scholarly journals A Simple, Low-Cost and Efficient β-CD/MWCNTs/CP-based Electrochemical Sensor for the Rapid and Sensitive Detection of Methyl Parathion

2019 ◽  
pp. 9785-9795 ◽  
Author(s):  
Runqiang Liu ◽  
Keyword(s):  
Electrochemical Sensor ◽  
Methyl Parathion ◽  
Low Cost ◽  
Sensitive Detection

Graphene Modified Molecular Imprinting Electrochemical Sensor for Determining the Content of Dopamine

2019 ◽  
Vol 15 (6) ◽  
pp. 628-634
Author(s):  
Rong Liu ◽  
Jie Li ◽  
Tongsheng Zhong ◽  
Liping Long
Keyword(s):  
Electrochemical Sensor ◽  
Molecular Imprinting ◽  
Neurological Disorders ◽  
Room Temperature ◽  
Low Cost ◽  
Differential Pulse ◽  
Current Response ◽  
Specific Selectivity ◽  
Pulse Voltammetry

Background: The unnatural levels of dopamine (DA) result in serious neurological disorders such as Parkinson’s disease. Electrochemical methods which have the obvious advantages of simple operation and low-cost instrumentation were widely used for determination of DA. In order to improve the measurement performance of the electrochemical sensor, molecular imprinting technique and graphene have always been employed to increase the selectivity and sensitivity. Methods: An electrochemical sensor which has specific selectivity to (DA) was proposed based on the combination of a molecular imprinting polymer (MIP) with a graphene (GR) modified gold electrode. The performance and effect of MIP film were investigated by differential pulse voltammetry (DPV) and cyclic voltammetry (CV) in the solution of 5.0 ×10-3 mol/L K3[Fe(CN)6] and K4[Fe(CN)6] with 0.2 mol/L KCl at room temperature. Results: This fabricated sensor has well repeatability and stability, and was used to determine the dopamine of urine. Under the optimized experiment conditions, the current response of the imprinted sensor was linear to the concentration of dopamine in the range of 1.0×10-7 ~ 1.0×10-5 mol/L, the linear equation was I (µA) = 7.9824+2.7210lgc (mol/L) with the detection limit of 3.3×10-8 mol/L. Conclusion: In this work, a highly efficient sensor for determination of DA was prepared with good sensitivity by GR and great selectivity of high special recognization ability by molecular imprinting membrane. This proposed sensor was used to determine the dopamine in human urine successfully.

scholarly journals Applicability of Cork as Novel Modifiers to Develop Electrochemical Sensor for Caffeine Determination

Materials ◽  
2020 ◽  
Vol 14 (1) ◽  
pp. 37
Author(s):  
Mayra K. S. Monteiro ◽  
Djalma R. Da Silva ◽  
Marco A. Quiroz ◽  
Vítor J. P. Vilar ◽  
Carlos A. Martínez-Huitle ◽  
...  
Keyword(s):  
Electrochemical Sensor ◽  
Linear Response ◽  
High Performance ◽  
Low Cost ◽  
Pharmaceutical Formulations ◽  
Caffeine Concentration ◽  
Real Samples ◽  
Wide Range ◽  
Potential Use

This study aims to investigate the applicability of a hybrid electrochemical sensor composed of cork and graphite (Gr) for detecting caffeine in aqueous solutions. Raw cork (RAC) and regranulated cork (RGC, obtained by thermal treatment of RAC with steam at 380 °C) were tested as modifiers. The results clearly showed that the cork-graphite sensors, GrRAC and GrRGC, exhibited a linear response over a wide range of caffeine concentration (5–1000 µM), with R2 of 0.99 and 0.98, respectively. The limits of detection (LOD), estimated at 2.9 and 6.1 µM for GrRAC and GrRGC, suggest greater sensitivity and reproducibility than the unmodified conventional graphite sensor. The low-cost cork-graphite sensors were successfully applied in the determination of caffeine in soft drinks and pharmaceutical formulations, presenting well-defined current signals when analyzing real samples. When comparing electrochemical determinations and high performance liquid chromatography measurements, no significant differences were observed (mean accuracy 3.0%), highlighting the potential use of these sensors to determine caffeine in different samples.

scholarly journals A Nanometer-Sized Graphite/Boron-Doped Diamond Electrochemical Sensor for Sensitive Detection of Acetaminophen

ACS Omega ◽  
2021 ◽  
Vol 6 (9) ◽  
pp. 6326-6334
Author(s):  
Peng Wang ◽  
Xiaoxi Yuan ◽  
Zheng Cui ◽  
Chunyan Xu ◽  
Zhaolong Sun ◽  
...  
Keyword(s):  
Electrochemical Sensor ◽  
Sensitive Detection ◽  
Boron Doped Diamond ◽  
Boron Doped

Highly sensitive detection of Cr(vi) in groundwater by bimetallic NiFe nanoparticles

2017 ◽  
Vol 9 (6) ◽  
pp. 1031-1037 ◽  
Author(s):  
Jingtao Liu ◽  
Yu Ding ◽  
Lifei Ji ◽  
Xin Zhang ◽  
Fengchun Yang ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Hexavalent Chromium ◽  
Low Cost ◽  
High Sensitivity ◽  
Sensitive Detection ◽  
Toxic Heavy Metal ◽  
Metal Pollutants ◽  
Highly Sensitive ◽  
Highly Sensitive Detection ◽  
Heavy Metal Pollutants

Hexavalent chromium (Cr(vi)) is one of the most toxic heavy metal pollutants in groundwater, and thus the detection of Cr(vi) with high sensitivity, accuracy, and simplicity and low cost is of great importance.

High performance Pb (II) electrochemical sensor based on spherical CuS nanoparticles anchored g-C3N4

2021 ◽  
Author(s):  
Jingheng Ning ◽  
Jiaqian Wei ◽  
Shouen Huang ◽  
Faxiang Wang ◽  
xin luo ◽  
...  
Keyword(s):  
Electrochemical Sensor ◽  
Copper Sulfide ◽  
High Performance ◽  
Carbon Nitride ◽  
Anodic Stripping Voltammetry ◽  
Stripping Voltammetry ◽  
Graphitic Carbon ◽  
Graphitic Carbon Nitride ◽  
Sensitive Detection ◽  
Anodic Stripping

A new electrochemical sensor has been constructed for ultra-sensitive detection of lead ions (Pb2+) by square wave anodic stripping voltammetry (SWASV), based on copper sulfide/graphitic carbon nitride nanocomposite modified glassy...

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