Probing the sensitive and selective luminescent detection of peroxynitrite using thiol-capped CdTe and CdTe@ZnS quantum dots

被引：47

作者：

Adegoke, Oluwasesan ^{[1
]}

Nyokong, Tebello ^{[1
]}

机构：

[1] Rhodes Univ, Dept Chem, ZA-6140 Grahamstown, South Africa

来源：

JOURNAL OF LUMINESCENCE | 2013年 / 134卷

基金：

新加坡国家研究基金会;

关键词：

Fluorescence quenching; Quantum dots; Peroxynitrite; Glutathione; Mercaptopropionic acid; NITRIC-OXIDE; HYDROGEN-PEROXIDE; OPTICAL-DETECTION; SUPEROXIDE; OXYGEN; CDSE; PHOTOLUMINESCENCE; QUANTIFICATION; NANOCRYSTALS; SEPARATION;

D O I：

10.1016/j.jlumin.2012.08.002

中图分类号：

O43 [光学];

学科分类号：

070207 [光学];

摘要：

CdTe and CdTe@ZnS quantum dots (QDs) capped with 3-mercaptopropionic acid (MPA), thioglycolic acid (TGA), or glutathione (GSH) have been employed for the first time as luminescent probes for the sensitive and selective detection of peroxynitrite (ONOO-) in aqueous solution. The sensitivity of the proposed probe followed the order: MPA-(TGA)-CdTe@ZnS > GSH-(TGA)-CdTe@ZnS > MPA-CdTe QDs. The varying degree of quenching is elucidated based on the QD-thiolate bond of CdTe@ZnS being more sensitive to oxidation from ONOO- than CdTe. The selectivity of the probe in the presence of coexisting species followed the order: GSH-(TGA)-CdTe@ZnS > MPA-(TGA)-CdTe@ZnS > MPA-CdTe QDs. QDs capped with MPA showed less selectivity for ONOO- than GSH. The best limit of detection (LOD) of 12.6 nM was obtained for MPA-(TGA)-CdTe@ZnS QDs. Time-resolved fluorescence measurements indicated that the interaction between ONOO- and the QDs is static in nature. (c) 2012 Elsevier B.V. All rights reserved.

引用

页码：448 / 455

页数：8

共 54 条

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Interaction of CdTe Quantum Dots with 2,2-Diphenyl-1-Picrylhydrazyl Free Radical: A Spectroscopic, Fluorimetric and Kinetic Study [J].