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Building highly sensitive dye assemblies for biosensing from molecular building blocks

机译:构建用于生物传感的高度敏感的染料组件 分子构件

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摘要

Fluorescence superquenching is investigated for polyelectrolytes consisting of cyanine dye pendant polylysines ranging in number of polymer repeat units (NPRU) from 1 to 900, both in solution and after adsorption onto silica nanoparticles. As NPRU increases, the absorption and fluorescence evolve from monomer spectra to red-shifted features indicative of molecular J aggregates. In solution, the superquenching sensitivity toward an anionic electron acceptor increases by more than a millionfold over the NPRU range from 1 to 900. The dramatic increase is attributed to enhanced equilibrium constants for binding the quenchers, and the amplified quenching of a delocalized exciton of ≈100 polymer repeat units. The self-assembly of monomer onto silica and clay nanoparticles leads to formation of J aggregates, and surface-activated superquenching enhanced 10,000× over the monomer in solution, indicating the formation of “self-assembled polymers” on the nanoparticle surface. Utilization of these self-assembled polymers as high-sensitivity biosensors is demonstrated.
机译:研究了在溶液中以及吸附到二氧化硅纳米颗粒上后,由花菁染料侧基聚赖氨酸组成的多电解质的荧光超猝灭,该多聚赖氨酸的聚合物重复单元数(NPRU)为1至900。随着NPRU的增加,吸收和荧光从单体光谱演变为指示分子J聚集体的红移特征。在溶液中,对阴离子电子受体的超猝灭敏感性在NPRU范围(从1到900)范围内增加了超过一百万倍。戏剧性的增加归因于增强与猝灭剂结合的平衡常数,以及离域激子的放大猝灭。 100个聚合物重复单元。单体在二氧化硅和粘土纳米粒子上的自组装导致J聚集体的形成,并且表面活化的超猝灭作用比溶液中的单体高10,000倍,表明在纳米粒子表面形成了“自组装聚合物”。这些自组装聚合物作为高灵敏度生物传感器的应用已得到证明。

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