A simple coumarin-based fluorescent probe for specific detection of cysteine over homocysteine and glutathione
作者:Haixia Qiao、Yali Meng、Yanxia Zhang、Jiaxing Sun、Tao Wang、Xiaojie Zhang、Feifan Wang、Yan-Fei Kang
DOI:10.1007/s11696-018-0401-2
日期:2018.6
In this work, we designed and synthesized 3-cyano-2-oxo-2H-chromen-7-yl acrylate as a simple and effective probe 1, which is capable of detecting cysteine (Cys) over other biothiols, such as homocysteine and glutathione. Remarkably, with the addition of cysteine, the 125-fold increase in fluorescence intensity of probe 1 was observed at 450 nm with excitation at 413 nm and 5 min incubation time. Furthermore, it is more important that probe 1 possesses the detection limit of 80 nM, and there is good linear relationship between fluorescence intensity and concentration of Cys from 0 to 100 μM. Thus, these made a powerful safeguard for the detection of Cys in the biological system. Simultaneously, probe 1 showed low toxicity and could be used in living cell imaging.
在这项工作中,我们设计并合成了3-氰基-2-氧代-2H-香豆素-7-基丙烯酸酯作为一个简单有效的探针1,该探针能够选择性地检测半胱氨酸(Cys),而对其他生物硫醇(如同型半胱氨酸和谷胱甘肽)则表现出较低的反应。值得注意的是,随着半胱氨酸的加入,在413 nm激发下,探针1在450 nm处的荧光强度增加了125倍,且仅需5分钟的孵育时间。此外,更重要的是,探针1的检测限为80 nM,并且在0到100 μM的半胱氨酸浓度范围内,荧光强度与浓度之间呈良好的线性关系。因此,这为在生物系统中检测半胱氨酸提供了强有力的保障。同时,探针1表现出低毒性,可以用于活细胞成像。