Differential pulse voltammetric determination of N-acetylcysteine by the electrocatalytic oxidation at the surface of carbon nanotube-paste electrode modified with cobalt salophen complexes

2008 ◽  
Vol 133 (2) ◽  
pp. 599-606 ◽  
Author(s):  
Saeed Shahrokhian ◽  
Zahra Kamalzadeh ◽  
Abolfazl Bezaatpour ◽  
Davar M. Boghaei
Keyword(s):  
Carbon Nanotube ◽  
Electrocatalytic Oxidation ◽  
Differential Pulse ◽  
Voltammetric Determination ◽  
Carbon Nanotube Paste Electrode ◽  
Paste Electrode

scholarly journals Rapid Electrochemical Monitoring of Tyrosine by Poly (Riboflavin) Modified Carbon Nanotube Paste Electrode as a Sensitive Sensor and its Applications in Pharmaceutical Samples

2021 ◽  
Vol 11 (6) ◽  
pp. 14661-14672
Keyword(s):  
Carbon Nanotube ◽  
Differential Pulse ◽  
Pharmaceutical Samples ◽  
Electrocatalytic Effect ◽  
Carbon Nanotube Paste Electrode ◽  
Sensitive Sensor ◽  
Electro Oxidation ◽  
Electrochemical Monitoring ◽  
Paste Electrode

A poly(riboflavin) modified carbon nanotube paste electrode (PRFMCNTPE) is employed as a compatible and electrocatalytic sensor for the determination of Tyrosine (TYR). The analysis and assessment are carried out through differential pulse voltammetry (DPV) and Cyclic Voltammetry (CV). The surface of the intended sensor is examined through Field Emission Scanning Electron Microscopy (FE-SEM). The modified electrode shows the outstanding electrocatalytic effect for TYR with high selectivity and sensitivity as compared to carbon nanotube paste electrode (CNTPE). The electro-oxidation peak current of TYR and its concentration is found linear from 2 µM to 10 µM with a detection limit (LOD) of 0.45 µM. The developed sensor is productively applied for the determination of TYR in pharmaceutical samples like Tyrosine capsules. The adapted electrode shows good stability, excellent reproducibility, and remarkable sensitivity.

scholarly journals Highly Sensitive Electrocatalytic Determination of Formaldehyde Using a Ni/Ionic Liquid Modified Carbon Nanotube Paste Electrode

2018 ◽  
Vol 13 (3) ◽  
pp. 529
Author(s):  
Ebrahim Zarei ◽  
Mohammad Reza Jamali ◽  
Farideh Ahmadi
Keyword(s):  
Cyclic Voltammetry ◽  
Ionic Liquid ◽  
Carbon Nanotube ◽  
Transfer Rate ◽  
Electrocatalytic Oxidation ◽  
Highly Sensitive ◽  
Carbon Nanotube Paste Electrode ◽  
Electrocatalytic Determination ◽  
Paste Electrode

In this study, ionic liquid 1-hexyl-3-methylimidazolium hexafluorophosphate was applied as additives to fabricate a novel ionic liquid/carbon nanotube paste electrode (IL/CNPE). This electrode was characterized by electrochemical impedance spectroscopy and cyclic voltammetry. Results showed that the electron transfer rate and reversibility of the electrode were increased by the ionic liquid. The morpho-logy of prepared IL/CNPE was studied by scanning electron microscopy. Nickel/ionic liquid modified carbon nanotube paste electrode (Ni/IL/CNPE) was also constructed by immersion of the IL/CNPE in nickel sulfate solution. Ionic liquid showed significant effect on the accumulation of nickel species on the surface of the electrode. Also, the values of electron transfer coefficient, charge-transfer rate constant and electrode surface coverage for Ni(II)/Ni(III) redox couple of the Ni/IL/CNPE were found to be 0.32 and 2.37×10-1 s-1 and 2.74×10-8 mol.cm-2, respectively. The Ni/IL/CNPE was applied successfully to highly efficient electrocatalytic oxidation of formaldehyde in alkaline medium. The effects of various factors on the efficiency of electrocatalytic oxidation of formaldehyde were optimized. Under the optimized condition, cyclic voltammetry of formaldehyde at the modified electrode exhibited two linear dynamic ranges in the concentration ranges of 7.00×10-6 to 9.60×10-5 mol.L-1 and 9.60×10-5 to 32.00×10-3 mol.L-1 with excellent detection limit of 9.50×10-7 mol.L-1 (3σ/slope), respectively. Also, the method was successfully applied for formaldehyde measurement in real sample. Copyright © 2018 BCREC Group. All rights reservedReceived: 11st March 2018; Revised:20th July 2018; Accepted: 28th July 2018How to Cite: Zarei, E., Jamali, M.R., Ahmadi, F. (2018). Highly Sensitive Electrocatalytic Determination of Formaldehyde Using a Ni/Ionic Liquid Modified Carbon Nanotube Paste Electrode. Bulletin of Chemical Reaction Engineering & Catalysis, 13 (3): 529-542 (doi:10.9767/bcrec.13.3.2341.529-542)Permalink/DOI: https://doi.org/10.9767/bcrec.13.3.2341.529-542 

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