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

Shan, Pei Hui; Pan, Ding Wu; Li, Chun Rong; Meng, Tie Hong; Redshaw, Carl; Tao, Zhu; Xiao, Xin

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.

Citation

Shan, P. H., Pan, D. W., Li, C. R., Meng, T. H., Redshaw, C., Tao, Z., & Xiao, X. (2024). Selective detection of paraquat by a cucurbit[7]uril-based fluorescent probe. Journal of Pesticide Science, 49(2), 114-121. https://doi.org/10.1584/JPESTICS.D23-062

• Journal Article Type: Article
• Acceptance Date: Feb 6, 2024
• Publication Date: Jan 1, 2024
• Deposit Date: Jul 13, 2024
• Publicly Available Date: Jul 16, 2024
• Journal: Journal of Pesticide Science
• Print ISSN: 1348-589X
• Electronic ISSN: 1349-0923
• Peer Reviewed: Peer Reviewed
• Volume: 49
• Issue: 2
• Pages: 114-121
• DOI: https://doi.org/10.1584/JPESTICS.D23-062
• Keywords: Cucurbit[n]urils; Supramolecular assembly; Selective recognition; Fluorescent probe; Host–guest chemistry
• Public URL: https://hull-repository.worktribe.com/output/4736245