A 538 (2018) 14–22 Contents lists available at ScienceDirect Colloids and Surfaces A journal homepage: www.elsevier.com/locate/colsurfa Research Paper Specific turn-on near infrared fluorescence from non-fluorescent gold nanoclusters bearing sulfhydryl oligopeptides Nobuo Uehara , Natsumi Sonoda, Chikara Haneishi Graduate School of Engineering, Utsunomiya University, 7-1-2 Yoto, Utsunomiya, Tochigi, 321-8585, Japan GR APHICAL A BSTRACT ARTICLE I NFO ABSTRACT Keywords: We describe the development of near-infrared (NIR) fluorescence from non-fluorescent gold nanoclusters as a Gold result of the reaction with sulfhydryl oligopeptides. Non-fluorescent gold nanoclusters with a diameter of about Nanoclusters 2 nm were synthesized by reducing HAuCl with NaBH in the presence of tetraethyleneglycol. The fluorescence 4 4 Sulfhydryl oligopeptides of the gold nanoclusters bearing sulfhydryl compounds arose from the ligand-to-metal charge transfer from the Cysteinylglycine sulfhydryl compounds to the gold atoms at the gold nanocluster surface. The sulfhydryl oligopeptides cystei- Near infrared fluorescence nylglycine, glutamylcysteine, and glutathione produced a fluorescence band around 830 nm in the NIR region, whereas the sulfhydryl monopeptides cysteine and homocysteine produced fluorescence in the visible region. Among the sulfhydryl oligopeptides, only cysteinylglycine exhibited stable fluorescence without heating the solution. Because the fluorescent gold nanoclusters bearing cysteinylglycine were so stable, monothiols, amine http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Colloids and Surfaces A: Physicochemical and Engineering Aspects Elsevier

Specific turn-on near infrared fluorescence from non-fluorescent gold nanoclusters bearing sulfhydryl oligopeptides

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Publisher
Elsevier
Copyright
Copyright © 2017 Elsevier B.V.
ISSN
0927-7757
eISSN
1873-4359
D.O.I.
10.1016/j.colsurfa.2017.10.057
Publisher site
See Article on Publisher Site

Abstract

Colloids and Surfaces A 538 (2018) 14–22 Contents lists available at ScienceDirect Colloids and Surfaces A journal homepage: www.elsevier.com/locate/colsurfa Research Paper Specific turn-on near infrared fluorescence from non-fluorescent gold nanoclusters bearing sulfhydryl oligopeptides Nobuo Uehara , Natsumi Sonoda, Chikara Haneishi Graduate School of Engineering, Utsunomiya University, 7-1-2 Yoto, Utsunomiya, Tochigi, 321-8585, Japan GR APHICAL A BSTRACT ARTICLE I NFO ABSTRACT Keywords: We describe the development of near-infrared (NIR) fluorescence from non-fluorescent gold nanoclusters as a Gold result of the reaction with sulfhydryl oligopeptides. Non-fluorescent gold nanoclusters with a diameter of about Nanoclusters 2 nm were synthesized by reducing HAuCl with NaBH in the presence of tetraethyleneglycol. The fluorescence 4 4 Sulfhydryl oligopeptides of the gold nanoclusters bearing sulfhydryl compounds arose from the ligand-to-metal charge transfer from the Cysteinylglycine sulfhydryl compounds to the gold atoms at the gold nanocluster surface. The sulfhydryl oligopeptides cystei- Near infrared fluorescence nylglycine, glutamylcysteine, and glutathione produced a fluorescence band around 830 nm in the NIR region, whereas the sulfhydryl monopeptides cysteine and homocysteine produced fluorescence in the visible region. Among the sulfhydryl oligopeptides, only cysteinylglycine exhibited stable fluorescence without heating the solution. Because the fluorescent gold nanoclusters bearing cysteinylglycine were so stable, monothiols, amine

Journal

Colloids and Surfaces A: Physicochemical and Engineering AspectsElsevier

Published: Feb 5, 2018

References

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