Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 423, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2021.127077
Keywords
Coordination polymer; Oxidase-like activity; Stimulus-responsive luminescence; Pesticide; Dual-mode detection
Categories
Funding
- Key Laboratory of Func-tional Molecular Solids, Ministry of Education [FMS202001]
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology [ES202122]
- Project for Excellent Young Teachers of Jiangsu University [4111310004]
- National Natural Science Foundation of China [21605061]
Ask authors/readers for more resources
A dual-mode fluorescence and colorimetric method for pesticide determination has been proposed, showing good sensitivity and excellent interference tolerance in real sample matrices. The method has great potential for the facile and reliable monitoring of pesticide residues.
The great threat of pesticide residues to the environment and human health has drawn widespread interest to explore approaches for pesticide monitoring. Compared to commonly developed single-signal pesticide assays, multi-mode detection with inherent self-validation and self-correction is expected to offer more reliable and antiinterference results. However, how to realize multi-mode analysis of pesticides still remains challenging. Herein, we propose a dual-mode fluorescence and colorimetric method for pesticide determination by integrating stimulus-responsive luminescence with oxidase-mimetic activity into cerium-based coordination polymer nanoparticles (CPNs(IV)). The CPNs(IV) exhibit good oxidase-like activity of catalyzing the colorless 3,3 ',5,5 ' tetramethylbenzidine (TMB) oxidation to its blue oxide, offering a visible color signal; by employing acid phosphatase (ACP) to hydrolyze ascorbic acid 2-phosphate (AAP), the generated ascorbic acid (AA) can chemically reduce the CPNs(IV) to CPNs(III), which exhibit a remarkable fluorescence signal but lose the oxidasemimicking ability to trigger the TMB chromogenic reaction; when pesticides exist, the enzymatic activity of ACP is restrained and the hydrolysis of AAP to AA is blocked, leading to the recovery of the catalytic TMB chromogenic reaction but the suppression of the fluorescence signal of CPNs(III). According to this principle, by taking malathion as a pesticide model, dual-mode 'off-on-off' fluorescence and 'on-off-on' colorimetric detection of the pesticide with good sensitivity was realized. Excellent interference-tolerance and reliability were verified by applying it to analyze the target in real sample matrices. With good performance and practicability, the proposed dual-mode approach shows great potential in the facile and reliable monitoring of pesticide residues.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available