scholarly journals A new zinc complex of 1-propyl-1H-benzo[d] imidazole: synthesis, characterization and electrocatalysis

2010 ◽  
Vol 8 (3) ◽  
pp. 646-651
Author(s):  
Rui Zhuang ◽  
Fang Jian ◽  
KeFei Wang
Keyword(s):  
Detection Limit ◽  
Trichloroacetic Acid ◽  
Zinc Complex ◽  
Modified Carbon Paste Electrode ◽  
Carbon Paste ◽  
Tetrahedral Geometry ◽  
Rapid Preparation ◽  
Practical Applications ◽  
X Ray Crystallography ◽  
And Performance

AbstractThe present work reports the synthesis, characterization and performance of a new zinc(II) complex of [Zn(C3H7-bim)2Br2] (bim = benzimidazole) as electrocatalyst for trichloroacetic acid and bromate reduction. Its structure was characterized by X-ray crystallography, IR spectroscopy and elemental analysis. The zinc atom adopts a distorted tetrahedral geometry by coordinating to two bromine atoms and two nitrogen atoms from two 1-propyl-1H-benzo[d]imidazole ligands. The electrochemical behavior and electrocatalysis of the zinc complex bulk-modified carbon paste electrode (Zn-CPE) have been studied by cyclic voltammetry. The Zn-CPE shows good electrocatalytic activities toward the reduction of trichloroacetic acid and bromate. The detection limit and the sensitivity are 0.05 μM, 67.43 μA μM−1 for trichloroacetic acid detection, and 0.02 μM, 69.94 μA μM−1 for bromate detection, respectively. This modified electrode shows good reproducibility, high stability, low detection limit, technical simplicity and possibility of rapid preparation, which is important for practical applications.

New cobalt(II)-based electrocatalyst for reduction of trichloroacetic acid and bromate

2010 ◽  
Vol 75 (6) ◽  
pp. 637-647 ◽  
Author(s):  
Rui Rui Zhuang ◽  
Fang Fang Jian ◽  
Ke Fei Wang
Keyword(s):  
Detection Limit ◽  
Trichloroacetic Acid ◽  
Carbon Powder ◽  
Carbon Paste ◽  
Rapid Preparation ◽  
Practical Applications ◽  
X Ray Crystallography ◽  
Mixing Method ◽  
Technical Simplicity ◽  
Paste Electrode

A novel cobalt(II) complex trans-[Co(C6H11N3)4(SCN)2] (C6H11N3 = 1-butyl-1H-1,2,4-triazole) was synthesized and characterized by X-ray crystallography, IR spectroscopy and elemental analysis. The cobalt center is six-coordinate, CoIIN6, the axial positions being occupied by the isothiocyanate ligands and the equatorial positions by the 1-butyl-1H-1,2,4-triazole ligands. A conductive carbon paste electrode (Co-CPE), comprised of the studied complex and a carbon powder, was fabricated by the direct mixing method. The electrochemical behavior and electrocatalytic performance of Co-CPE were studied by cyclic voltammetry. The Co-CPE shows electrocatalytic activities toward the reduction of trichloroacetic acid and bromate. The detection limit and sensitivity are 0.01 μmol dm–3 and 76.86 μA μmol–1 dm3 for trichloroacetic acid, and 0.02 μmol dm–3 and 96.19 μA μmol–1 dm3 for bromate, respectively. The modified electrode features good reproducibility, high stability, low detection limit, technical simplicity and rapid preparation, which is important for practical applications.

