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Transition metal induced switch of fluorescence and absorption response of a Zn(II)porphyrin-DNA conjugate to cysteine derivatives

机译:过渡金属诱导的Zn(II)卟啉-DNA缀合物对半胱氨酸衍生物的荧光和吸收响应的转换

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摘要

We report a supramolecular zinc(II) tetraarylporphyrin-oligothymidine/metal ion system (ZnPorT8/M2+) for dual optical sensing of cysteine (Cys) and glutathione (GSH) with a tunable spectroscopic outcome. Transition metal ions (M2+ = Hg2+ or Cu2+) allow the switching of the emission and absorption response of the ZnPorT8/M2+ complex. The ZnPorT8/Hg2+ complex exhibits turn-on fluorescence sensing (fluorescence enhancement), whilst the ZnPorT8/Cu2+ system exhibits turn-off sensing (emission quenching) of Cys and GSH. The ZnPorT8/Hg2+ and ZnPorT8/Cu2+ complexes have an excellent limit of detection (LOD(em)) for Cys (5.95 nM and 11.99 nM, respectively) and GSH (3.34 nM and 13.50 nM, respectively).
机译:我们报告超分子锌(II)四芳基卟啉-寡胸苷/金属离子系统(ZnPorT8 / M2 +)对半胱氨酸(Cys)和谷胱甘肽(GSH)的双重光学传感,具有可调光谱结果。过渡金属离子(M2 + = Hg2 +或Cu2 +)可以切换ZnPorT8 / M2 +络合物的发射和吸收响应。 ZnPorT8 / Hg2 +复合物表现出开启的荧光感应(荧光增强),而ZnPorT8 / Cu2 +系统表现出Cys和GSH的关闭感应(发射猝灭)。 ZnPorT8 / Hg2 +和ZnPorT8 / Cu2 +复合物对于Cys(分别为5.95 nM和11.99 nM)和GSH(分别为3.34 nM和13.50 nM)具有极好的检测限(LOD(em))。

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