Journal
JOURNAL OF THE SERBIAN CHEMICAL SOCIETY
Volume 74, Issue 12, Pages 1443-1453Publisher
SERBIAN CHEMICAL SOC
DOI: 10.2298/JSC0912443Y
Keywords
carbidopa; ferrocene; carbon nanotube; modified electrode; voltammetry
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A chemically modified carbon paste electrode (MCPE) containing ferrocene (FC) and carbon nanotubes (CNT) was constructed. The electrochemical behavior and stability of the MCPE were investigated by cyclic voltammetry. The electrocatalytic activity of the MCPE was investigated and it showed good characteristics for the oxidation of carbidopa (CD) in phosphate buffer solution (PBS). A linear concentration range of 5 to 600 mu M CD, with a detection limit of 3.6 +/- 0.17 mu M CD, was obtained. The diffusion coefficient of CD and the transfer coefficient (alpha) were also determined. The MCPE showed good reproducibility, remarkable long-term stability and especially good surface renewability by simple mechanical polishing. The results showed that this electrode could be used as an electrochemical sensor for the determination of CD in real samples, such as urine samples.
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