X-ray structurally characterized quinoline based fluorescent probes for pH sensing: Application in intracellular pH imaging; DFT calculations and fluorescent labelling
作者:Subhajit Guria、Avijit Ghosh、Tanushree Mishra、Manas kumar Das、Arghya Adhikary、Susanta Adhikari
DOI:10.1016/j.jphotochem.2020.113074
日期:2021.2
Quinoline based fluorescent probes QNOH-MO and QNOH-OME were synthesized, and their photo-physical properties were carefully investigated. The probes were well characterized by 1H-NMR, 13C-NMR, ESI-MS, and single-crystal X-ray structure analysis. QNOH-MO and QNOH-OME can identify small changes in pH by colorimetric and fluorescence methods. In low pH range, these probes display a red fluorescence in
合成了基于喹啉的荧光探针QNOH-MO和QNOH-OME,并对其光物理性质进行了仔细研究。通过1 H-NMR,13 C-NMR,ESI-MS和单晶X射线结构分析对探针进行了很好的表征。QNOH-MO和QNOH-OME可以通过比色法和荧光法鉴定pH的微小变化。在低pH范围内,这些探针在活细胞和固定细胞中均显示红色荧光。但是,随着pH值的增加,观察到的红色荧光减少,绿色荧光同时增加。理论计算和1很好地支持了pH依赖的从红色荧光到绿色荧光的转换。1 H NMR滴定实验。此外,还详细研究了这些探针在活细胞中成像pH变化的能力。此外,QNOH-OME已成功用于胆固醇分子的荧光标记,胆固醇分子是生物膜的重要组成部分,并用于脂质体制剂中,用于药物输送。另外,QNOH-MO被季铵化以诱导分子的固有阳离子性质。阳离子探针QNOH-MO-CA表现出改善的水溶性和pH感测效率。