Microwave-assisted synthesis of NaA nanozeolite from slag and performance of Ag-doped nanozeolite as an efficient material for determination of hydrogen peroxide

RSC Advances ◽  
2016 ◽  
Vol 6 (57) ◽  
pp. 52058-52066 ◽  
Author(s):  
Seyed Naser Azizi ◽  
Shahram Ghasemi ◽  
Mehrnaz Mikhchian
Keyword(s):  
Hydrogen Peroxide ◽  
Phosphate Buffer Solution ◽  
Modified Carbon Paste Electrode ◽  
Microwave Assisted Synthesis ◽  
Carbon Paste ◽  
Buffer Solution ◽  
Microwave Assisted ◽  
And Performance ◽  
Paste Electrode

A new amperometric sensor is prepared based on a Ag doped NaA nanozeolite modified carbon paste electrode (Ag/ACPE) in order to detect hydrogen peroxide (H2O2) in phosphate buffer solution (PBS, pH 7.0).

scholarly journals Fabrication of Au Nanoparticle-Decorated MoS2 Nanoslices as Efficient Electrocatalysts for Electrochemical Detection of Dopamine

Catalysts ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 653 ◽  
Author(s):  
Chen ◽  
Chen ◽  
Hong
Keyword(s):  
Electrochemical Sensor ◽  
High Efficiency ◽  
Electrochemical Sensors ◽  
Au Nanoparticle ◽  
Dimensional Structure ◽  
Modified Carbon Paste Electrode ◽  
High Catalytic Activity ◽  
Carbon Paste ◽  
Practical Applications ◽  
Electrocatalytic Effect

Herein, MoS2 nanoslices were simply prepared by using ultrasonic treatment, and were further decorated with Au nanoparticles (AuNPs) through an electrodeposition process to obtain the MoS2/Au nanocomposites. The obtained nanocomposites display synergetic electrocatalytic effect for the oxidation of dopamine due to the large surface area and two-dimensional structure of the MoS2 nanoslices, combining with the high catalytic activity and good conductivity of AuNPs. An electrochemical sensor was constructed based on MoS2/Au-modified carbon paste electrode, for sensitive and quantitative determination of dopamine. The prepared electrochemical sensor proves excellent analytical performances: very high sensitivity, wide linear ranges (0.5–300 μM), and low detection limit (76 nM). Moreover, the dopamine sensor also displays high selectivity, good reproducibility and stability, and can be used in real sample analysis. The method of fabricating high-efficiency electrocatalysts and electrochemical sensors proposed in this study provides a good reference for developing more functionalized nanocomposites and for extending practical applications.

Electrochemical Inspection of the Interaction of Double Strand ds-DNA with Carmine on Nanometer TiO2 Doped Carbon Paste Electrode

2011 ◽  
Vol 287-290 ◽  
pp. 37-42
Author(s):  
Ming Ming Ma ◽  
Zhi Tong ◽  
Jia Biao Yang
Keyword(s):  
Detection Limit ◽  
Carbon Paste Electrode ◽  
Azo Dye ◽  
Electrochemical Method ◽  
Fluorescence Spectra ◽  
Modified Carbon Paste Electrode ◽  
Oxidation Peak ◽  
Carbon Paste ◽  
Fish Sperm ◽  
Paste Electrode

The interaction of the single azo dye, carmine with fish-sperm dsDNA is inspected in pH 3.2 H2SO4with electrochemical method on the surface of nanometer TiO2modified carbon paste electrode. After the addition of dsDNA, the peak currents of oxidation and reduction peaks of carmine decrease with a positive shift of potential, indicating that intercalation interaction between the dye and dsDNA is taken place. This is consistent with fluorescence spectra results. The binding constant and binding ratio is calculated as 4.92×108and 1:2, respectively. Furthermore, the decrease in the oxidation peak currents is found proportional to dsDNA concentration in the range of 21.24-127.44 μg·mL-1 with a detection limit of 16.04 μg•mL-1.

scholarly journals Voltammetric Determination of Pb(II) by a Ca-MOF-Modified Carbon Paste Electrode Integrated in a 3D-Printed Device

