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Halobenzoquinone-mediated assembly of amino acid modified Mn-doped ZnS quantum dots for halobenzoquinones detection in drinking water
- Source :
- Analytica Chimica Acta. 1026:147-154
- Publication Year :
- 2018
- Publisher :
- Elsevier BV, 2018.
-
Abstract
- Halobenzoquinones (HBQs) were reported as disinfection byproducts (DBPs) which had potential risk of bladder cancer. In this paper, a highly selective analytical method for HBQs was developed by HBQs-mediated assembly of amino acid modified Mn-doped ZnS/Quantum Dots (Mn: ZnS QDs). In the presence HBQs, a charge-transfer complex (CTC) was formed between aromatic rings of HBQs and the primary amino groups on the surface of the QDs. The formation of CTC led to the aggregation of QDs, as a result fluorescence decreasing occurred. The decrease was correlated with the concentration of HBQs. Then a fluorescence sensor array for discrimination of three kinds of HBQs including 2,6-Dichloro-1,4-benzoquinone (DCBQ), 2,6-Dibromo-1,4-benzoquinone (DBBQ) and 2,3,6-trichloro-1,4-benzoquinone (TCBQ) was developed. Four kinds of amino acids including cysteine, threonine, tyrosine and tryptophan were embellished on the Mn: ZnS QDs. The different extents of aggregation led to different fluorescence decreasing effect, thus distinct fluorescence patterns were created. It showed that three kinds of HBQs could be discriminated successfully by fluorescence sensor array at a range of concentrations through principal component analysis (PCA). The unknown samples were predicted by with a stepwise linear discriminant analysis (SLDA) using Mahalanobis distance as a selection criterion with accuracy of 100%. Remarkably, the practicability of the proposed sensor array was further validated by identification of three kinds of HBQs at different concentrations in real drinking water samples. Compared to LC/MS/MS, this fluorescent sensor array-based method was proved to be more convenient since the nanoparticles can be prepared flexibly according to the property of the target.
- Subjects :
- Halogenation
Analytical chemistry
Nanoparticle
Sulfides
010501 environmental sciences
01 natural sciences
Biochemistry
Analytical Chemistry
Sensor array
Quantum Dots
Benzoquinones
Environmental Chemistry
Amino Acids
Spectroscopy
0105 earth and related environmental sciences
chemistry.chemical_classification
Manganese
Principal Component Analysis
Drinking Water
010401 analytical chemistry
Tryptophan
Discriminant Analysis
Aromaticity
Fluorescence
0104 chemical sciences
Amino acid
chemistry
Zinc Compounds
Quantum dot
Water Pollutants, Chemical
Cysteine
Subjects
Details
- ISSN :
- 00032670
- Volume :
- 1026
- Database :
- OpenAIRE
- Journal :
- Analytica Chimica Acta
- Accession number :
- edsair.doi.dedup.....b5f25d768a4ed86ac95d4984510611a7