期刊
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
卷 69, 期 9, 页码 2689-2696出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jafc.0c08212
关键词
organophosphorus pesticide; cadmium telluride quantum dots; acetylcholinesterase; residue; distribution; and variation; food safety
资金
- National Natural Science Foundation of China [22076090, 21775082]
- Shandong Province Higher Educational Program for Young Innovation Talents
- Major Program of Shandong Province Natural Science Foundation [ZR2018ZC0127]
- Special Foundation for Distinguished Taishan Scholar of Shandong Province [ts201511052]
A fluorescence sensor based on CdTe quantum dots has been developed for detecting organophosphorus pesticides, showing promising applications in monitoring residue and distribution of pesticides in crops and soil.
Development of simple, sensitive, and reliable fluorescence sensors for monitoring the residue, distribution, and variation of organophosphorus pesticides (OPs) in agricultural crops is highly urgent but remains challenging, which is ascribed to deprivation of an ideal fluorophore and ingenious detection strategy. Herein, we report the fabrication of cadmium telluride quantum dots (CdTe QDs) with bright emission, good water dispersion, and long emission wavelength for OP screening based on the unique response of CdTe QDs to pH and the inhibition of OPs on acetylcholinesterase (AChE) activity. AChE catalyzed hydrolysis of acetylcholine (ACh) into CH3COOH, which protonated CdTe QDs to decline the fluorescence, whereas target OP impeded AChE from catalyzing hydrolysis of ACh into CH3COOH, making little influence in fluorescence of CdTe QDs. On the basis of the change in fluorescence, sensitive detection of OP was acquired, with the limit of detection at 0.027 ng/mL, which was comparable or lower than that of most known OP sensors. Furthermore, the CdTe-QD-based sensor was successfully applied for precisely monitoring the residue, distribution, and variation of methidathion in Chinese cabbage and cultivated soil. Therefore, the proposed sensor was anticipated to supply a promising alternative for food safety guarantee and was an valuable application for OP screening.
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