期刊
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
卷 13, 期 9, 页码 1433-1440出版社
SPRINGER
DOI: 10.1007/s10008-008-0692-2
关键词
Carbon paste electrode; Dopamine; Uric acid; L-Cysteine; Nanoparticles
资金
- Yazd University Research Council
- IUT Research Council
- Excellence in Sensors
A carbon paste electrode, modified with 2, 2'-[1,7-hepthandiylbis(nitriloethylidyne)]-bis-hydroquinone and TiO2 nanoparticles, was used for the simultaneous determination of dopamine (DA), uric acid (UA), and L-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 (alpha) and heterogeneous rate constant (k(s)) were also determined for the DA oxidation. A dynamic range of 8.0-1400 mu M, with the detection limit of 8.4 x 10(-7) M for DA, was obtained using SWV (pH=7.0). The prepared electrode was successfully applied for the determination of DA, UA, and L-cysteine in real samples.
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