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Article Abstract
Sulfur dioxide (SO) is widely used in food processing to extend the shelf life of food. However, excessive intake of SO and its derivatives (HSO and SO) can cause oxidative damage to the body, and result in several diseases. How to construct probes for rapid real-time detection of HSO in the field is beneficial to the developmental needs of practical applications, but it is also very challenging. Here we report a dual-mode fluorescent probe Rh-QL for ultrafast detection of HSO, which undergoes a specific 1,4-Michael addition reaction with HSO to achieve near-infrared fluorescence turn-on. Probe Rh-QL can rapidly (< 5 s) respond to HSO with a color change from purple to green and a strong fluorescence emission at 725 nm. The probe Rh-QL has been used for the detection of HSO in real sugar samples and can be prepared as a portable sensing kit for the detection of HSO in the environment due to its high efficiency, rapidity and accuracy. In addition, the probe Rh-QL is able to target label Gram-negative bacteria after reacting with HSO, which has the potential to identify the type of pathogenic bacteria.
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