Li Yangjie, Sun Qin, Su Lei, Yang Linlin, Zhang Jian, Yang Liang, Liu Bianhu, Jiang Changlong, Zhang Zhongping
Institute of Intelligent Machines, Chinese Academy of Sciences Hefei Anhui 230031 China
Department of Chemistry, University of Science and Technology of China Hefei Anhui 230026 China.
RSC Adv. 2018 Feb 27;8(16):8688-8693. doi: 10.1039/c7ra13601c. eCollection 2018 Feb 23.
Herein, we report a single nanofluorophore "off-on" probe based on the unique fluoride-boron interaction to achieve the visual determination of fluoride ions in environmental water. Red quantum dots (QDs) were modified using 3-aminophenylboronic acid (APBA) to form a stable standard emission probe, and reaction of the probe with catechol formed a five-membered cyclic borate ester, which led to the quenching of the fluorescence emission. The designed nanofluorophore probe showed a turn-on effect in the presence of fluoride ions due to the five-membered cyclic borate ester being transformed into a trifluoroborate, with breakage of the B-O bonds and removal of the catechol from the QDs. The prepared nanofluorophore probe displayed a high sensitivity for the quantification of fluoride ions with a naked eye visual detection limit of 0.4 μM, which was much lower than the US Environmental Protection Agency (EPA) defined limit (37 μM). Furthermore, the probe displayed an effective application for the detection of fluoride ions in environmental samples such as tap water and lake water. The very simple method reported here could be extended to the visual detection of a wide range of analysis assays in natural samples.
在此，我们报道了一种基于独特氟化物 - 硼相互作用的单一纳米荧光团“关 - 开”探针，用于实现环境水中氟离子的可视化测定。红色量子点（QDs）用3 - 氨基苯硼酸（APBA）进行修饰，形成稳定的标准发射探针，该探针与儿茶酚反应形成五元环硼酸酯，导致荧光发射猝灭。由于五元环硼酸酯转变为三氟硼酸盐，B - O键断裂且儿茶酚从量子点上脱离，所设计的纳米荧光团探针在氟离子存在下呈现开启效应。制备的纳米荧光团探针对氟离子定量具有高灵敏度，肉眼视觉检测限为0.4 μM，远低于美国环境保护局（EPA）规定的限值（37 μM）。此外，该探针在自来水和湖水等环境样品中氟离子的检测方面显示出有效应用。本文报道的这种非常简单的方法可扩展到天然样品中广泛分析测定的可视化检测。
