Carbon nanotubes and (4-((E)-(2-methyl-4-nitrophenylimino) methyl) benzene-1,2-diol) modified glassy carbon electrode as a new electrocatalyst for oxidation of levodopa

• Published in: Catalysis science & technology Vol. 3; no. 1; pp. 2634 - 2638
• Main Authors: Mazloum-Ardakani, Mohammad, Yavari, Mozhgan, Ali Sheikh-Mohseni, Mohammad, Mirjalili, Bibi-Fatemeh
• Format: Journal Article
• Language: English
• Published: 01.01.2013
• Subjects: Catalysis; Electrocatalysts; Electrodes; Electron transfer; Multi wall carbon nanotubes; Oxidation; Rate constants; Sensors
• ISSN: 2044-4753; 2044-4761
• DOI: 10.1039/c3cy00163f

This work investigates the electrocatalytic activity of (4-(( E )-(2-methyl-4-nitrophenylimino) methyl) benzene-1,2-diol) and multi-wall carbon nanotubes (MNB-MWCNT-GCE) for levodopa (LD) oxidation. At first the electrochemical behavior of MNB as a newly synthesized compound was studied; the apparent electron transfer rate constant of k s = 36.3 s −1 and electron transfer coefficient of α = 0.47 was obtained for MNB. The modified electrode showed an electrocatalytic activity for oxidation of LD with the catalytic reaction rate constant of k h = 324.75 M −1 s −1 . The peak potential for the oxidation of LD at the modified electrode was lowered by at least 326 mV from the unmodified electrode. Additionally, the proposed electrocatalyst was used as a LD sensor. This sensor showed a linear response in the range of 5.0 × 10 −7 − 9.0 × 10 −4 M and a detection limit of 3.7 × 10 −7 M for LD. A new synthesized hydroquinone and CNT modified electrode shows electrocatalytic activity for oxidation of levodopa in cyclic voltammetry experiments.