Electrochemical determination of tyrosine in the presence of uric acid at a carbon paste electrode modified with multi-walled carbon nanotubes enhanced by sodium dodecyl sulfate

被引：29
|
作者：
Ghoreishi, Sayed Mehdi [1 ]
Behpour, Mohsen [1 ]
Delshad, Mona [1 ]
Khoobi, Asma [1 ]
机构：
[1] Univ Kashan, Fac Chem, Dept Analyt Chem, Kashan 8731751167, Iran
来源：
CENTRAL EUROPEAN JOURNAL OF CHEMISTRY | 2012年 / 10卷 / 06期
关键词：
Tyrosine; Uric acid; Multiwalled carbon nanotube; Voltammetry; Sodium dodecyl sulfate; AMINO-ACIDS; VOLTAMMETRIC DETERMINATION; LIQUID-CHROMATOGRAPHY; MASS-SPECTROMETRY; TRYPTOPHAN; OXIDATION; PHENYLALANINE; BEHAVIOR;
D O I：
10.2478/s11532-012-0119-x
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
Tyrosine (Tyr) was quantitated with high sensitivity and selectivity in the presence of uric acid (UA) using a carbon paste electrode modified with multi-walled carbon nanotubes. Tyr and UA were catalytically oxidized with diffusion-controlled characteristics. They were determined simultaneously by differential pulse voltammetry with a potential difference of 350 mV. The electrocatalytic currents increase linearly with Tyr and UA concentrations 4x10(-7)-1x10(-4) M and 3x10(-7)-2x10(-4) M. Their detection limits were 1x10(-7) and 5.1x10(-8) M respectively. In the presence of sodium dodecyl sulfate the Tyr detection limit improved from 1x10(-7) to 6.9x10(-8) M. The electrode was successfully used to quantitate Tyr and UA in serum.
引用
收藏
页码：1824 / 1829
页数：6
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