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Copper Ions Assisted Fluorescent Detection of Some Dithiocarbamates Based on Nickel Nanocluster With Aggregation-induced Emission Enhancement Behavior
Journal of Hazardous Materials ( IF 12.2 ) Pub Date : 2021-10-20 , DOI: 10.1016/j.jhazmat.2021.127555
Zehua Cheng 1 , Liqiang Gu 1 , Yunyang Zhao 2 , Lele Yang 1 , Ling Chen 1 , Ting Wang 1 , Mai Luo 1 , Jinchao Wei 1 , Peng Li 1
Affiliation  

Pesticide residue contamination has become an urgent issue since it threatens both the natural environment and public health. In this study, a fluorescent method for detecting dithiocarbamate (DTC) compounds was constructed based on novel nickel nanoclusters (Ni NCs) and copper ions (Cu2+). The water-soluble fluorescent Ni NCs were synthesized for the first time through a one-pot method using glutathione as stabilizer and ascorbic acid as reducing agent. The as-prepared Ni NCs exhibited a maximum fluorescence emission at 445 nm when excited by 380 nm. And they displayed aggregation-induced emission enhancement when ethylene glycol was introduced into the nanocluster aqueous solution. Based on the Ni NCs, a label-free fluorescence quenching sensor was established for sensitive and selective detection of DTC compounds with the assistance of Cu2+. The complex formed by DTC and Cu2+ led to fluorescence quenching of Ni NCs through inner filter effect. The sensing method was successfully applied to two typical DTC compounds, thiram and disulfiram, with good linearity over a wide linear range and a low detection limit. Moreover, the proposed approach was capable of thiram detection in real samples, which confirms the potential of this sensing method as a platform for DTC compound detection.



中文翻译:

基于镍纳米团簇的铜离子辅助荧光检测具有聚集诱导发射增强行为的二硫代氨基甲酸盐

农药残留污染已成为一个紧迫的问题,因为它威胁到自然环境和公众健康。本研究基于新型镍纳米团簇(Ni NCs)和铜离子(Cu 2+)构建了一种检测二硫代氨基甲酸盐(DTC)化合物的荧光方法。首次以谷胱甘肽为稳定剂,抗坏血酸为还原剂,通过一锅法合成了水溶性荧光镍纳米晶。 当被 380 激发时,所制备的 Ni NCs 在 445 nm 处表现出最大的荧光发射 纳米。当乙二醇被引入纳米团簇水溶液时,它们表现出聚集诱导的发射增强。基于Ni NCs,建立了一种无标记荧光猝灭传感器,用于在Cu 2+的辅助下灵敏、选择性地检测DTC化合物。DTC和Cu 2+形成的络合物通过内滤效应导致Ni NCs的荧光猝灭。该传感方法成功应用于两种典型的DTC化合物,福美双和双硫仑,在较宽的线性范围内具有良好的线性和较低的检测限。此外,所提出的方法能够在实际样品中检测福美双,这证实了这种传感方法作为 DTC 化合物检测平台的潜力。

更新日期:2021-10-20
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