Journal
FOOD CHEMISTRY
Volume 379, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2022.132139
Keywords
Fluorescent sensors; Pesticide residues; Visual detection; Food safety
Funding
- Macau Science and Technology Development Fund [147/2019/A3, 0047/2020/AGJ]
- Guangxi Innovation-driven Development Special Foundation Project
- Research Committee of the University of Macau [MYRG2018-00239-ICMS]
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A ratiometric fluorescent sensing system based on carbon quantum dots and copper nanoclusters was developed for rapid and selective detection of pesticides in agricultural products. Smartphone-based colorimetric analysis enabled fast and visual detection of thiram and paraquat.
Agricultural products, such as foodstuffs and herbal medicines, may be contaminated by pesticides. Therefore, developing sensitive methods for pesticide detection are urgently needed for the assurance of food safety. In this study, a ratiometric fluorescent sensing system based on blue-emitted nitrogen-doped carbon quantum dots (N-CQDs) and red-emitted copper nanoclusters (CuNCs) complex was fabricated for pesticide detection. The selective detection of thiram and paraquat, two typical widely used pesticides, can be easily realized by changing the solvent environment. The detection limit can be reached as low as 7.49 nM and 3.03 nM, respectively. A good linear correlation was found over the concentration range from 10 to 500 nM for thiram and 5 to 100 nM for paraquat. More interestingly, fast and visual detection of thiram and paraquat can be achieved via smartphonebased colorimetric analysis, which has provided an effective implementation for on-site monitoring of the levels of pesticide residues in food.
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