A novel 4-hydroxypyrene-based “off–on” fluorescent probe with large Stokes shift for detecting cysteine and its application in living cells
作者:Wenhao Sun、Xinxue Tang、Jingyang Li、Menglu He、Ran Zhang、Xiang'en Han、Yun Zhao、Zhonghai Ni
DOI:10.1016/j.tetlet.2019.151467
日期:2020.2
4-acrylatepyrene (PYAC) based on 4-hydroxypyrene, which can effectively detect cysteine (Cys). The probe PYAC uses acrylate moiety as a recognition site and has relatively high selectivity and sensitivity for Cys with the detection limit of 0.062 μM. After treatment with Cys, PYAC exhibits “off-on” switching property and large Stokes shift (171 nm). Due to nucleophilic addition and specific intramolecular cyclization
本文报道了一种新型的基于4-羟基py的荧光探针4-丙烯酸py(PYAC),它可以有效地检测半胱氨酸(Cys)。探针PYAC使用丙烯酸酯部分作为识别位点,对Cys具有相对较高的选择性和灵敏度,检测极限为0.062μM。用Cys,PYAC治疗后具有“关断”开关性能和较大的斯托克斯位移(171 nm)。由于亲核加成和特定的分子内环化作用,与其他氨基酸和常见离子(包括高半胱氨酸(Hcy)和谷胱甘肽(GSH)具有与Cys相似的结构)相比,它对Cys的选择性更高。识别机制已通过高效液相色谱(HPLC)和核磁共振波谱(1 H NMR)进行了表征。抗干扰测试和pH影响测试显示,它适用于检测活细胞中的Cys。最终,探针PYAC已成功应用于细胞毒性可忽略不计的细胞成像。