多壁碳纳米管-聚甲基红膜修饰电极测定L-色氨酸  

The Determination of L-Tryptophan on Poly Methyl red Film/Multiwalled Carbon Nanotubes Modified Electrode

作　　者：王佳萱[1] 李将渊[1] 杜冰心[1] 

机构地区：[1]化学合成与污染控制四川省重点实验室西华师范大学化学化工学院,四川南充637009

出　　处：《西华师范大学学报（自然科学版）》2011年第4期340-343,共4页Journal of China West Normal University(Natural Sciences)

基　　金：四川省南充市科学技术局重点科研项目(NO.N2008-SF003)

摘　　要：制备了多壁碳纳米管-聚甲基红膜修饰电极,用循环伏安法和线性扫描伏安法研究了L-色氨酸在修饰电极上的电化学行为.结果表明:在pH=1.8的HCl-KCl底液中,L-色氨酸在修饰电极上出现一不可逆的氧化峰,氧化峰电流与其浓度在6.0×10-6-1.0×10-4mol/L范围内具有良好的线性关系:Ip(A)=-8.6484×10-8-0.2636c(mol/l),相关系数R=-0.9972,检出限为2.0×10-6 mol/L,测定L-色氨酸样品回收率为96.2%-101.3%.Poly Methyl red Film/Multiwalled Carbon Modified Electrode was made. And electrochemical behavior of L-Tryptophan was studied with Cyclic voltammetry and Linear sweep vohammetry. The results indicated that there was an irreversible Oxidation peak of L-Tryptophan in HCl - KCl with pH = 1.8. Good linearity was found between oxidation peak current and concentration of L-Tryptophan - 8. 6484 × 10^ -8 - 0. 2636c（mol/l） , relative coefficient L. Recovery of L-Tryptophan in human urine was 96.2% in range from 6.0 × 10^ -6 to 1.0 × 10 ^-4mol/L. Ip（A） = R was 0. 9972 ,and a detection limit was 2.0× 10^ -6 mol/ -101.3%.

关 键 词：多壁碳纳米管 甲基红 修饰电极 L-色氨酸 

分 类 号：O657.1[理学—分析化学]