A new and simple chemodosimetric probe L11 is utilized for the selective detection of biothiols in the presence of other relevant amino acids under physiological conditions (pH = 7.4). This eventually led to a turn-off luminescence response due to an effective photoinduced electron transfer based signaling mechanism. A comparison of the results of the fluorescence kinetic analysis and 1H NMR studies of the reaction between thiol and L11 or the analogous compound L22 revealed the role of intramolecular hydrogen bonding in activating the imine functionality towards nucleophilic addition. Such an example is not common in contemporary literature. Conventional MTT assay studies revealed that this probe (L11) has low cytotoxicity. Results of the cell imaging studies revealed that this probe was cell membrane permeable and could detect the intracellular distribution of biothiols within living HeLa cells. Furthermore, our studies with human blood plasma demonstrated the possibility of using this reagent for the quantitative optical detection of total biothiols in biological fluid. Such an example for the detection of biothiols in real biological samples is rare in the contemporary literature. These results clearly demonstrate the possibility of using this reagent in medicinal biology and diagnostic applications.
在生理条件(pH=7.4)下,利用一种新的简单
化学计量探针 L11,在存在其他相关
氨基酸的情况下选择性地检测
生物硫醇。通过有效的光诱导电子传递信号机制,最终产生了熄灭发光反应。通过比较
硫醇与 L11 或类似化合物
L22 反应的荧光动力学分析结果和 1H NMR 研究结果,发现了分子内
氢键在激活
亚胺官能团亲核加成中的作用。这样的例子在当代文献中并不常见。传统的 M
TT 检测研究表明,这种探针(L11)的细胞毒性较低。细胞成像研究结果表明,这种探针具有细胞膜渗透性,可以检测
生物硫醇在活体 HeLa 细胞内的分布。此外,我们对人体血浆的研究表明,这种试剂可用于定量光学检测
生物液体中的总
生物硫醇。这种在真实
生物样本中检测
生物硫醇的实例在当代文献中十分罕见。这些结果清楚地证明了将这种试剂用于医药
生物学和诊断应用的可能性。