多巴胺在聚L-半胱氨酸/多壁碳纳米管修饰电极上的电化学行为及其伏安测定  

Electrochemical Behavior of Dopamine at Poly(L-cysteine)/Mutil-walled Carbon Nanotube Modified Electrode and Its Voltammetric Determination

作　　者：马曾燕[1] 李将渊[1] 向伟[1] 

机构地区：[1]化学应用与污染控制技术四川省重点实验室,西华师范大学化学化工学院,南充637002

出　　处：《应用化学》2009年第2期224-228,共5页Chinese Journal of Applied Chemistry

基　　金：四川省教育厅重点科研基金(2004A106)资助项目

摘　　要：以多壁碳纳米管(MWNT)作为掺杂剂,在玻碳电极上通过电聚合制备了聚L-半胱氨酸/多壁碳纳米管(poly-L-Cys/MWNT)复合修饰电极。研究了多巴胺(DA)在该电极上的电化学行为。实验表明,poly-L-Cys/MWNT修饰电极对DA有良好的电催化作用,DA在电极上的电氧化还原反应是吸附控制的准可逆过程;DA氧化峰电流与其浓度在80～0.08μmol/L范围内呈良好的线性关系,检出限为0.02μmol/L。常见物质对DA检测无干扰,DA注射液样品检测回收率为98%～104%。A poly （L-cysteine）/muhi-walled carbon nanotube composite （poly-L-cys/MWNT） modified electrode was fabricated by electropolymerization of L-cysteine on a glassy carbon electrode with muhi-walled carbon nanotube as dopant. The electrochemical behavior of dopamine （DA） at the modified electrode was studied. The experiment resuhs show that the modified electrode exhibited strong electrocatalytic activity on the oxidation of DA, and the electrode reaction of DA was a quasi-reversible process controlled mainly by adsorption. The oxidation peak current increased linearly with the concentration of DA in a range of 80 - 0. 08 μmol/L. The detection limit was 0.02 μmol/L. Common impurities have no effect on the determination of DA. The modified electrode was applied to assessing the contents of DA in dopamine hydrochloride injection with a recovery of 98% - 104%.

关 键 词：多巴胺 L-半胱氨酸 多壁碳纳米管 修饰电极 

分 类 号：O657.1[理学—分析化学]