期刊
ANALYTICAL CHEMISTRY
卷 90, 期 21, 页码 12846-12853出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.analchem.8b03394
关键词
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资金
- National Natural Science Foundation of China [21605003, 21656001, 21521005, 21575010]
- National Basic Research Program of China (973 Program) [2014CB932103]
- China Postdoctoral Science Foundation [2016M600899]
- Fundamental Research Funds for the Central Universities [buctrc201619]
The rapid discrimination of nitrophenol isomers has been a long-standing challenge because of the tiny structural differences among the isomers. In this study, a fluorescent sensor array based on three different-color emitting gold nanoclusters (Au NCs) that were functionalized with three different ligands and a cocapping ligand beta-cyclodextrin (beta-CD) has been constructed for the facile discrimination of three nitrophenol isomers via the linear discriminant analysis of isomer-induced fluorescence quenching patterns. The fluorescence quenching occurs in two steps: first, beta-CDs adsorb nitrophenol isomers onto the surface of Au NCs via a host-guest interaction; second, each nitrophenol isomer quenches the fluorescence of a specific type of Au NCs through diverse inner filter effect. The different binding affinities between beta-CD and each nitrophenol isomer, as well as the distinct quenching efficiencies of the isomers on the fluorescence of each Au NCs, enable an excellent discrimination of the three isomers at a concentration of 5 mu M, when linear discriminant and hierarchical cluster analyses were smartly combined. In addition, even a mixture of two isomers could be distinguished with the proposed sensor array. The practicability of this developed sensor array is validated by a high accuracy (98.0%) examination of 51 unknown samples containing a single isomer or a mixture of two isomers.
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