期刊
TALANTA
卷 178, 期 -, 页码 1046-1052出版社
ELSEVIER
DOI: 10.1016/j.talanta.2017.08.086
关键词
Aptamer; Single walled carbon nanotubes; Copper oxide nanoflowers; Chlorpyrifos; Regenerative
资金
- National Natural Science Foundation of China [31171684, 31101284]
- Chongqing Science and Technology Commission [CSTC2015shmszxl20097]
- Chongqing Graduate Student Research Innovation Project [CYB16038]
- Workstation in Sichuan Province [GY2015-01]
- sharing fund of Chongqing university's large equipment
Chlorpyrifos is a commonly used organophosphorus pesticide in agriculture. However, its neurotoxicity poses a huge threat to human health. To detect trace amounts of chlorpyrifos, we herein developed a regenerative electrochemical aptasensor for the sensitive detection of chlorpyrifos. The nanocomposite consisting of copper oxide nanoflowers (CuO NFs) and carboxyl-functionalized single walled carbon nanotubes (c-SWCNTs) was prepared to improve the sensing performance for chlorpyrifos detection. Various characterization methods such as scanning electron microscopy (SEM), fourier transform infrared spectroscopy (FT-IR) and cyclic voltammetry (CV) were used to demonstrate the successful fabrication of biosensor. Differential pulse voltammetry (DPV) was utilized to optimize test conditions and quantify chlorpyrifos. Under optimal conditions, the biosensor obtained a good linearity for chlorpyrifos ranging from 0.1 to 150 ng/mL, with a lower detection limit of 70 pg/mL. This aptasensor also exhibited high selectivity and outstanding repeatability, and was successfully applied to the determination of chlorpyrifos in spiked apple and celery cabbage with satisfactory recoveries. Furthermore, the sensor can be easily regenerated by urea for continuous application. With all the features, the proposed strategy provides an excellent platform for regenerative and selective detection of chlorpyrifos.
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