期刊
MICROCHIMICA ACTA
卷 186, 期 8, 页码 -出版社
SPRINGER WIEN
DOI: 10.1007/s00604-019-3700-6
关键词
Composite probe; Fluorometric assay; Doped carbon dots; Adsorbed complex; Phosphate detection; Displacement approach; Confocal imaging; Inner filter effect
资金
- Natural Science Research Project of Anhui Province [KJ2018A0513]
- Doctor Foundation of Anhui Jianzhu University [2016QD108]
- National Natural Science Foundation of China [21506002, 41673131, 21671003, 21876001]
- Postdoctor Foundation [2017 M612091]
A composite probe has been developed for fluorometric determination and imaging of phosphate in real water samples and in cells. The method is based on the use of weakly blue fluorescent bromine-doped carbon dots (C-dots) containing aromatic carbon-bromine groups and loaded with Fe3+ ions. The carboxy, phenolic hydroxy and aldehyde groups on the surface of the C-dots can coordinate with Fe3+ to form an adsorbed complex that reduces the blue fluorescence through an inner filter effect. If phosphate is added, it will capture Fe3+ on the surface of C-dots and restore fluorescence by 88% via a displacement approach. The probe, best operated at excitation/emission maxima of 370/418nm, has a linear response in the 0.4 to 22 mu M phosphate concentration range and a 0.25 mu M of detection limit. The relative standard deviation (at a phosphate level of 8.0 mu M) is 3.6% (for n=5). The method was applied to confocal imaging of phosphate in HeLa cells.
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