Preparation of GR/HRP/Chit Modified Electrode and its Electrochemical Behaviors

2013 ◽  
Vol 704 ◽  
pp. 87-91
Author(s):  
Hao Shu ◽  
Yan Li Shang ◽  
Han Cui ◽  
Qi Jin Wan ◽  
Nian Jun Yang
Keyword(s):  
Horseradish Peroxidase ◽  
Electrical Activity ◽  
Modified Electrode ◽  
Glassy Carbon ◽  
Electrode Surface ◽  
Enzyme Mechanism ◽  
Carbon Electrode ◽  
Oxidation Peak ◽  
Peak Potential ◽  
Electrochemical Behaviors

Horseradish peroxidase (HRP) was immobilized on the glassy carbon electrode surface by using GR, and GR/HRP/chit modified electrode was prepared. The electrochemical behaviors of GR/HRP/chit/GCE were studied by many electrochemical methods. ImmobilizedHRPshowed a pair of stable redox waves, and oxidation peak was very small, the reduction of peak potential for 0.33 V vs. SCE and retained its bioelectrocatalytic activity for the reduction of H2O2. At the same time, a series of related parameters of the enzyme electrical activity were calculated, further experimental results reflected the enzyme mechanism in the process of reaction.

A Novel Silver-Doped Poly(p-aminobenzene sulfonic acid) Modified Glassy Carbon Electrode for Analysis of H2O2

2012 ◽  
Vol 600 ◽  
pp. 133-136
Author(s):  
De Ling Chi ◽  
Kai Zhao ◽  
Zheng Xiao Liu ◽  
Fei Fei Zhang ◽  
Zong Hua Wang
Keyword(s):  
Glassy Carbon Electrode ◽  
Modified Electrode ◽  
Glassy Carbon ◽  
Sulfonic Acid ◽  
Carbon Electrode ◽  
Modified Glassy Carbon Electrode ◽  
Electrochemical Behaviors

A novel silver-doped poly (p-aminobenzene sulfonic acid) modified electrode was fabricated, of which the electrochemical behaviors were studied with H2O2as a probe. In pH 7.0 PBS, a sensitive reductive peak of H2O2was observed. The modified electrode is of potential in practice for analysis of H2O2in samples such as milk.

scholarly journals Glassy carbon electrode modified with poly(taurine)/TiO2-graphene composite film for determination of acetaminophen and caffeine

2013 ◽  
Vol 19 (3) ◽  
pp. 359-368 ◽  
Author(s):  
Xiao-Qin Xiong ◽  
Ke-Jing Huang ◽  
Chun-Xuan Xu ◽  
Chun-Xue Jin ◽  
Qiu-Ge Zhai
Keyword(s):  
Glassy Carbon Electrode ◽  
Modified Electrode ◽  
Glassy Carbon ◽  
Electrochemical Sensors ◽  
Differential Pulse ◽  
Carbon Electrode ◽  
Modified Glassy Carbon Electrode ◽  
Electrochemical Behaviors ◽  
Potential Applications ◽  
Graphene Nanocomposite

A novel electrochemical sensor poly(taurine)/TiO2-graphene nanocomposite modified glassy carbon electrode (PT/TiO2-Gr/GCE) was fabricated. This sensor was based on an electrochemically polymerized taurine layer on a TiO2-graphene modified glassy carbon electrode. The electrochemical behaviors of acetaminophen and caffeine at the modified electrode were studied by cyclic voltammetry and differential pulse voltammetry. The results showed that the oxidation peak currents of acetaminophen and caffeine were linear with their concentrations in the range of 1?10-7-9?10-5 M and 2.5?10-5-2?10-4 M, respectively. The detection limits of acetaminophen and caffeine were 3.4?10-8 M and 5.0?10-7 M, respectively (S/N=3). This modified electrode showed good sensitivity and stability, which had promising potential applications in electrochemical sensors and biosensors design.

scholarly journals Voltammetric determination of dopamine in the presence of uric acid using a 2-hydroxy-1-(1-hydroxynaphthyl-2-azo)- naphthalin-4-sulfonic acid modified glassy carbon electrode

2010 ◽  
Vol 75 (12) ◽  
pp. 1685-1699 ◽  
Author(s):  
Asghar Ensafi ◽  
Samira Dadkhah-Tehrani ◽  
B. Rezaei
Keyword(s):  
Uric Acid ◽  
Glassy Carbon Electrode ◽  
Modified Electrode ◽  
Glassy Carbon ◽  
Sulfonic Acid ◽  
Reaction Rate Constant ◽  
Carbon Electrode ◽  
Electrochemical Behaviors ◽  
Peak Separation

A polymerized film of 2-hydroxy-1-(1-hydroxynaphthyl-2-azo)- naphthalin-4-sulfonic acid (HHNANSA) was prepared at the surface of a glassy carbon electrode by electropolymerization. The modified electrode was used for the simultaneous determination of dopamine (DA) and uric acid (UA). The electrochemical behaviors of the compounds at the surface of the modified electrode were studied using cyclic voltammetry, chronoamperometry, and square wave voltammetry (SWV). The experimental results indicated that the modified electrode exhibited an efficient electrocatalytic activity towards the oxidation of DA and UA, with a peak separation of about 140 mV at pH 5.0. Using chronoamperometry, the catalytic reaction rate constant was measured and found to equal to 1.23 ? 104 mol-1 L s-1. At pH 5.0, the catalytic peak currents linearly depended on the DA and/or UA concentrations in the range of 1.0 - 300 ?mol L-1 DA (two linear segments with different slopes) and 6.7 - 20 ?mol L-1 UA, using SWV. The detection limits for DA and UA were 0.25 ?mol L-1 and 1.17 ?mol L-1, respectively. The RSD % for 40.0 and 140.0 ?mol L-1 DA were 1.9 % and 2.2 %, respectively, whereas for 10.0 and 20.0 ?mol L-1 UA, they were 1.8 % and 1.2 %, respectively. The modified electrode showed good sensitivity, selectivity, and stability. It was successfully applied for the determination of DA and UA in real samples, such as drugs and urine.

