Two-Photon Ratiometric Fluorescence Probe with Enhanced Absorption Cross Section for Imaging and Biosensing of Zinc Ions in Hippocampal Tissue and Zebrafish
作者:Wanying Li、Bingqing Fang、Ming Jin、Yang Tian
DOI:10.1021/acs.analchem.6b04781
日期:2017.2.21
hippocampal tissue, and zebrafish. The developed probe demonstrated high two-photon absorption cross section (δ) of 516 ± 77 GM, which increased to 958 ± 144 GM after the probe was coordinated with Zn2+. Furthermore, this P–Zn probe quickly recognized Zn2+ with high selectivity, over other metal ions, amino acids, and reactive oxygen species. More interestingly, the initial emission peak of the present probe
锌离子(Zn 2+)不仅在蛋白质的结构,催化,转录和调节中起重要作用,而且还是调节脑神经递质通过过程的重要离子信号。在这项工作中,我们设计并合成了一种基于分子内电荷转移的比率式双光子荧光探针P-Zn,用于活细胞,海马组织和斑马鱼中Zn 2+的成像和生物传感。所开发的探针显示出高的双光子吸收截面(δ),为516±77 GM,在与Zn 2+配位后,增加到958±144 GM 。此外,该P–Zn探针可快速识别Zn 2+具有比其他金属离子,氨基酸和活性氧更高的选择性。更有趣的是,本探针在465 nm处的初始发射峰减小,而在550 nm处的新峰增加,从而可以高精度地定量测定Zn 2+。最后,这种具有高时间分辨率和出色分析性能以及低细胞毒性的双光子荧光探针已成功应用于活细胞,海马组织和斑马鱼的成像。目前的P–Zn探针与FLIM结合可在单细胞水平上准确绘制Zn 2+分布。更有趣的是,双光子光谱结果表明Zn