Cu 2+ -Triggered Carbon Dots with Synchronous Response of Dual Emission for Ultrasensitive Ratiometric Fluorescence Determination of Thiophanate-Methyl Residues.

Autor: Han Y; College of Food Science and Engineering , Northwest A&F University , Yangling , Shaanxi 712100 , PR China., Yang W; College of Food Science and Engineering , Northwest A&F University , Yangling , Shaanxi 712100 , PR China., Luo X; College of Food Science and Engineering , Northwest A&F University , Yangling , Shaanxi 712100 , PR China., He X; College of Food Science and Engineering , Northwest A&F University , Yangling , Shaanxi 712100 , PR China., Yu Y; College of Food Science and Engineering , Northwest A&F University , Yangling , Shaanxi 712100 , PR China., Li C; College of Food Science and Engineering , Northwest A&F University , Yangling , Shaanxi 712100 , PR China., Tang W; College of Food Science and Engineering , Northwest A&F University , Yangling , Shaanxi 712100 , PR China., Yue T; College of Food Science and Engineering , Northwest A&F University , Yangling , Shaanxi 712100 , PR China.; Laboratory of Quality & Safety Risk Assessment for Agro-products (Yangling) , Ministry of Agriculture , Yangling , Shaanxi 712100 , PR China.; National Engineering Research Center of Agriculture Integration Test (Yangling) , Yangling , Shaanxi 712100 , PR China., Li Z; College of Food Science and Engineering , Northwest A&F University , Yangling , Shaanxi 712100 , PR China.; Laboratory of Quality & Safety Risk Assessment for Agro-products (Yangling) , Ministry of Agriculture , Yangling , Shaanxi 712100 , PR China.; National Engineering Research Center of Agriculture Integration Test (Yangling) , Yangling , Shaanxi 712100 , PR China.
Jazyk: angličtina
Zdroj: Journal of agricultural and food chemistry [J Agric Food Chem] 2019 Nov 13; Vol. 67 (45), pp. 12576-12583. Date of Electronic Publication: 2019 Oct 30.
DOI: 10.1021/acs.jafc.9b04720
Abstrakt: Copper ion (Cu 2+ )-triggered carbon dots (CDs/Cu) with dual emissions were utilized to develop a ratiometric fluorescence sensor for ultrasensitive detection of inert thiophanate-methyl (TM). TM could be recognized by CDs/Cu through π-π stacking and could chelate Cu 2+ of CDs/Cu through metal ion coordination, inducing synchronous fluoresent quenching of the dual emission of CDs/Cu based on the excited state intramolecular proton transfer and the ligand-to-metal charge transfer. The fluorescence ratio of CDs/Cu ( F 416 / F 481 ) linearly responded in a TM concentration of 0.10-20.00 μmol/L with an ultralow limit of detection of 2.90 × 10 -6 μmol/L. A synchronous response of the ratiometric sensor enhanced the specificity toward TM and presented remarkable capability of anti-interference in complex matrices. The sensor exhibited satifactory accuracy and precision for practical applications with recoveries of 88.33-101.09% and relative standard deviations of 1.61-5.06%, demonstrating an ultrasensitive ratiometric fluorescent nanosensor for detecting pesticides residues in complex matrices.
Databáze: MEDLINE
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