Mono-6-thio-β-cyclodextrin-functionalized AuNP/two-dimensional TiO2 nanosheet nanocomposite for the electrochemical determination of trace methyl parathion in water

文献情報

出版日 2019-09-06

DOI 10.1039/C9AY01338E

インパクトファクター 2.896

著者

Xuan-Hua Li, Jian Zhang, Gan Wei

原文を見る

要旨

In this study, two-dimensional (2D) TiO2 nanosheets (TiO2NSs) composited with Au nanoparticles and mono-6-thio-β-cyclodextrin (SH-β-CD) monolayers were prepared for constructing an electrochemical sensing interface on a glassy carbon electrode (SH-β-CD/AuNP/TiO2NS/GCE) surface. Because of the outstanding advantages of a large active surface area, excellent electron-transfer speed and electrocatalytic activity of AuNPs/TiO2NSs and the selective recognition properties of SH-β-CD, the as-prepared sensor could remarkably improve the electrochemical response signals of trace methyl parathion (MP) pesticide. The square-wave voltammetry (SWV) signal of MP at the as-prepared sensor was ca. 4.2 and 5.7 times larger than that at the AuNP/TiO2NS/GCE and TiO2NS/GCE without SH-β-CD, respectively, while a weak SWV signal was detected at the AuNP/GCE. Therefore, both AuNP/TiO2NS hybrids and SH-β-CD played important roles in the sensing of MP. A wide linear relationship was obtained between the SWV signals and MP concentrations from 1.5–60.0 nM with a low MP detection limit of 0.05 nM (0.012 ppb) being experimentally achieved under the optimum conditions. The as-prepared sensor also showed a higher response selectivity to MP than to other aromatic pesticide molecules and was further applied in the determination of MP in real river samples.

掲載誌

Analytical Methods

CiteScore: 5.1

自己引用率: 3.7%

年間論文数: 655

Analytical Methods welcomes early applications of new analytical and bioanalytical methods and technology demonstrating the potential for societal impact. We require that methods and technology reported in the journal are sufficiently innovative, robust, accurate, and compared to other available methods for the intended application. Developments with interdisciplinary approaches are particularly welcome. Systems should be proven with suitably complex and analytically challenging samples. We encourage developments within, but not limited to, the following technologies and applications: global health, point-of-care and molecular diagnostics biosensors and bioengineering drug development and pharmaceutical analysis applied microfluidics and nanotechnology omics studies, such as proteomics, metabolomics or glycomics environmental, agricultural and food science neuroscience biochemical and clinical analysis forensic analysis industrial process and method development