【摘要】 研究了多巴胺 (DA)和肾上腺素 (EP)在多壁碳纳米管 (MWNT)修饰电极上的电化学性质 ,发现该修饰电极对神经递质DA和EP有显著的增敏和电分离作用。还原峰电位差达ΔEp=390mV ,可同时测定DA和EP。DA和EP的还原峰电流与其浓度分别在 2 .0× 10 -6～ 1.0× 10 -3 mol/L和 1.0× 10 -6～ 1.0× 10 -3 mol/L浓度范围内呈良好的线性关系 ;方法的检出限分别为 1× 10 -6mol/L和 5× 10 -7mol/L。由于抗坏血酸 (AA)在MWNT修饰电极上的氧化是不可逆的 ,因此利用还原峰进行测定 ,消除了AA对DA和EP的干扰更多还原

【Abstract】 The electrochemical characteristics of dopamine (DA) and epinephrine (EP) at multi-wall carbon nanotube (MWNT) modified graphite electrode have been investigated. It is found that the modified electrode shows enhanced sensitivity and excellent electrochemical discrimination to DA and EP, the cathodic potential difference of DA and EP was about 390 mV. DA and EP can be determined simultaneously. The reduction peak current is proportional to DA and EP concentration in the range of 2.0×10 -6～1.0×10 -3 mol/L and 1.0×10 -6～1.0×10 -3 mol/L , the detection limit can reach 1×10 -6 mol/L and 5×10 -7 mol/L, respectively. Because the oxidation of ascorbic acid (AA) is an irreversible reaction in MWNT film, as a result the interferences of AA for determining DA and EP were eliminated.更多还原