A turn-on fluorescent chemosensor selectively detects cyanide in pure water and food sample

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 selectively detects cyanide in pure water and food sample

2016

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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