β-cyclodextrin was evaluated and applied to cell imaging. Probe PM-A had no fluorescence in water, but had obvious fluorescence signal in β-cyclodextrin solution. With the addition of β-cyclodextrin (0–800 eq), the fluorescence quantum yield of PM-A increased from 0% to 45%. Laser confocal experiments showed that when only PM-A was added, the probe concentration needed to be 15 μM to image the cell membrane
本文将
恶唑吡啶与
香豆素单元结合,通过羟醛缩合反应制备细胞膜荧光探针(PM-A )。PM-A具有长波长发射(665-739 nm)、高摩尔消光系数(约 3.14 × 10 4 M -1 cm -1 )和大斯托克斯位移(150-219 nm)。光稳定性测试表明,在连续光照 6 小时后, PM-A具有较高的相对残余吸收(93%)。此外,还评估了PM-A和 β-
环糊精之间的超分子相互作用并将其应用于细胞成像。探头PM-A在
水中无荧光,但在β-
环糊精溶液中有明显的荧光信号。随着β-
环糊精(0-800 eq)的加入,PM-A的荧光量子产率从 0% 增加到 45%。激光共聚焦实验表明,仅添加PM-A时,需要 15 μM 的探针浓度才能使细胞膜清晰成像。与之形成鲜明对比的是,在β-
环糊精溶液的帮助下,探针PM-A的浓度仅需0.5 μM即可快速、高特异性地成像细胞膜。此外,PM-A在加入β-
环糊精后具有较