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首页> 外文期刊>Electroanalysis >Investigation of a DNA-Based Biosensor with Chitosan-Carbon Nanotubes Interface by Cyclic and Elimination Voltammetry
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Investigation of a DNA-Based Biosensor with Chitosan-Carbon Nanotubes Interface by Cyclic and Elimination Voltammetry

机译：壳聚糖-碳纳米管接口的基于DNA的生物传感器的循环和消除伏安法研究。

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The paper presents a disposable DNA biosensor based on a composite of multiwalled carbon nanotubes (MWCNT) in chitosan (CHIT) used as an interface at the screen printed carbon electrode (SPCE). Double stranded herring sperm DNA was immobilized over the MWCNT-CHIT layer. The response of the modified SPCE with and without DNA was characterized using the redox probe [Fe(CN)(6)](3-/4-) in the mode of cyclic voltammetry and elimination voltammetry with linear scan (EVLS), which enables the elimination of selected partial voltammetric currents contributing to the total current. The elimination functions providing a significant increase in the voltammetric current sensitivity and improving the peak resolution enable to indicate an adsorbed state of depolarizers, to discover hidden electrode processes, and to determine their nature. ne SPCE surface modification was evaluated using (a) the charge transfer coefficient a of the redox probe calculated from the Tafel plot analysis (TPA) and EVLS and (b) the polarization resistance R-p for both cathodic and anodic processes.
机译：该论文提出了一种基于脱乙酰壳多糖（CHIT）中的多壁碳纳米管（MWCNT）复合物的一次性DNA生物传感器，该复合物用作丝网印刷碳电极（SPCE）的界面。将双链鲱鱼精子DNA固定在MWCNT-CHIT层上。使用氧化还原探针[Fe（CN）（6）]（3- / 4-），以循环伏安法和线性扫描消除伏安法（EVLS）表征了修饰的SPCE在有无DNA的情况下的响应。消除对总电流有贡献的部分伏安电流。消除功能提供了伏安电流灵敏度的显着提高并提高了峰分辨率，从而能够指示去极化器的吸附状态，发现隐藏的电极过程并确定其性质。使用（a）通过Tafel图分析（TPA）和EVLS计算的氧化还原探针的电荷转移系数a和（b）阴极和阳极过程的极化电阻R-p评估SPCE的表面改性。

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