A new colorimetric and fluorescence probe NRSH based on Nile-red chromophore for the detection of biothiols has been developed, exhibiting high selectivity towards biothiols over other interfering species. NRSH shows a blue shift in absorption peak upon reacting with biothiols, from 587 nm to 567 nm, which induces an obvious color change from blue to pink and exhibits a 35-fold fluorescence enhancement at 645 nm in red emission range. NRSH displays rapid (<1 min) response for H2S, which is faster than other biothiols (>5 min). The detection limits of probe NRSH towards biothiols are very low (22.05 nM for H2S, 34.04 nM for Cys, 107.28 nM for GSH and 113.65 nM for Hcy). Furthermore, NRSH is low cytotoxic and can be successfully applied as a bioimaging tool for real-time monitoring biothiols in HeLa cells. In addition, fluorescence mechanism of probe NRSH is further understood by theoretical calculations.
基于尼罗红色团的新型比色和荧光探针NRSH已开发出来,用于生物硫醇的检测,对生物硫醇具有高选择性,而对其他干扰物质则不敏感。NRSH在与生物硫醇反应后,吸收峰向蓝色移动,从587nm到567nm,引起明显的颜色变化,从蓝色变为粉红色,并在红色发射范围内的645nm处展现35倍的荧光增强。NRSH对H2S的响应速度快(<1分钟),比其他生物硫醇(>5分钟)更快。探针NRSH对生物硫醇的检测限非常低(H2S 22.05nM,Cys 34.04nM,GSH 107.28nM和Hcy 113.65nM)。此外,NRSH细胞毒性低,可成功应用于HeLa细胞中实时监测生物硫醇的生物成像工具。此外,通过理论计算,进一步了解了探针NRSH的荧光机制。