期刊
TALANTA
卷 122, 期 -, 页码 157-165出版社
ELSEVIER
DOI: 10.1016/j.talanta.2014.01.031
关键词
Fluorescence enhancing; Surface passivation; Glutathione; CdTe quantum dots; Flow analysis
资金
- Fundacao para a Ciencia e Tecnologia
- FSE [SFRH/BD/70444/2010]
- COMPETE/QREN/FEDER [PTDC/QUI-Q1JI/105514/2008]
- Fundação para a Ciência e a Tecnologia [SFRH/BD/70444/2010] Funding Source: FCT
The manipulation of the surface chemistry of semiconductor nanocrystals has been exploited to implement distinct sensing strategies in many analytical applications. In this work, reduced glutathione (GSH) was added at reaction time, as an electron-donor ligand, to markedly increase the quantum yield and the emission efficiency of MPA-capped CdTe quantum dots. The developed approach was employed in the implementation of an automated flow methodology for hydrogen peroxide determination, as this can oxidize GSH preventing its surface passivating effect and producing a manifest fluorescence quenching. After optimization, linear working calibration curve for hydrogen peroxide concentrations between 0.0025% and 0.040% were obtained (n=6), with a correlation coefficient of 0.9975. The detection limit was approximately 0.0012%. The developed approach was employed in the determination of H2O2 in contact lens preservation solutions and the obtained results complied with those furnished by the reference method, with relative deviations comprised between -1.18 and 4.81%. (C) 2014 Elsevier B.V. All rights reserved.
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