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Construction of manganese oxide nanowire-like cluster arrays on a DNA template: Application to detection of hydrogen peroxide.
Bioelectrochemistry ( IF 4.8 ) Pub Date : 2019-12-02 , DOI: 10.1016/j.bioelechem.2019.107419
Nader Amini 1 , Mojtaba Shamsipur 2 , Afshin Maleki 1
Affiliation  

Improved electron transfer properties and catalytic activity of manganese oxide (MnOx) was demonstrated following its electrochemical deposition on a deoxyribonucleic acid (DNA) modified glassy carbon electrode. The MnOx showed different morphologies, electrocatalytic properties and electrochemical kinetics. Scanning electron microscopy showed that electrodeposition of MnOx on a bare glassy carbon electrode led to the formation of irregular-shapes while a nanowire cluster (NWC) was formed on a GCE/DNA due to the DNA serving as a template. Electrochemical impedance spectroscopy (EIS) revealed lower charge transfer resistance of the MnOxNWC compared with MnOx. A new mechanism is presented for the electrodeposition of MnOx on the surface of a GC/DNA electrode. An electrochemical biosensor was fabricated based on depositing MnOx onto a glassy carbon /DNA electrode (GCE/DNA/MnOxNWC) and was used to detect hydrogen peroxide (H2O2). The MnOx nanowire cluster and DNA exhibited significant electrocatalytic activity for simultaneous electrocatalytic oxidation at two oxidation potentials (0.6 V and 0.98 V vs Ag/AgCl) and one reduction potential (-0.5 V vs Ag/AgCl) for H2O2 at pH 6.0. A new mechanism for the detection of H2O2 is presented. Excellent electrocatalytic activity, stability and facility for simultaneous detection of H2O2 at different of applied potentials are proposed advantages of the proposed electrochemical biosensor.

中文翻译:

在DNA模板上构建氧化锰纳米线状簇阵列:在过氧化氢检测中的应用。

在氧化锰(DNA)修饰的玻碳电极上进行电化学沉积后,证明了锰氧化物(MnOx)的改进的电子转移性能和催化活性。MnOx表现出不同的形态,电催化性能和电化学动力学。扫描电子显微镜显示,MnOx在裸露的玻璃碳电极上的电沉积导致形成不规则形状,而由于DNA作为模板,在GCE / DNA上形成了纳米线簇(NWC)。电化学阻抗谱(EIS)显示,与MnOx相比,MnOxNWC的电荷转移电阻更低。提出了一种新的机制,用于在GC / DNA电极表面上电沉积MnOx。基于将MnOx沉积到玻璃碳/ DNA电极(GCE / DNA / MnOxNWC)上,制造了电化学生物传感器,并将其用于检测过氧化氢(H2O2)。MnOx纳米线簇和DNA在pH 6.0的H2O2的两个氧化电势(0.6 V和0.98 V对Ag / AgCl)和一个还原电势(-0.5 V对Ag / AgCl)的同时电催化氧化中显示出显着的电催化活性。提出了一种检测H2O2的新机制。提出的电化学生物传感器的优点是具有优异的电催化活性,稳定性和在不同的施加电势下同时检测H2O2的便利性。MnOx纳米线簇和DNA在pH 6.0的H2O2的两个氧化电势(0.6 V和0.98 V对Ag / AgCl)和一个还原电势(-0.5 V对Ag / AgCl)的同时电催化氧化中显示出显着的电催化活性。提出了一种检测H2O2的新机制。提出的电化学生物传感器的优点是具有优异的电催化活性,稳定性和在不同的施加电势下同时检测H2O2的便利性。MnOx纳米线簇和DNA在pH 6.0的H2O2的两个氧化电位(0.6 V和0.98 V vs Ag / AgCl)和一个还原电位(-0.5 V vs Ag / AgCl)下显示出显着的电催化活性,可同时进行电催化氧化。提出了一种检测H2O2的新机制。提出的电化学生物传感器的优点是具有优异的电催化活性,稳定性和在不同的施加电势下同时检测H2O2的便利性。
更新日期:2019-12-02
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