Journal
RSC ADVANCES
Volume 9, Issue 55, Pages 32308-32312Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9ra06342k
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Funding
- NSF of China [21705104]
- Youth Top Talent Plans of Shanxi Province
- Scientific and Technological Innovation Programs of Higher Education Institutions in Shanxi [2019L0406]
- Key Research and Development Projects of Shanxi Province [201703D321015-2]
- Youth Science Foundation of Shanxi Province [201701D221064]
- Startup Foundation for Doctors of Shanxi Medical University [03201601]
- National Students' Innovation and Entrepreneurship Training Program [201810114012]
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A highly sensitive and selective fluorescent probe for fluoride ions has been developed by incorporating the dimethylphosphinothionyl group as a recognition moiety into the fluorophore of coumarin. The detection mechanism is based on the fluoride ion-triggered cleavage of the dimethylphosphinothionyl group, followed by the release of coumarin, which leads to a large fluorescence enhancement at 455 nm (lambda(ex) = 385 nm). Under the optimized conditions, the fluorescence enhancement of the probe is directly proportional to the concentration of fluoride ions in the range of 0-30 mu M with a detection limit of 0.29 mu M, which is much lower than the maximum content of fluoride ions guided by WHO. Notably, satisfying results have been obtained by utilizing the probe to determine fluoride ions in real-water samples and commercially available toothpaste samples. The proposed probe is rather simple and may be useful in the detection of fluoride ions in more real samples.
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