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现场圆二色薄层光谱电化学研究去甲肾上腺素的电化学氧化还原过程 .研究表明去甲肾上腺素 ( pH =7.0磷酸缓冲溶液中 )在玻碳电极上经历了不可逆的电化学氧化 ,且遵从后行化学反应 (EC)机理 ,去甲肾上腺素醌和去甲肾上腺素红的再还原遵从简单电子转移 (E)机理 .由双对数法获得去甲肾上腺素电化学氧化的式电位为E10’=0 .2 0V ,电子转移系数和电子转移数之积为αn =0 .38,标准复相电极反应常数k10 =1 .2× 1 0 -4 cm·s-1.去甲肾上腺素醌和去甲肾上腺素红的电化学还原反应参数分别为E2 0’=0 .2 5V ,αn =0 .37,k2 0 =4.4× 1 0 -5 cm·s-1和E3 0’=- 0 .2 5V ,αn =0 .33,k3 0 =1 .1× 1 0 -4 cm·s-1.
Electrochemical redox processes of norepinephrine were studied by on-site circular dichroic thin-film spectroscopic electrochemical studies. The results show that norepinephrine (pH = 7.0 in phosphate buffered solution) undergoes irreversible electrochemical oxidation at the glassy carbon electrode and In accordance with the mechanism of the postreaction chemical reaction (EC), the re-reduction of norepinephrinequinone and noradrenaline red follows the simple electron transfer (E) mechanism.The electropotential of noradrenaline electrochemical oxidation obtained by the double logarithm method is E10 ’= 0.20V, the product of the electron transfer coefficient and the electron transfer number is αn = 0.38, and the standard complex electrode reaction constant k10 = 1.2 × 10 -4 cm · s -1. The norepinephrine The electrochemical reduction parameters of quinone and noradrenaline red were E2 0 ’= 0.2V, αn = 0.37, k2 0 = 4.4 × 10 -5 cm · s -1 and E 3 0’ = - 0 .2 5V, αn = 0 .33, k3 0 = 1 .1 × 10 -4 cm · s-1.