Abstract
A sensitive and selective electrochemical sensor was fabricated using a modified carbon nanotube paste electrode (MCNPE). The application of this sensor was investigated in determination of carbidopa (CD), uric acid (UA) and folic acid (FA). In order to study the electrochemical behaviors of the CD, cyclic and square wave voltammetric studies were carried out at the surfaces of the modified electrode. Application of the modified electrode resulted in a sensitivity enhancement and a considerable decrease in the anodic overpotential, leading to negative shift in peak potential for CD. Using square wave voltammetry (SWV), the prepared sensor showed good sensitivity and selectivity for the determination of CD in wide linear ranges of 0.09 to 400.0μM with a detection limit (3σ) of 71.0±2nM. The modified electrode was successfully applied for CD, UA and FA determinations in urine sample.
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