A label-free electrochemical impedance immunosensor based on AuNPs/PAMAM-MWCNT-Chi nanocomposite modified glassy carbon electrode for detection of Salmonella typhimurium in milk

2013 ◽  
Vol 141 (3) ◽  
pp. 1980-1986 ◽  
Author(s):  
Jing Dong ◽  
Han Zhao ◽  
Minrong Xu ◽  
Qiang Ma ◽  
Shiyun Ai
Keyword(s):  
Salmonella Typhimurium ◽  
Glassy Carbon Electrode ◽  
Glassy Carbon ◽  
Electrochemical Impedance ◽  
Carbon Electrode ◽  
Label Free ◽  
Modified Glassy Carbon Electrode ◽  
Impedance Immunosensor

Preparation and characterization of a poly-o-phenylenediamine film modified glassy carbon electrode as a H2O2 sensor

2013 ◽  
Vol 91 (11) ◽  
pp. 1077-1084 ◽  
Author(s):  
Wenying Zhai ◽  
Xiuying Tian ◽  
Yun Yan ◽  
Yuehua Xu ◽  
Yuechun Zhao ◽  
...  
Keyword(s):  
Cyclic Voltammetry ◽  
Glassy Carbon Electrode ◽  
Glassy Carbon ◽  
Electrochemical Impedance ◽  
Monomer Concentration ◽  
Acetate Buffer ◽  
Acetate Buffer Solution ◽  
Carbon Electrode ◽  
Modified Glassy Carbon Electrode ◽  
Buffer Solution

A poly-o-phenylenediamine film modified glassy carbon electrode (PoPD/GC) was successfully prepared by cyclic voltammetry in acetate buffer solution. The polymerization mechanism of oPD is discussed. The impedance behavior and morphology of the PoPD membrane were characterized using cyclic voltammetry, electrochemical impedance spectroscopy, and scanning electron microscopy, respectively. It is discovered that the PoPD/GC prepared only in acetate buffer solution had dual electrocatalytic activity toward the oxidation and reduction of H2O2. The optimal buffer solution pH, scanning rate, monomer concentration, and number of scannings for film forming were 4.2, 0.05 V s−1, 6.0 mmol L−1, and 30, respectively. The linear ranges between the anodic (Δia) or cathodic (Δic) current and H2O2 concentration were 0.07−1.0 × 104 and 0.04−4.5 × 104 μmol L−1, respectively. The corresponding calibration curves were Δia (μA) = 8.03c (mmol L−1) + 6.36 (n = 18, R2 = 0.9989) and Δic (μA) = −5.52c (mmol L−1) − 0.77 (n = 18, R2 = 0.9990) with a detection limit of 0.03 and 0.02 μmol L−1 (S/N = 3), respectively. The PoPD/GC prepared in the optimal conditions showed good stability and quick response (<0.2 s) to H2O2, which was successfully applied to the determination of H2O2 in real water samples with satisfactory results.

scholarly journals Electrocatalysis of a SiC particle-modified glassy carbon electrode for the oxidation of adrenaline in a KRPB physiological solution

2005 ◽  
Vol 70 (5) ◽  
pp. 745-752 ◽  
Author(s):  
Zhang-Yu Yu ◽  
De-Sheng Kong ◽  
Shu-Xin Wu ◽  
Lei Wang ◽  
Hanf-Qing Wang
Keyword(s):  
Glassy Carbon Electrode ◽  
Glassy Carbon ◽  
Electrochemical Impedance ◽  
Electrochemical Reaction ◽  
Physiological Solution ◽  
Carbon Electrode ◽  
Modified Glassy Carbon Electrode ◽  
Adsorption Effect ◽  
Electrocatalytic Effect ◽  
Sic Particle

The electrocatalytic properties of a SiC particle-modified glassy carbon electrode (MGC) for adrenaline oxidation were studied by cyclic voltammetry, double-potential step chronoculometry and electrochemical impedance spectroscopy in a pH 7.4 physiological Kres?Ringer phosphate buffer (KRPB) solution. It was shown that modification of the electrode with SiC particles has a marked electrocatalytic effect on the electrochemical reaction of adrenaline, i.e., the activity and the reversibility of the MGC electrode were significantly improved compared to an unmodified electrode. This was attributed to the adsorption effect of the electroactive adrenaline molecules on the MGC electrode surface. .

scholarly journals Poly(glutamic acid) nanofibre modified glassy carbon electrode: Characterization by atomic force microscopy, voltammetry and electrochemical impedance

