Cell penetrating silica nanoparticles doped with two-photon absorbing fluorophores
作者:Loris Bertazza、Lucia Celotti、Graziano Fabbrini、Maria Antonietta Loi、Michele Maggini、Fabrizio Mancin、Silvia Marcuz、Enzo Menna、Michele Muccini、Umberto Tonellato
DOI:10.1016/j.tet.2006.08.044
日期:2006.10
absorbing distyrylbenzene derivatives, were prepared and studied as cell staining agents. Two dyes were used, bearing either two peripheral dimethylamino groups or one dimethylamino and one cyano group. Due to the internal charge transfer character of their excited state, the dyes employed show a red-shifted quenched emission in polar solvents. Once included in the particles, the properties of the two dyes
制备了掺有吸收了两个光子的二苯乙烯基苯衍生物的有机硅纳米粒子,并将其作为细胞染色剂进行了研究。使用两种染料,带有两个外围二甲基氨基基团或一个二甲基氨基基团和一个氰基基团。由于其激发态的内部电荷转移特性,所用染料在极性溶剂中显示出红移的猝灭发射。一旦包含在颗粒中,两种染料的性质就会发生很大的变化。掺杂有氰基取代的二苯乙烯基苯的颗粒在水中显示出显着的发射量子产率,这可能是由于溶剂从纳米颗粒核中排除。相反,含有被两个二甲基氨基取代的染料的颗粒的发射基本上被猝灭。由双光子吸收引起的荧光发射遵循相同的行为。掺杂的纳米颗粒可以被肿瘤细胞快速内在化,其积累仅限于细胞质,并且在低浓度下无细胞毒性。