Colorimetric and Ratiometric Fluorescent Chemosensor Based on Diketopyrrolopyrrole for Selective Detection of Thiols: An Experimental and Theoretical Study
作者:Ling Deng、Wenting Wu、Huimin Guo、Jianzhang Zhao、Shaomin Ji、Xin Zhang、Xiaolin Yuan、Chunlei Zhang
DOI:10.1021/jo201487m
日期:2011.11.18
the intracellular thiols, signal can only be detected through the red channel; thus, ratiometric bioimaging of intracellular thiols was achieved. The ratiometric response of probe 1 was rationalized by DFT calculations. Our complementary experimental and theoretical studies will be useful for design of ratiometric/colorimetric molecular probes.
用二酮吡咯并吡咯(DPP)荧光团设计了比色和比例荧光硫醇探针。探针分别在523和666 nm处产生吸收和发射。在巯基(例如半胱氨酸)存在下,吸收带和发射带分别移至479和540 nm。相应地,探针溶液的颜色从紫色变为黄色,并且荧光从红色变为黄色。540 nm处的发射强度提高了140倍。探针1的斯托克斯位移(107 nm)比未取代的DPP荧光团(56 nm)大得多。质谱分析表明,除了预期的硫醇的迈克尔加成到C═C键外,丙二腈部分的CN基团还与硫醇反应形成4,5-二氢噻唑结构。探测图1用于细胞内硫醇的荧光成像。在存在硫醇的情况下,显微镜的绿色和红色通道均处于活动状态。随着细胞内硫醇的去除,只能通过红色通道检测到信号。因此,实现了细胞内硫醇的比例生物成像。通过DFT计算合理化了探针1的比例响应。我们的补充实验和理论研究将对比率/比色分子探针的设计有用。