2008 ◽  
Vol 53 (11) ◽  
pp. 3991-4000 ◽  
Author(s):  
Daniela Pereira Santos ◽  
Maria Valnice Boldrin Zanoni ◽  
Márcio Fernando Bergamini ◽  
Ana-Maria Chiorcea-Paquim ◽  
Victor Constantin Diculescu ◽  
...  
Keyword(s):  
Atomic Force Microscopy ◽  
Glutamic Acid ◽  
Glassy Carbon Electrode ◽  
Glassy Carbon ◽  
Electrochemical Impedance ◽  
Carbon Electrode ◽  
Modified Glassy Carbon Electrode ◽  
Force Microscopy ◽  
Atomic Force ◽  
Electrode Characterization

scholarly journals Electroanalysis of Diazepam on Nanosize Conducting Poly (3-Methylthiophene) Modified Glassy Carbon Electrode

2014 ◽  
Vol 17 (3) ◽  
pp. 185-190 ◽  
Author(s):  
A. Lakshmi ◽  
G. Gopu ◽  
S. Thanikaikarasan ◽  
T. Mahalingam ◽  
Peggy Alvarez ◽  
...  
Keyword(s):  
Glassy Carbon Electrode ◽  
Glassy Carbon ◽  
Electrochemical Impedance ◽  
Limit Of Detection ◽  
Detection Sensitivity ◽  
Carbon Electrode ◽  
Modified Glassy Carbon Electrode ◽  
Peak Current ◽  
Real Sample Analysis ◽  
Relative Standard

A glassy carbon electrode (GCE) was modified with nanosize poly (3-methylthiophene) (P3MT) and used for the sensitive voltammetric determination of diazepam. The cyclic voltammetric response of the bare GCE was compared with the P3MT modified electrode. Electrochemical impedance response of diazepam on modified GCE was studied by various concentrations of diazepam from 0.2 μM to 0.6 μM. The poly (3-methylthiophene) modified glassy carbon electrode (P3MT/GCE) can greatly enhance the peak currents and the detection sensitivity of diazepam under optimal conditions. The quantitative analysis of diazepam was made by the DPSV method. The experimental results showed that the peak current increased with the increase in concentration of diazepam. A calibration was made, which indicated the linear dependence of peak current with concentration (ip = 13.31Conc. + 0.4359R2 = 0.9948) in the range od determination and ot was found to be good between 0.2 and 1.07 μg/L. The limit of detection was 0.1μg/mL. The reproducibility of the stripping signal was realized in terms of relative standard deviation for 6 identical measurements and was found to be 2.6%. The effect of interference of different cations and anions on the oxidation of diazepam was studied. Real sample analysis of diazepam was also studied through DPSV.

scholarly journals Controllable Synthesis of h-WO3 Nanoflakes by L-lysine Assisted Hydrothermal Route and Electrochemical Characterization of Nanoflakes Modified Glassy Carbon Electrode

2018 ◽  
Vol 1 (1) ◽  
pp. 7
Author(s):  
Vijaya Kumar Gangaiah ◽  
Ashoka Siddaramanna ◽  
Prashanth Shivappa Adarakatti ◽  
Gujjarahalli Thimanna Chandrappa
Keyword(s):  
Glassy Carbon Electrode ◽  
Glassy Carbon ◽  
Ostwald Ripening ◽  
Electrochemical Impedance ◽  
Hydrothermal Reaction ◽  
Charge Transfer Resistance ◽  
Carbon Electrode ◽  
Modified Glassy Carbon Electrode ◽  
Hydrothermal Route ◽  
Transfer Resistance

<p>Hexagonal tungsten trioxide (h-WO3) nanoflakes have been synthesized by a hydrothermal approach using L-lysine as the shape directing agent. The influence of hydrothermal reaction time and L-lysine content on the morphology of h-WO3 was investigated. The experimental results showed that the nanoflake morphology could be achieved at higher concentration of L-lysine. Based on the evolution of nanoflake morphology as a function of hydro-thermal duration, a “dissolution-crystallization-Ostwald ripening” growth mechanism has been proposed. The electro-chemical performance of h-WO3 nanoflakes has also been investigated by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). It is found that h-WO3 modified glassy carbon electrode (GCE) showed lower charge transfer resistance and enhancement in peak current attributed to the enrichment in electroactive surface area and faster electron transfer kinetics at h-WO3 modified GCE.</p>

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