Selective detection of paraquat by a cucurbit[7]uril-based fluorescent probe

IF 1.5 4区 农林科学 Q2 ENTOMOLOGY Journal of Pesticide Science Pub Date : 2024-03-23 DOI:10.1584/jpestics.d23-062
Pei-Hui Shan, Ding-Wu Pan, Chun-Rong Li, Tie-Hong Meng, Carl Redshaw, Zhu Tao, Xin Xiao
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Abstract

A simple fluorescent “on-off” system that can be utilized for the selective identification and determination of paraquat (PQ) is presented herein. 1H NMR spectroscopic data indicated that in aqueous solution the alkaloid palmatine can be partially encapsulated within the cucurbit[7]uril (Q[7]) cavity, whereby a stable 1 : 1 host–guest inclusion complex is formed. Other characterization techniques including mass spectrometry, UV-Vis and fluorescence spectroscopy also provided further evidence, and the host-guest inclusion complex was found to exhibit reasonable fluorescence intensity. It is noteworthy that the addition of PQ resulted in quenching the fluorescence of the host-guest inclusion complex, whereas the presence of 12 other pesticides did not significantly affect the fluorescence intensity. Given the linear relationship between the intensity of the fluorescence and the PQ concentration, the PQ concentration in aqueous solution was easily detected. Thus, a new method for identifying and determining the fluorescence quenching of PQ has been developed in this work.

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基于葫芦[7]脲的荧光探针对百草枯的选择性检测
本文介绍了一种可用于选择性识别和测定百草枯(PQ)的简单荧光 "开关 "系统。1H NMR 光谱数据表明,在水溶液中,生物碱巴马汀可被部分包裹在葫芦[7]脲(Q[7])空腔中,从而形成稳定的 1 :1 的主客体包合物。质谱、紫外可见光谱和荧光光谱等其他表征技术也提供了进一步的证据,并发现主-客包合物表现出合理的荧光强度。值得注意的是,加入 PQ 会导致淬灭主-客体包合物的荧光,而其他 12 种农药的存在对荧光强度没有明显影响。由于荧光强度与 PQ 浓度呈线性关系,因此很容易检测出水溶液中的 PQ 浓度。因此,这项工作开发了一种识别和测定 PQ 荧光淬灭的新方法。
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来源期刊
Journal of Pesticide Science
Journal of Pesticide Science 农林科学-昆虫学
CiteScore
4.30
自引率
4.20%
发文量
28
审稿时长
18-36 weeks
期刊介绍: The Journal of Pesticide Science publishes the results of original research regarding the chemistry and biochemistry of pesticides including bio-based materials. It also covers their metabolism, toxicology, environmental fate and formulation.
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