Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 11, Issue 31, Pages 27605-27614Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b09849
Keywords
portable kit; smartphone; pesticide; enzyme; hydrogel
Funding
- National Key Research and Development Program of China [2016YFC0207300]
- National High-Tech Research and Development Program of China [2014AA06A505]
- National Nature Science Foundation of China [61722305, 61833006, 61831011, 21806051]
- Science and Technology Development Program of Jilin Province [2017052016JH]
- Fundamental Research Funds for the Central Universities
- Graduate Innovation Fund of Jilin University [101832018C016]
- Program for JLU Science and Technology Innovative Research Team (JLUSTIRT) [2017TD-07]
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Precise on-site profiling of organophosphate pesticides (OPs) is of significant importance for monitoring pollution and estimating poisoning. Herein, we designed a simple and convenient portable kit based on Ag+-responsive hydrogels for accurate detection of OPs. The newly developed hydrogels employed o-phenylenediamine (OPD) and silicon quantum dots (SiQDs) as indicator, which possessed ratiometric response. In this sensor, OPs as inhibitor of acetylcholinesterase prevented the generation of thiocholine, which blocked the formation of metal-polymer with Ag+, further triggered the oxidation of OPD to yield yellow 2,3-diaminophenazine (DAP) with fluorescence emission at 557 nm. The fluorescence intensity of SiQDs (444 nm) was quenched by DAP through inner filter effect (IFE) process, emerging a typical ratiometric response. Interestingly, the ratiometric signal of kit, which was recorded by smartphone's camera, can be transduced by Image) software into the hue parameter that was linearly proportional to the concentration of OPs. The simplicity of portable kit combined with smartphone operation, which possessed high sensitivity (detection limit <10 ng mL(-1)) and rapid sample-to-answer detection time (45 min) in agricultural sample, indicating that the methodology offered a new sight for portable monitoring of food safety and human health.
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