Electrochemical Behaviour of Microwave‐assisted Oxidized MWCNTs Based Disposable Electrodes: Proposal of a NADH Electrochemical Sensor,Electroanalysis

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Electrochemical Behaviour of Microwave‐assisted Oxidized MWCNTs Based Disposable Electrodes: Proposal of a NADH Electrochemical Sensor
Electroanalysis ( IF 2.7 ) Pub Date : 2018-01-16 , DOI: 10.1002/elan.201700674
Lucas Blandón-Naranjo ₁ , Flavio Della Pelle ₂ , Mario V. Vázquez ₁ , Jaime Gallego ₃ , Alexander Santamaría ₃ , Manuela Alzate-Tobón ₃ , Dario Compagnone ₂

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The effect of the oxidation degree of multiwalled carbon nanotubes (MWCNTs) for the detection of NADH was evaluated in this paper. MWCNTs were oxidized by microwave‐assisted sulfonitic treatment at different times (5, 10, 15, and 30 min) and deposited onto a graphite screen printed electrodes. Oxidized MWCNTs were characterized and the electrochemical performance evaluated. The best sensor in terms of sensitivity and stability was obtained after 15 minutes of oxidation (SPE/CNT15). A significant reduction of the NADH oxidation potential was recorded for oxidized MWCNTs compared with unmodified MWCNTs (0.270 V and 0.500 V, respectively vs. Ag/AgCl pseudo reference electrode), increasing the selectivity of the system. Chronoamperometric calibration curves carried out applying a potential of 0.3 V for 1 min were linear in the 4–35 μM range of NADH. A limit of detection of 1 μM was achieved with negligible surface fouling (three consecutive calibration curves, 30 total measurements: slope decrease 5.9 %). Inter electrode reproducibility (n=13) was good resulting in RSD of 15.2 % and 5.0 % for the peak intensity and the oxidation potential, respectively. Quantification of glucose in white wine samples was carried out to demonstrate the ability of the NADH sensor to work in real samples. A good correlation with a spectrophotometric kit for the glucose quantification was achieved.

中文翻译：

微波辅助氧化MWCNTs一次性电极的电化学行为：NADH电化学传感器的建议

评估了多壁碳纳米管（MWCNTs）的氧化度对检测NADH的影响。在不同时间（5、10、15和30分钟），通过微波辅助的亚磺酸处理将MWCNT氧化，并沉积在石墨丝网印刷电极上。表征了氧化的碳纳米管，并评估了电化学性能。经过15分钟的氧化（SPE / CNT15），可获得灵敏度和稳定性最佳的传感器。与未修饰的MWCNT相比，氧化的MWCNT的NADH氧化电位显着降低（相对于Ag / AgCl伪参比电极，分别为0.270 V和0.500 V），从而增加了系统的选择性。在NADH的4–35μM范围内，施加0.3 V电位1分钟进行的计时安培校准曲线是线性的。表面污垢可忽略不计，检测限为1μM（3条连续的校准曲线，共30次测量：斜率降低5.9％）。电极间重现性良好（n = 13），峰强度和氧化电位的RSD分别为15.2％和5.0％。对白葡萄酒样品中的葡萄糖进行了定量分析，以证明NADH传感器在实际样品中起作用的能力。与用于葡萄糖定量的分光光度法试剂盒实现了良好的相关性。对白葡萄酒样品中的葡萄糖进行了定量分析，以证明NADH传感器在实际样品中起作用的能力。与用于葡萄糖定量的分光光度法试剂盒实现了良好的相关性。对白葡萄酒样品中的葡萄糖进行了定量分析，以证明NADH传感器在实际样品中起作用的能力。与用于葡萄糖定量的分光光度法试剂盒实现了良好的相关性。

更新日期：2018-01-16

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