Electrocatalytic redox behavior of graphene films towards acebutolol hydrochloride determination in real samples

2016 ◽  
Vol 40 (4) ◽  
pp. 3763-3772 ◽  
Author(s):  
Atmanand M. Bagoji ◽  
Sharanappa T. Nandibewoor
Keyword(s):  
Glassy Carbon Electrode ◽  
Glassy Carbon ◽  
Limit Of Detection ◽  
Graphene Film ◽  
Carbon Electrode ◽  
Redox Behavior ◽  
Optimal Conditions ◽  
Modified Glassy Carbon Electrode ◽  
Real Samples ◽  
Graphene Films

Under optimal conditions, a graphene film modified glassy carbon electrode exhibited a longer linearity range from 3.36 to 57.12 ng mL−1 of acebutolol with a limit of detection of 0.131 ng mL−1.

scholarly journals Stripping Voltammetric Determination of Analgesics in Their Pharmaceuticals Using Nano-Riboflavin-Modified Glassy Carbon Electrode

2011 ◽  
Vol 2011 ◽  
pp. 1-11 ◽  
Author(s):  
Gopalakrishnan Gopu ◽  
Paramasivam Manisankar ◽  
Baladhandapani Muralidharan ◽  
Chinnapiyan Vedhi
Keyword(s):  
Glassy Carbon Electrode ◽  
Glassy Carbon ◽  
Limit Of Detection ◽  
Pharmaceutical Preparations ◽  
Sem Analysis ◽  
Carbon Electrode ◽  
Modified Glassy Carbon Electrode ◽  
Diffusion Controlled ◽  
Influence Of Ph

Cyclic voltammetric behaviors of three analgesics, acetaminophen (AAP), acetylsalicylic acid (ASA), and dipyrone (DP), were studied using nano-riboflavin-modified glassy carbon electrode. One well-defined oxidation peak each for AAP and ASA and three oxidation peaks for DP were observed. The influence of pH, scan rate, and concentration reveals irreversible diffusion controlled reaction. The SEM analysis confirmed good accumulation of the drugs on the electrode surface. Calibration was made under the maximum peak current conditions. The concentration range studied for the determination of drugs was 0.02 to 0.4 μg mL−1for AAP and ASA and 0.025 to 0.4 μg mL−1for DP. The lower limit of detection observed for AAP, ASA, and DP was 0.016, 0.007 μg mL−1, and 0.013 μg mL−1, respectively. The suitability of the method for the determination of these analgesics in pharmaceutical preparations and urine samples was also ascertained.

PAn/Cu Bismuthate Nanoflake Composites with Enhanced Electrochemical Performance for TA

2020 ◽  
Vol 12 (1) ◽  
pp. 48-57 ◽  
Author(s):  
Z. Wang ◽  
H.J. Chen ◽  
F.F. Lin ◽  
L. Yan ◽  
Y. Zhang ◽  
...  
Keyword(s):  
Cyclic Voltammetry ◽  
Electrochemical Performance ◽  
Tartaric Acid ◽  
Glassy Carbon Electrode ◽  
Glassy Carbon ◽  
Limit Of Detection ◽  
Carbon Electrode ◽  
Modified Glassy Carbon Electrode ◽  
Enhanced Electrochemical Performance

Background: Measuring tartaric acid in liquid food, such as fruits or fruit products is of great importance for assessing the quality of the food. Objective: The aim of the research is to obtain polyaniline/Cu bismuthate nanoflake composites by an in-situ polymerization route for the electrochemical detection of tartaric acid. Methods: Polyaniline/Cu bismuthate nanoflake composites were prepared by in-situ aniline polymerizing route in aqueous solution. The obtained products were characterized by X-Ray diffraction (XRD), Transmission Electron Microscopy (TEM) and high-resolution TEM (HRTEM), respectively. The electrochemical performance for tartaric acid detection has been investigated by cyclic voltammetry method using polyaniline/Cu bismuthate nanoflake composites modified glassy carbon electrode. Results: The nanocomposites comprise of tetragonal CuBi2O4 phase. Polyaniline particles with the size of less than 100 nm attach to the surface of the nanoflakes. A pair of quasi-reversible cyclic voltammetry peaks are located at -0.01 V and +0.04 V, respectively at the 20wt.% polyaniline/Cu bismuthate nanoflake composites modified glassy carbon electrode. The limit of detection is 0.58 µM with the linear range of 0.001-2 mM. The linear range increases from 0.005-2 mM to 0.001-2 mM and limit of detection decreases from 2.3 µM to 0.43 µM with increasing the polyaniline content from 10wt.% to 40wt.%. Conclusion: Comparing with the Cu bismuthate nanoflakes modified glassy carbon electrode, polyaniline/ Cu bismuthate nanoflake composites modified glassy carbon electrode shows enhanced electrochemical performance for tartaric acid detection.

