2008
DOI: 10.1080/00032710802238036
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Modified Glassy Carbon Electrode with Multiwall Carbon Nanotubes as a Voltammetric Sensor for Determination of Leucine in Biological and Pharmaceutical Samples

Abstract: A simple and highly sensitive method is described for voltammetric determination of leucine in blood and urine samples; namely, a glassy carbon electrode with an effective method is modified with multiwall carbon nanotubes (MWNTs). The cyclic voltammetric results indicated that MWNTs remarkably enhanced electrocatalytic activity toward the oxidation of leucine. Under the optimum condition the calibration curve was linear in the concentration range 9.0 Â 10 À6 À 1.5 Â 10 À3 mol L À1 , with the detection limit o… Show more

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Cited by 32 publications
(16 citation statements)
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“…The area of the electrode was obtained by cyclic voltammetric method using 1.0 10 À3 M K 3 Fe(CN) 6 as a probe at different scan rates [18]. For a reversible process, the following Randles-Sevcik formula can be used…”
Section: Preparation Of Electrodementioning
confidence: 99%
“…The area of the electrode was obtained by cyclic voltammetric method using 1.0 10 À3 M K 3 Fe(CN) 6 as a probe at different scan rates [18]. For a reversible process, the following Randles-Sevcik formula can be used…”
Section: Preparation Of Electrodementioning
confidence: 99%
“…Unless otherwise stated, the paste was carefully removed prior to pressing a new portion into the electrode after every measurement. The area of the electrode was obtained by cyclic voltammetric method using 1.0 Â 10 À3 M K 3 Fe(CN) 6 as a probe at different scan rates (Rezaei and Zare 2008). For a reversible process, the following RandlesSevcik formula can be used:…”
Section: Preparation Of Electrodementioning
confidence: 99%
“…Where I pa refers to the anodic peak current, n is the number of electrons transferred, A 0 is the surface area of the electrode, D 0 is the diffusion coefficient, υ is the scan rate (V.s −1 ) and C 0 is the concentration of K 4 Fe (CN) 6 . For 1.0 mM K 4 Fe (CN) 6 , n=1, D o =7.6×10 −6 cm 2 s −1 , then from the slope of the plot of I pa vs. υ 1/2 , the electro‐active area was calculated . In our experiment, electro‐active areas of GPE and GCE were found to be 0.2207 and 0.118 cm 2 .…”
Section: Resultsmentioning
confidence: 99%