期刊
ANALYST
卷 135, 期 1, 页码 111-115出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/b915622d
关键词
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资金
- Natural Science Research Foundation of China [50972050]
- Science Research Foundation of University of Jinan, China [XKY0817]
- Science Research Foundation of Shandong Province, China [Y2007B07]
- National Eleventh Five-Year Plan, China [2006BAJ03A09]
- Postgraduate Innovation Program of Shandong Province [SDYY08030]
A novel fluorescent nanosensor for Sb3+ determination was reported based on thioglycolic acid (TGA)-capped CdTe quantum dot (QD) nanoparticles. It was the first antimony ion sensor using QD nanoparticles in a receptor-fluorophore system. The water-soluable TGA-capped CdTe QDs were prepared through a hydrothermal route, NaHTe was used as the Te precursor for CdTe QDs synthesis. Bovine serumalbumin (BSA) conjugated to TGA-capped CdTe via an amide link interacting with carboxyl of the TGA-capped CdTe. When antimony ion enters the BSA, the lone pair electrons of the nitrogen and oxygen atom become involved in the coordination, switching off the QD emission and a dramatic quenching of the fluorescence intensity results, allowing the detection of low concentrations of antimony ions. Using the operating principle, the antimony ion sensor based on QD nanoparticles showed a very good linearity in the range 0.10-22.0 mu g L-1, with the detection limit lower than 2.94 x 10(-8) g L-1 and the relative standard deviation (RSD) 2.54% (n = 6). In a study of interferences, the antimony-sensitive TGA-QD-BSA sensor showed good selectivity. Therefore, a simple, fast, sensitive, and highly selective assay for antimony has been built. The presented method has been applied successfully to the determination of antimony in real water samples (n = 6) with satisfactory results.
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