首页> 外文期刊>Bulletin of the Korean Chemical Society >SAMs of 2-Aminoethanethiol Modified with 3,4-Dihydroxyphenylalanine for the Electrocatalytic Oxidation of NADH on Gold Electrodes
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SAMs of 2-Aminoethanethiol Modified with 3,4-Dihydroxyphenylalanine for the Electrocatalytic Oxidation of NADH on Gold Electrodes

机译:3,4-二羟基苯丙氨酸修饰的2-氨基乙硫醇的SAMs在金电极上对NADH的电催化氧化

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摘要

2-Aminoethanethiol (aet) has been used to make self-assembled monolayer (SAMs) on gold electrodes,which are subsequently modified with 3,4-dihydroxy phenylalanine (dpa).Such modified electrodes having various types of Au/aet-dpa were employed in the electrocatalytic oxidation of NADH.The purpose of this study to characterize the responses of such modified electrodes in terms of the immobilization procedure,pH of the solution and applied potential.The reaction of the surface immobilized dpa with NADH was studied using the rotating disk electrode technique and a value of 2.2X10~4 M~(-1)s~(-1) was obtained for the second-order rate constant in 0.1 M Tris/NO_3~- buffer (pH=8.0).The hydration behavior of the films was characterized by quartz crystal microbalance.When used as a NADH sensor,the Au/aet-dpa electrode exhibited good sensitivity and an excellent correlation (r>=0.99) for NADH concentration which extended to 3.8X10~(-3) M.
机译:2-氨基乙硫醇(aet)已用于在金电极上制备自组装单分子膜(SAMs),随后将其用3,4-二羟基苯丙氨酸(dpa)改性。本研究旨在通过固定程序,溶液的pH值和施加电势来表征此类修饰电极的响应。通过旋转研究了固定化dpa与NADH的反应。圆盘电极技术,在0.1 M Tris / NO_3〜-缓冲液(pH = 8.0)中的二级速率常数为2.2X10〜4 M〜(-1)s〜(-1)。用作NADH传感器时,Au / aet-dpa电极表现出良好的灵敏度,并且对NADH浓度具有极好的相关性(r> = 0.99),延伸至3.8X10〜(-3) M.

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