期刊
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
卷 413, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jphotochem.2021.113261
关键词
Food analysis; Lanthanide probe; Carbon dots; Ascorbic acid; Ratiometric fluorescence sensor
A ratiometric fluorescence sensor based on the self-assembly of Eu3+ and CDs was developed for the direct detection of AA. The sensor showed excellent sensitivity and selectivity, and demonstrated great potential for the determination of AA in food samples.
We report a ratiometric fluorescence sensor formed via the self-assembly of the lanthanide ion Eu3+ and blueemitting carbon dots (CDs) for the direct detection of ascorbic acid (AA). The obtained sensor exhibited the characteristic emission of 2,6-pyridinedicarboxylic acid (DPA)-sensitized Eu3+ (Eu?DPA) at 615 nm and the weak emission of CDs at 440 nm under excitation at 283 nm. After the addition of AA, the fluorescence emission of Eu?DPA, which served as the AA recognition site, was significantly quenched, whereas the emission of CDs changed slightly, resulting in a ratiometric fluorescent response toward AA. A wide linear range from 0.5 ?M to 820 ?M was achieved in the detection of AA with an LOD of 60 nM. Moreover, this CDs/Eu?DPA sensor, which displayed excellent sensitivity and selectivity, was successfully applied for the determination of AA in fruits, vegetables and beverage samples, suggesting a great potential for applications in foods.
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