Electrocatalytic Property Toward Dopamine and Uric Acid of the Nanoparticles TiO2 Modified Electrode

2013 ◽  
Vol 785-786 ◽  
pp. 508-511
Author(s):  
Ying Zhang ◽  
Guo Bao Li ◽  
Qiu Xia Yang
Keyword(s):  
Uric Acid ◽  
Linear Relationship ◽  
Glassy Carbon Electrode ◽  
Modified Electrode ◽  
Glassy Carbon ◽  
Differential Pulse ◽  
Carbon Electrode ◽  
Oxidation Peak ◽  
Good Electrocatalytic Activity

The titanium sol was prepared by depositing the organic titanium on glassy carbon electrode surface. Electrophoresis time and the applied voltage as well can markedly influence the electrochemical behavior of the nanoTiO2film. In contrast with bare glassy carbon electrode, the nanoTiO2film on glassy carbon electrode had a good electrocatalytic activity to dopamine (DA) and uric acid (UA) in PBS solution. The result showed that there was a linear relationship between the oxidation peak currents and the concentration of DA from 8.0×10-6to 4.0×10-4mol·L-1by differential pulse voltammetry (DPV) and there was a linear relationship between the oxidation peak currents and the concentration of UA from 8×10-6to 1.0×10-3mol·L-1. This modified electrode was quite effective to detect DA and UA in simultaneous determination of these species in a mixture.

Electrochemical sensing of dopamine at the surface of a dopamine grafted graphene oxide/poly(methylene blue) composite modified electrode

RSC Advances ◽  
2016 ◽  
Vol 6 (24) ◽  
pp. 19982-19991 ◽  
Author(s):  
Demudu Babu Gorle ◽  
Manickam Anbu Kulandainathan
Keyword(s):  
Methylene Blue ◽  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Glassy Carbon Electrode ◽  
Modified Electrode ◽  
Glassy Carbon ◽  
Electrode Surface ◽  
Electrochemical Sensing ◽  
Carbon Electrode ◽  
Reduced Graphene

We prepared a reduced graphene oxide/poly(methylene blue) composite on a glassy carbon electrode surface and electrografted dopamine onto the surface for the sensing of dopamine.

Electrosynthesis and electrochemical characteristics of 2,2′-(4,5-dihydroxy-3-methoxy-1,2-phenylene)bis(3-oxo-3-phenylpropanenitrile): application as a mediator for determination of hydroxylamine at a carbon nanotube modified electrode surface

2014 ◽  
Vol 6 (15) ◽  
pp. 5999-6008 ◽  
Author(s):  
Hamid R. Zare ◽  
Milad Tashkili ◽  
Hossein Khoshro ◽  
Davood Nematollahi ◽  
Ali Benvidi
Keyword(s):  
Carbon Nanotube ◽  
Glassy Carbon Electrode ◽  
Modified Electrode ◽  
Glassy Carbon ◽  
Electrode Surface ◽  
Electrocatalytic Oxidation ◽  
Electrochemical Characteristics ◽  
Carbon Electrode ◽  
Modified Glassy Carbon Electrode

Electrosynthesis and electrochemical characteristics of an electrodeposited DMPP film on a multi-wall carbon nanotube modified glassy carbon electrode and its role as a mediator for electrocatalytic oxidation of hydroxylamine.

Self-Assembled Graphene for Determination of Catechol in Wastewater at Modified Glassy Carbon Electrode

2012 ◽  
Vol 161 ◽  
pp. 255-259 ◽  
Author(s):  
Mei Feng Chen ◽  
Xin Ying Ma ◽  
Xia Li
Keyword(s):  
Cyclic Voltammetry ◽  
Detection Limit ◽  
Glassy Carbon Electrode ◽  
Modified Electrode ◽  
Glassy Carbon ◽  
High Sensitivity ◽  
Carbon Electrode ◽  
Oxidation Peak ◽  
Modified Glassy Carbon Electrode

Graphene-modified glassy carbon electrode was made by dropping. In phosphate-citric acid buffered saline, the modified electrode was shown to possess an excellent selective electrocatalytical effect on the redox of catechol, and further used to determine catechol in the presence of resorcin and hydroquinone by cyclic voltammetry. The oxidation peak currents Ipa showed a linear relationship with the concentrations (c) of catechol in the range of 2.97×10-7 mol•L-1~9.31×10-6 mol•L-1 and 9.31×10-6 mol•L-1~1.03×10-4 mol•L-1 with a correlation coefficient as follows: Ipa1(A)= -4.10×10-6-2.31c, R=0.Superscript text9971; Ipa2 (A) =-1.50×10-5-0.60c, R=0.9953, respectively, and the detection limit is 2.50×10-8 mol•L-1. The modified electrode is high sensitivity, selectivity, stability, and has been successfulSuperscript textly applied to analyzing catechol in wastewater.

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