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Voltammetric study of the ion-exchange binding of non-electroactive metal cations to DNA-modified surfaces

机译:非电活性金属阳离子与DNA修饰表面的离子交换结合的伏安研究

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摘要

We describe a simple electrochemical protocol for studying the ion-exchange binding of non-electroactive ions, specifically mono-and divalent metal cations of biological relevance (Mg2+, Ca2+, and K+), to DNA-modified surfaces. After incubation in a dilute solution of multiply charged transition metal complex (5.0 mu M [Ru(NH3)(6)]Cl-3), gold electrodes modified with thiolate-DNA monolayers respond to the presence of these non-electroactive metal cations by producing significant changes in the cyclic voltammograms (i.e., decrease of the integrated charge and shift of formal potential) of the surface-bound redox complex ([Ru(NH3)(6)](3+)). The divalent cations (particularly Mg2+) can be detected at very low concentrations (<0 mu M), while the on-set value for K+ is substantially higher (50 mM). The equilibrium binding constants for Mg2+ and Ca2+ to DNA-modified surfaces were calculated.
机译:我们描述了一种简单的电化学协议,用于研究非电活性离子的离子交换结合,特别是具有生物相关性的单价和二价金属阳离子(Mg2 +,Ca2 +和K +)与DNA修饰的表面。在多电荷过渡金属络合物(5.0μM [Ru(NH3)(6)] Cl-3)的稀溶液中孵育后,用硫醇盐-DNA单层修饰的金电极通过以下方式响应这些非电活性金属阳离子的存在:产生表面结合的氧化还原络合物([Ru(NH3)(6)](3+))的循环伏安图的显着变化(即,积分电荷的减少和形式势的移动)。二价阳离子(尤其是Mg2 +)可以在非常低的浓度(<0μM)下检测到,而K +的起始值则要高得多(50 mM)。计算了Mg2 +和Ca2 +与DNA修饰表面的平衡结合常数。

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