the cytosol, in marked contrast to our previously reported Ca2+ far‐red to NIR fluorescence probe based on the SiR scaffold, CaSiR‐1 AM, which is mainly localized in lysosomes as well as cytosol in living cells. CaPR‐1 showed longer‐wavelength absorption and emission (up to 712 nm) than CaSiR‐1. The new probe was able to image Ca2+ at dendrites and spines in brain slices, and should be a useful tool
近红外(NIR)区域(650–900 nm)的
荧光成像可用于
生物成像,因为在此范围内背景自发荧光低且组织穿透率高。此外,NIR荧光可用作多色成像的绿色和红色的互补色窗口。在这里,我们比较了
硅和
磷取代的
罗丹明(SiRs和PRs)的光诱导电子转移(PeT)介导的荧光猝灭,以指导改进的远红外至NIR荧光
染料的开发。一系列新合成的PR的密度泛函理论计算和光物理评估的结果证实,与SiRs相比,PRs的荧光更容易通过PeT猝灭。在此基础上,我们设计并合成了用于Ca 2+的NIR荧光探针,CaPR-1及其膜渗透性乙酰氧甲基衍
生物CaPR-1
AM分布在细胞质中,这与我们先前报道的基于SiR支架CaSiR-的Ca 2+远红外NIR荧光探针形成鲜明对比1
AM,主要位于溶酶体以及活细胞的胞浆中。CAPR-1显示出更长波长的吸收和发射(高达712纳米)比CaSiR-1 。新的探针能够在脑切片的树突和棘上成像Ca