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首页> 外文期刊>Electroanalysis >Photoelectrocatalytic Oxidation of NADH at a Graphite Electrode Modified with a New Polymeric Phenothiazine
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Photoelectrocatalytic Oxidation of NADH at a Graphite Electrode Modified with a New Polymeric Phenothiazine

机译：新型高分子吩噻嗪修饰石墨电极对NADH的光电催化氧化

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摘要

A new approach for photoelectrocatalytic oxidation of NADH is described, based on a graphite electrode (G) modified with a new phenothiazine derivative, polyphenothiazine formaldehyde (PPF). Electrochemical measurements reveal that G/PPF presents a quasireversible voltammetric response, corresponding to a 2e(-)/2H(+) transfer and that G/PPF modified electrodes show electrocatalytic activity for NADH oxidation. When the surface of the G/PPF modified electrode was irradiated with a light source (250 W Halogen lamp), a significant increase in the electrocatalytic current was observed. The second order electrocatalytic rate constant (k(obs,[NADH]=0) = 3.9 x 10(3) M-1 s(-1), pH 7.0) was calculated from rotating disk electrode experiments, performed at various NADH concentrations. From amperometric measurements, it was noticed that, in the presence of light irradiation, the sensitivity of NADH detection (calculated as I-max/K-M ratio) increased ca. 3 times.
机译：描述了一种新的NADH光电催化氧化方法，该方法基于用新的吩噻嗪衍生物，聚吩噻嗪甲醛（PPF）改性的石墨电极（G）。电化学测量表明，G / PPF呈现出准可逆的伏安响应，对应于2e（-）/ 2H（+）转移，并且G / PPF修饰的电极显示出对NADH氧化的电催化活性。当用光源（250 W卤素灯）照射G / PPF修饰电极的表面时，观察到电催化电流显着增加。由旋转盘电极实验在不同的NADH浓度下计算出二级电催化速率常数（k（obs，[NADH] = 0）= 3.9 x 10（3）M-1 s（-1），pH 7.0）。从安培测量中，注意到在存在光辐射的情况下，NADH检测的灵敏度（以I-max / K-M比计算）大约增加了。 3次。

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