期刊
ANALYTICAL CHEMISTRY
卷 91, 期 17, 页码 11455-11460出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.analchem.9b02938
关键词
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资金
- National Natural Science Foundation of China [21765004, 21365006]
- Guangxi Science Foundation of China [2014GXNSFDA118004, 1598025-4]
- Innovation Project of Guangxi Graduate Education [YCSZ2013039]
- State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources (Guangxi Normal University) [CMEMR2017-A5]
A hydrothermal strategy for preparing boron and nitrogen codoped carbon quantum dots was studied using the precursors of p-amino salicylic acid, boric acid and ethylene glycol dimethacrylate. The boron and nitrogen codoped carbon quantum dots have high fluorescence intensity, good monodispersity, high stability, superior water solubility, and a fluorescence quantum yield of 19.6%. Their average size is 5 nm. Their maximum excitation and emission wavelengths are 380 and 520 nm, respectively. Permanganate (MnO4-) quenched boron and nitrogen codoped carbon quantum dots fluorescence through inner filter effect and static quenching effects. The linear relation between quenching efficiency and MnO4- concentration ranged from 0.05 to 60 ymol/L with a detection limit of 13 nmol/L. In the presence of captopril, MnO4- was reduced to Mn2+ and the fluorescence of boron and nitrogen codoped carbon quantum dots was recovered. The linear range between recovery and captopril concentration was from 0.1 to 60 mu mol/L. The limit of detection was 0.03 mu mol/L. The developed method can be employed as a sensitive fluorescence sensing platform for MnO4-. It has been successfully used for captopril detection in mouse plasma.
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