A turn-on fluorescent chemosensor selectively detects cyanide in pure water and food sample
2016
Wei, Tai-Bao | Li, Wen-Ting | Li, Qiao | Su, Jun-Xia | Qu, Wen-Juan | Lin, Qi | Yao, Hong | Zhang, You-Ming
A turn-on fluorescent chemosensor (H-1) for cyanide anions based on dihydroxy phenazine was designed and synthesised. The sensor H-1 exhibits high sensitivity and good selectivity for cyanide in pure water. The CN− response mechanism involves a hydrogen bonding and deprotonation process in the sensor, which induced prominent fluorescence enhancement. The detection limit of the sensor toward CN− is 5.65×10−7M, and other anions had nearly no influence on the probing behavior. In addition, test strips based on the sensor were fabricated, which also exhibit a good selectivity to CN− in water. Notably, this sensor was successfully applied to detect CN− in food samples, which proves a very simple and selective platform for on-site monitoring of CN− in agriculture samples.
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