Sensors ◽  
2020 ◽  
Vol 20 (16) ◽  
pp. 4442 ◽  
Author(s):  
Evaggelia Vlachou ◽  
Antigoni Margariti ◽  
Giannis S. Papaefstathiou ◽  
Christos Kokkinos
Keyword(s):  
Carbon Paste Electrode ◽  
Limit Of Detection ◽  
Metal Organic Framework ◽  
Modified Carbon Paste Electrode ◽  
Fish Feed ◽  
Carbon Paste ◽  
Operational Parameters ◽  
Practical Applications ◽  
3D Printed ◽  
Paste Electrode

In this work, a voltammetric method based on a metal organic framework (Ca-MOF)-modified carbon paste electrode for lead determination was developed. The MOF-based electrode was packed in a new type of 3D-printed syringe-type integrated device, which was entirely fabricated by a dual extruder 3D printer. After optimization of the operational parameters, a limit of detection of 0.26 µg L−1 Pb(II) was achieved, which is lower than that of existing MOF-based lead sensors. The device was used for Pb(II) determination in fish feed and bottled water samples with high accuracy and reliability. The proposed sensor is suitable for on-site analyses and provides a low-cost integrated transducer for the ultrasensitive routine detection of lead in practical applications.

Label-Free Electrochemical Detection of DNA Hybridization Related to Anthrax Lethal Factor by using Carbon Nanotube Modified Sensors

2019 ◽  
Vol 15 (4) ◽  
pp. 502-510 ◽  
Author(s):  
Hakan Karadeniz ◽  
Arzum Erdem
Keyword(s):  
Detection Limit ◽  
Dna Hybridization ◽  
Lethal Factor ◽  
Modified Electrodes ◽  
Label Free ◽  
Carbon Paste ◽  
Chip Technology ◽  
Anthrax Lethal Factor ◽  
Hybridization Time ◽  
Electrochemical Monitoring

Background: Anthrax Lethal Factor (ANT) is the dominant virulence factor produced by B. anthracis and is the major cause of death of infected animals. In this paper, pencil graphite electrodes GE were modified with single-walled and multi-walled carbon nanotubes (CNTs) for the detection of hybridization related to the ANT DNA for the first time in the literature. Methods: The electrochemical monitoring of label-free DNA hybridization related to ANT DNA was explored using both SCNT and MCNT modified PGEs with differential pulse voltammetry (DPV). The performance characteristics of ANT-DNA hybridization on disposable GEs were explored by measuring the guanine signal in terms of optimum analytical conditions; the concentration of SCNT and MCNT, the concentrations of probe and target, and also the hybridization time. Under the optimum conditions, the selectivity of probe modified electrodes was tested and the detection limit was calculated. Results: The selectivity of ANT probes immobilized onto MCNT-GEs was tested in the presence of hybridization of probe with NC no response was observed and with MM, smaller responses were observed in comparison to full-match DNA hybridization case. Even though there are unwanted substituents in the mixture samples containing both the target and NC in the ratio 1:1 and both the target and MM in the ratio 1:1, it has been found that ANT probe immobilized CNT modified graphite sensor can also select its target by resulting with 20.9% decreased response in comparison to the one measured in the case of full-match DNA hybridization case Therefore, it was concluded that the detection of direct DNA hybridization was performed by using MCNT-GEs with an acceptable selectivity. Conclusion: Disposable SCNT/MCNT modified GEs bring some important advantages to our assay including easy use, cost-effectiveness and giving a response in a shorter time compared to unmodified PGE, carbon paste electrode and glassy carbon electrode developed for electrochemical monitoring of DNA hybridization. Consequently, the detection of DNA hybridization related to the ANT DNA by MCNT modified sensors was performed by using lower CNT, probe and target concentrations, in a shorter hybridization time and resulting in a lower detection limit according to the SCNT modified sensors. In conclusion, MCNT modified sensors can yield the possibilities leading to the development of nucleic acid sensors platforms for the improvement of fast and cost-effective detection systems with respect to DNA chip technology.

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