Fabrication of modified TiO2 nanoparticle carbon paste electrode for simultaneous determination of dopamine, uric acid, and l-cysteine
Fabrication of modified TiO2 nanoparticle carbon paste electrode for simultaneous determination of dopamine, uric acid, and l-cysteine
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DOI：
10.1007/s10008-008-0692-2
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发表时间：
2009-09
影响因子：
2.5
通讯作者：
M. Ardakani;A. Talebi;Hossein Naeimi;M. N. Barzoky;N. Taghavinia
中科院分区：
文献类型：
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作者：
M. Ardakani;A. Talebi;Hossein Naeimi;M. N. Barzoky;N. Taghavinia
将2，2′-[1，7-庚二基双（次氮基乙炔）]-双对苯二酚和纳米二氧化钛修饰碳糊电极，用于多巴胺（DA）、尿酸（UA）和l-半胱氨酸的同时测定。采用循环伏安法、计时电流法和方波伏安法进行了研究。测定了DA氧化的电子转移系数（α）和非均相速率常数（ks）等动力学参数。用SWV（pH = 7.0）测定DA的动态范围为8.0-1400 μM，检出限为8.4 × 10− 7 M。该电极用于真实的样品中DA、UA和l-半胱氨酸的测定，结果满意。
A carbon paste electrode, modified with 2, 2′-[1,7-hepthandiylbis(nitriloethylidyne)]-bis-hydroquinone and TiO2nanoparticles, was used for the simultaneous determination of dopamine (DA), uric acid (UA), andl-cysteine. The study was carried out by using cyclic voltammetry, chronoamperometry, and square wave voltammetry (SWV) techniques. Some kinetic parameters such as the electron transfer coefficient (α) and heterogeneous rate constant (ks) were also determined for the DA oxidation. A dynamic range of 8.0–1400 μM, with the detection limit of 8.4 × 10−7M for DA, was obtained using SWV (pH = 7.0). The prepared electrode was successfully applied for the determination of DA, UA, andl-cysteine in real samples.