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Title of Journal: J Solid State Electrochem

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Abbravation: Journal of Solid State Electrochemistry

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Springer-Verlag

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DOI

10.1007/s12665-014-3314-6

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1433-0768

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Simultaneous determination of levodopa NADH and

Authors: Mohammad Reza Akhgar Mohammad Salari Hassan Zamani
Publish Date: 2010/08/13
Volume: 15, Issue: 4, Pages: 845-853
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Abstract

The redox response of a modified carbon nanotube paste electrode of ferrocenedicarboxylic acid was investigated Cyclic voltammetry differential pulse voltammetry and chronoamperometry were used to investigate the electrochemical behavior of levodopa LD at modified electrode Under the optimized conditions pH 50 the modified electrode showed high electrocatalytic activity toward LD oxidation the overpotential for the oxidation of LD was decreased by more than 190 mV and the corresponding peak current increased significantly Differential pulse voltammetric peak currents of LD increased linearly with its concentrations at the range of 004 to 1100 μM and the detection limit 3σ was determined to be 12 nM The diffusion coefficient left D = 92 times 10 6hboxchboxm2/hboxs right and transfer coefficient α = 049 of LD were also determined Mixture of LD NADH and tryptophan TRP can be separated from one another by differential pulse voltammetry These conditions are sufficient to allow determination of LD NADH and TRP both individually and simultaneously The modified electrode showed good reproducibility remarkable longterm stability and especially good surface renewability by simple mechanical polishing The results showed that this electrode could be used as an electrochemical sensor for determination of LD NADH and TRP in real samples such as urine and water samples

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