Journal
FOOD CHEMISTRY
Volume 368, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2021.130838
Keywords
Ratio fluorescence sensor; PET; Magnetic catalyst; Coumarin
Funding
- National Natural Science Foundation of China [81773681, 81572081, 21904069]
- Natural Science Foundation of Jiangsu Province [BK20190653]
- Chinese Postdoctoral Science Foundation [2019 M661777, 2017 M621789]
- Postdoctoral Science Foundation of Jiangsu [2019 K068, 2019Z176]
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Fe3O4 nanoparticles were used as a magnetic artificial peroxidase to create a high-sensitivity and high-selectivity ratiometric photoluminescence sensor for coumarin based on photoinduced electron transfer. This method showed excellent selectivity and had a detection limit of 0.016 mg/L for coumarin, making it suitable for quantitative analysis in complex matrix samples.
Herein, using Fe3O4 nanoparticles (Fe3O4 NPs) as a magnetic artificial peroxidase, an on-off ' ratiometric photoluminescence sensor with high-sensitivity and high-selectivity for coumarin was constructed based on photoinduced electron transfer (PET) between 7-hydroxycoumarin and rhodamine B (RB). The results showed that Fe3O4 NPs catalyzed H2O2 to generate nucleophilic group center dot OH, which attacked the active site of coumarin and produced strong fluorescent 7-hydroxycoumarin molecules. Then, the fluorescence of RB was quenched with 7-hydroxycoumarin through the PET effect. The ratio signal generated in the above process was used for the quantitative detection of coumarin. Under optimized conditions, the linear range 0.5-25 mg/L was acquired for coumarin with the detection limit of 0.016 mg/L. This method had excellent selectivity and the recovery rate was 81.8%-106.8% with the relative standard deviation less than 5.6%, so it can be used for the quantitative analysis of coumarin in complex matrix samples.
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