Layered double hydroxide nanoparticles embedded in a biopolymer: a novel platform for electroanalytical determination of diazepam

2019 ◽  
Vol 43 (19) ◽  
pp. 7463-7470 ◽  
Author(s):  
Roghayeh Amini ◽  
Karim Asadpour-Zeynali
Keyword(s):  
Glassy Carbon Electrode ◽  
Layered Double Hydroxide ◽  
Glassy Carbon ◽  
Carbon Electrode ◽  
Modified Glassy Carbon Electrode ◽  
Real Samples ◽  
Double Hydroxide ◽  
Electrocatalytic Determination ◽  
Layered Double Hydroxide Nanoparticles

A Co–Al layered double hydroxide/poly(tyrosine) modified glassy carbon electrode was prepared and used for electrocatalytic determination of diazepam in real samples.

scholarly journals Copper Film Modified Glassy Carbon Electrode and Copper Film with Carbon Nanotubes Modified Screen-Printed Electrode for the Cd(II) Determination

Materials ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5148
Author(s):  
Joanna Wasąg ◽  
Malgorzata Grabarczyk
Keyword(s):  
Carbon Nanotubes ◽  
Glassy Carbon Electrode ◽  
Glassy Carbon ◽  
Limit Of Detection ◽  
Copper Film ◽  
Carbon Electrode ◽  
Modified Glassy Carbon Electrode ◽  
Screen Printed Electrode ◽  
Accumulation Time ◽  
Screen Printed

A copper film modified glassy carbon electrode (CuF/GCE) and a novel copper film with carbon nanotubes modified screen-printed electrode (CuF/CN/SPE) for anodic stripping voltammetric measurement of ultratrace levels of Cd(II) are presented. During the development of the research procedure, several main parameters were investigated and optimized. The optimal electroanalytical performance of the working electrodes was achieved in electrolyte 0.1 M HCl and 2 × 10−4 M Cu(II). The copper film modified glassy carbon electrode exhibited operation in the presence of dissolved oxygen with a calculated limit of detection of 1.7 × 10−10 M and 210 s accumulation time, repeatability with RSD of 4.2% (n = 5). In the case of copper film with carbon nanotubes modified screen-printed electrode limit of detection amounted 1.3 × 10−10 M for accumulation time of 210 s and with RSD of 4.5% (n = 5). The calibration curve has a linear range in the tested concentration of 5 × 10−10–5 × 10−7 M (r = 0.999) for CuF/GCE and 3 × 10−10–3 × 10−7 M (r = 0.999) for CuF/CN/SPE with 210 s accumulation time in both cases. The used electrodes enable trace determination of cadmium in different environmental water samples containing organic matrix. The validation of the proposed procedures was carried out through analysis certified reference materials: TM-25.5, SPS-SW1, and SPS-WW1.

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.

Electrochemical Determination of Paracetamol at Poly(3-Methylthiophene)/Reduced Graphene Oxide Modified Glassy Carbon Electrode

NANO ◽  
2018 ◽  
Vol 13 (09) ◽  
pp. 1850104 ◽  
Author(s):  
Caiwei Li ◽  
Weimeng Si ◽  
Yuting Wu ◽  
Cheng Zhang ◽  
Wu Lei ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Glassy Carbon Electrode ◽  
Glassy Carbon ◽  
Limit Of Detection ◽  
Differential Pulse ◽  
Carbon Electrode ◽  
Modified Glassy Carbon Electrode ◽  
Buffer Solution ◽  
Reduced Graphene

Poly(3-methylthiophene)/reduced graphene oxide (P3MT/RGO) modified glassy carbon electrode (GCE) was fabricated via a facile procedure. P3MT was directly electrodeposited on the RGO coated electrode and employed for the electrochemical detection of paracetamol (PCT). The morphology of composite was characterized by scanning electron microscopy (SEM). Cyclic voltammetry (CV) and differential pulse voltammetry (DPV) were used to investigate the electrochemical behaviors of PCT on P3MT/RGO/GCE. Experimental parameters, such as the scan rates, polymerization laps and the pH of buffer solution were optimized. Under the optimal conditions, the anodic peak current in DPVs varies linearly with the concentration of PCT, and the limit of detection was 0.025[Formula: see text][Formula: see text]M. Moreover, the proposed P3MT/RGO/GCE also exhibited superior stability and reproducibility.

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