期刊
FOOD CHEMISTRY
卷 345, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2020.128839
关键词
Food safety; Ratiometric fluorescence; MOFs; Pesticide; Carbendazim
资金
- National Natural Science Foundation of China [32060571, 31801628]
- Special Program Central Government of China for Local Science and Technology Development of Gansu [QNKB2-4]
A ratiometric fluorescent sensor utilizing the innate fluorescence of MBC and fluorescent UiO-67 was successfully fabricated for sensitive detection of MBC in food samples. The sensor showed low detection limit, strong anti-interference capability, and accurate detection of MBC residues in fruits and vegetables such as apples, cucumbers, and cabbage.
A ratiometric fluorescent sensor was facilely fabricated using innate fluorescence of carbendazim (MBC) and fluorescent UiO-67 to sensitively and selectively detect MBC in food matrixes. The innate fluorescence of MBC provided a signal at 311 nm (F-311), and the fluorescent UiO-67 at 408 nm (F-408) could recognize MBC through pi-pi stacking inducing fluorescent quenching relied on photoelectron transfer (PET). The ratio (F-311/F-408) of the fluorescence enhancement of MBC and the quenching of UiO-67 linearly responded to the MBC concentrations of 0-47.6 mu mol/L with a low limit of detection (LOD) of 3.0 x 10(-3) mu mol/L. The reverse response signals of the sensor enhanced the sensitivity toward MBC and presented remarkable anti-interference capability in complex matrices. The as-prepared sensor was applied to detect MBC residues in apple, cucumber and cabbage, obtaining satisfactory accuracy and precision with the recovery of 90.82-103.45% and RSDs of lower than 3.03%.
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