Preparation of a Novel pH-responsive Fluorescent Probe Based on an Imidazo[1,2-a]indole Fluorophore and its Application in Detecting Extremely Low pH in Saccharomyces cerevisiae
作者:Yanhao Xu、Ruikang Duan、Hao Liu、Chengcai Xia、Guiyun Duan、Yanqing Ge
DOI:10.1007/s10895-021-02739-8
日期:2021.9
A novel pH-responsive probe based on an imidazo[1,2-a]indole fluorophore architecture is reported. The probe was highly selective to strongly acidic pH (pKa = 3.56) with high sensitivity and a fast response time (within 30 s). The probe did not demonstrate any fluorescence changes in the presence of interfering metal ions, and it featured excellent reversibility under strongly acidic conditions. The mechanism of detection of the probe was determined to be based on intramolecular charge transfer (ICT) at different pH. The probe was also able to be used for imaging for detecting acidic pH in Saccharomyces cerevisiae.
本文报道了一种基于咪唑并[1,2-a]吲哚荧光结构的新型pH响应探针。该探针对强酸性pH(pKa = 3.56)具有高度选择性,灵敏度高,响应速度快(30秒内)。在干扰金属离子存在的情况下,该探针未显示出任何荧光变化,并且在强酸性条件下具有优异的可逆性。该探针的检测机制被确定为基于不同pH下的分子内电荷转移(ICT)。该探针还可用于成像,以检测酿酒酵母中的酸性pH。