CoFe2O4 nanoparticles modified carbon paste electrode for simultaneous detection of oxycodone and codeine in human plasma and urine

2016 ◽  
Vol 233 ◽  
pp. 263-271 ◽  
Author(s):  
Abbas Afkhami ◽  
Fatemeh Gomar ◽  
Tayyebeh Madrakian
Keyword(s):  
Human Plasma ◽  
Carbon Paste Electrode ◽  
Simultaneous Detection ◽  
Modified Carbon Paste Electrode ◽  
Carbon Paste ◽  
Cofe2o4 Nanoparticles ◽  
Human Plasma And Urine ◽  
Paste Electrode

scholarly journals Cyclic Voltammetric and Quantum Chemical Studies of a Poly(methionine) Modified Carbon Paste Electrode for Simultaneous Detection of Dopamine and Uric Acid

Chemosensors ◽  
2019 ◽  
Vol 7 (2) ◽  
pp. 24 ◽  
Author(s):  
Bananakere Nanjegowda Chandrashekar ◽  
Weizhong Lv ◽  
Gururaj Kudur Jayaprakash ◽  
Karim Harrath ◽  
Louis W.Y. Liu ◽  
...  
Keyword(s):  
Cyclic Voltammetry ◽  
Uric Acid ◽  
Carbon Paste Electrode ◽  
Simultaneous Detection ◽  
Modified Carbon Paste Electrode ◽  
Carbon Paste ◽  
Oxidation Potentials ◽  
Chemical Studies ◽  
Quantum Chemical Studies ◽  
Paste Electrode

Fabrication of biocompatible electrodes for the investigation of catecholamines is a known challenge. In this work, methionine was chosen as a modifier for fabrication of a biocompatible carbon paste electrode by electropolymerization, through cyclic voltammetry. The electrochemical behavior of the poly(methionine) modified carbon paste electrode was characterized by cyclic voltammetry for simultaneous determination of dopamine (DA) and uric acid (UA) in a phosphate-buffered solution at pH 7.0. In the absence of an amino acid methionine layer, the bare carbon paste electrode exhibits rather poor voltammetric signals in DA and UA in the binary mixture, with oxidation potentials of DA and UA overlapping with each other. The poly(methionine) modified carbon paste electrode exhibits good catalytic activity with noticeably different oxidation potentials of DA and UA. The experimental results closely agree with the theoretical prediction based on a Fukui function complementary to the simulated electrostatic potential maps.

Simultaneous Determination of L-Tyrosine and Caffeine Based on Their Electrocatalytic Oxidation at a 4-tert-butylcalix[6] arene-Modified Carbon Paste Electrode

2013 ◽  
Vol 96 (1) ◽  
pp. 133-141 ◽  
Author(s):  
Ashwini K Srivastava ◽  
Reena R Gaichore
Keyword(s):  
Simultaneous Determination ◽  
Modified Electrode ◽  
Carbon Paste Electrode ◽  
Surface Characterization ◽  
Electrochemical Impedance ◽  
Simultaneous Detection ◽  
Modified Carbon Paste Electrode ◽  
Carbon Paste ◽  
Paste Electrode

Abstract Simultaneous determination of L-tyrosine and caffeine was performed at a carbon paste electrode modified with 4-tert-butylcalix[6]arene and in situ Ni2+ ions. Surface characterization of the electrode was carried out by means of scanning electron microscopy. Electrochemical impedance diagnosis revealed that oxidation of both molecules is kinetically facile on the modified electrode. The electrochemical behavior of both molecules was studied using cyclic voltammetry, and further quantified using differential pulse voltammetry (DPV). The results revealed a high sensitivity for their simultaneous detection. DPV allowed simultaneous detection of L-tyrosine and caffeine in the range of 10–6 to 10–3 M, with LODs of 2.19 × 10–7 and 4.03 × 10–7 M, respectively. The modified electrode was used for individual determination of L-tyrosine and caffeine in various pharmaceutical formulations and simultaneous monitoring in human body fluids.

Selective electrochemical detection of hydroquinone and catechol at a one-step synthesised pine needle-like nano-CePO4 modified carbon paste electrode

RSC Advances ◽  
2016 ◽  
Vol 6 (87) ◽  
pp. 83994-84002 ◽  
Author(s):  
Yuan Dang ◽  
Yanyan Zhai ◽  
Lehui Yang ◽  
Zhenli Peng ◽  
Nan Cheng ◽  
...  
Keyword(s):  
Electrochemical Detection ◽  
Carbon Paste Electrode ◽  
Simultaneous Detection ◽  
Modified Carbon Paste Electrode ◽  
Carbon Paste ◽  
Pine Needle ◽  
One Step ◽  
Paste Electrode

A pine needle-like nano-CePO4 modified carbon paste electrode was successfully constructed for simultaneous detection of hydroquinone and catechol sensitively and selectively.

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