scholarly journals Modified Carbon Nanotube Paste Electrode for Voltammetric Determination of Carbidopa, Folic Acid, and Tryptophan

2012 ◽  
Vol 2012 ◽  
pp. 1-8 ◽  
Author(s):  
Sakineh Esfandiari Baghbamidi ◽  
Hadi Beitollahi ◽  
Hassan Karimi-Maleh ◽  
Somayeh Soltani-Nejad ◽  
Vahhab Soltani-Nejad ◽  
...  
Keyword(s):  
Folic Acid ◽  
Carbon Nanotube ◽  
Voltammetric Determination ◽  
Multiwall Carbon Nanotube ◽  
Wave Voltammetry ◽  
Carbon Nanotube Paste Electrode ◽  
Optimized Conditions ◽  
Paste Electrode ◽  
Multiwall Carbon

A simple and convenient method is described for voltammetric determination of carbidopa (CD), based on its electrochemical oxidation at a modified multiwall carbon nanotube paste electrode. Under optimized conditions, the proposed method exhibited acceptable analytical performances in terms of linearity (over the concentration range from 0.1 to 700.0 μM), detection limit (65.0 nM), and reproducibility (RSD=2.5%) for a solution containing CD. Also, square wave voltammetry (SWV) was used for simultaneous determination of CD, folic acid (FA), and tryptophan (TRP) at the modified electrode. To further validate its possible application, the method was used for the quantification of CD, FA, and TRP in urine samples.

Determination of diethofencarb (isopropyl 3,4-diethoxyphenylcarbamate) by square wave voltammetry using a multiwall carbon nanotube paste electrode

2015 ◽  
Vol 7 (19) ◽  
pp. 8373-8378 ◽  
Author(s):  
Nur AKBAŞ ◽  
Recai İNAM
Keyword(s):  
Carbon Nanotube ◽  
Square Wave Voltammetry ◽  
Anodic Peak ◽  
Multiwall Carbon Nanotube ◽  
Square Wave ◽  
Wave Voltammetry ◽  
Carbon Nanotube Paste Electrode ◽  
Paste Electrode ◽  
Multiwall Carbon

A new sensitive square wave anodic peak at +861 mV obtained using a newly prepared carbon nanotube electrode provided determination of the fungicide diethofencarb.

scholarly journals Voltammetric Determination of Homocysteine Using Multiwall Carbon Nanotube Paste Electrode in the Presence of Chlorpromazine as a Mediator

2012 ◽  
Vol 2012 ◽  
pp. 1-7 ◽  
Author(s):  
Fathali Gholami-Orimi ◽  
Farshad Taleshi ◽  
Pourya Biparva ◽  
Hassan Karimi-Maleh ◽  
Hadi Beitollahi ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Dynamic Range ◽  
Voltammetric Determination ◽  
Multiwall Carbon Nanotube ◽  
Catalytic Rate Constant ◽  
Carbon Nanotube Paste Electrode ◽  
Double Potential Step Chronoamperometry ◽  
Paste Electrode ◽  
Multiwall Carbon

We propose chlorpromazine (CHP) as a new mediator for the rapid, sensitive, and highly selective voltammetric determination of homocysteine (Hcy) using multiwall carbon nanotube paste electrode (MWCNTPE). The experimental results showed that the carbon nanotube paste electrode has a highly electrocatalytic activity for the oxidation of Hcy in the presence of CHP as a mediator. Cyclic voltammetry, double potential step chronoamperometry, and square wave voltammetry (SWV) are used to investigate the suitability of CHP at the surface of MWCNTPE as a mediator for the electrocatalytic oxidation of Hcy in aqueous solutions. The kinetic parameters of the system, including electron transfer coefficient, and catalytic rate constant were also determined using the electrochemical approaches. In addition, SWV was used for quantitative analysis. SWV showed wide linear dynamic range (0.1–210.0 μM Hcy) with a detection limit of 0.08 μM Hcy. Finally, this method was also examined as a selective, simple, and precise electrochemical sensor for the determination of Hcy in real samples.

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