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A quinoline-coumarin near-infrared ratiometric fluorescent probe for detection of sulfur dioxide derivatives. | LitMetric
Sulfur dioxide derivatives (HSO and SO) play an important role in food preservative, antibacterial, antioxidant and other aspects, so it is urgent for us to develop more efficient detection methods to broaden their application in biochemical research and related disease diagnosis. Fluorescent probes are of particular interest because of their simplicity and high temporal and spatial resolution. Herein, we constructed a new near-infrared (NIR) fluorescence probe, CQC, composed of coumarin fluorophore and quinoline fluorophore, for detecting SO derivatives. The near-infrared emission probe CQC with a large Stokes shift (260 nm) not only kept the distance between the two emission peaks large enough (165 nm), but also had a particularly high energy transfer efficiency (99.5%), and was particularly sensitive to the detection of HSO/SO (LOD: 0.1 μM). The powerful probe CQC succeeded in real-time visualizing endogenous HSO/SO in living cells.
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quinoline-coumarin near-infrared
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