Influence of dispersing agent on the electroanalytical quantification of 8-hydroxy 2'- deoxyguanosine or uric acid on a glassy carbon electrode modified with carbon nanotubes

机译：分散剂对碳纳米管修饰的玻碳电极上8-羟基2'-脱氧鸟苷或尿酸的电分析定量的影响

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In this paper we report the highly sensitive quantification of 8-hydroxy 2'-deoxyguanosine (8-OHdG) or uric acid (UA) in the presence of ascorbic acid (AA) using glassy carbon electrodes (GCE) modified with multiple-wall carbon nanotubes (CNT), dispersed in various polymers such as nafion (GCE/CNT-Pnaf), polyacrylic acid (GCE/CNT-Paa), percoll (GCE/CNT-Prl) and polyvinyl alcohol (GCE/CNT-Pva). The electrocatalytic activity of CNT deposited on GCE shows a significant diminish on the AA overpotential oxidation value (257 mV); making possible the AA oxidation process separation from 8-OHdG and UA ones. Using differential pulse anodic stripping voltammetry (DPASV), the analytes were quantified. The optimum sensitivity obtained in the quantification of 8-OHdG was (3.3 ± 0.1) × 10~6 μAM~(-1) (r = 0.994), and for UA, (3.2 ± 0.2) × 10~6 μAM~(-1) (r = 0.991) on GCE/CNT-Pnaf, both in the presence of 1.0 mM of AA. The detection limits for 8-OHdG and UA on GCE/CNT-Pnafate around 13×10~(-9) M.

机译：在本文中，我们报告了使用多壁碳修饰的玻璃碳电极（GCE）在抗坏血酸（AA）存在下对8-羟基2'-脱氧鸟苷（8-OHdG）或尿酸（UA）的高灵敏度定量碳纳米管（CNT），分散在各种聚合物中，例如nafion（GCE / CNT-Pnaf），聚丙烯酸（GCE / CNT-Paa），percoll（GCE / CNT-Prl）和聚乙烯醇（GCE / CNT-Pva）。沉积在GCE上的CNT的电催化活性对AA的超电势氧化值（257 mV）显着降低。使AA氧化过程与8-OHdG和UA分离。使用差分脉冲阳极溶出伏安法（DPASV）对分析物进行定量。在8-OHdG定量中获得的最佳灵敏度为（3.3±0.1）×10〜6μAM〜（-1）（r = 0.994），对于UA，则为（3.2±0.2）×10〜6μAM〜（- 1）在1.0 mM AA的存在下，在GCE / CNT-Pnaf上（r = 0.991）。 GCE / CNT-Pnafate上8-OHdG和UA的检出限约为13×10〜（-9）M.

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来源
《MES 25: electrochemistry for alternative energy sources and environmental improvement》|2010年|p.369-380|共12页
会议地点 Zacatecas(MX);Zacatecas(MX)
作者
Alejandro Gutierrez; Silvia Gutierrez; Guadalupe Garcia; Laura Galicia; Gustavo A. Rivas;
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作者单位

Universidad Autonoma Metropolitana Iztapalapa. Depto. de Quimica. Av. Michoacan y la Purisima, Col. Vicentina. C.P. 09340, Mexico;

Departamento de Quimica de la Universidad de Guanajuato, Cerro de la Venada S/N. C.P. 36040, Mexico;

Departamento de Quimica de la Universidad de Guanajuato, Cerro de la Venada S/N. C.P. 36040, Mexico;

Universidad Autonoma Metropolitana Iztapalapa. Depto. de Quimica. Av. Michoacan y la Purisima, Col. Vicentina. C.P. 09340, Mexico;

INFIQC, Departamento de Fisico Qufmica, Facultad de Ciencias Quimicas, Universidad National de Cordoba. 5000 Cordoba, Argentina;

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中图分类电化学工业;
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Influence of dispersing agent on the electroanalytical quantification of 8-hydroxy 2'- deoxyguanosine or uric acid on a glassy carbon electrode modified with carbon nanotubes

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