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.

scholarly journals Conductive Hydrogel-Based Electrochemical Sensor: A Soft Platform for Capturing Analyte

Chemosensors ◽  
2021 ◽  
Vol 9 (10) ◽  
pp. 282
Author(s):  
Li Fu ◽  
Aimin Yu ◽  
Guosong Lai
Keyword(s):  
Electrochemical Sensor ◽  
Electrochemical Sensors ◽  
Rapid Development ◽  
Bioactive Molecules ◽  
Noble Metal Nanoparticles ◽  
Current Status ◽  
Dimensional Structure ◽  
Aqueous Environment ◽  
Practical Applications ◽  
Specific Recognition

Electrode modifications for electrochemical sensors attract a lot of attention every year. Among them, hydrogels are a relatively special class of electrode modifier. Since hydrogels often contain polymers, even though they are conductive polymers, they are not ideal electrode modifiers because of their poor conductivity. However, the micro-aqueous environment and the three-dimensional structure of hydrogels are an excellent platform for immobilizing bioactive molecules and maintaining their activity. This gives the hydrogel-modified electrochemical sensor the potential to perform specific recognition. At the same time, the rapid development of nanomaterials also makes the composite hydrogel have good electrical conductivity. This has led many scientists to become interested in hydrogel-based electrochemical sensors. In this review, we summarize the development process of hydrogel-based electrochemical sensors, starting from 2000. Hydrogel-based electrochemical sensors were initially used only as a carrier for biomolecules, mostly for loading enzymes and for specific recognition. With the widespread use of noble metal nanoparticles and carbon materials, hydrogels can now be used to prepare enzyme-free sensors. Although there are some sporadic studies on the use of hydrogels for practical applications, the vast majority of reports are still limited to the detection of common model molecules, such as glucose and H2O2. In the review, we classify hydrogels according to their different conducting strategies, and present the current status of the application of different hydrogels in electrochemical sensors. We also summarize the advantages and shortcomings of hydrogel-based electrochemical sensors. In addition, future prospects regarding hydrogel for electrochemical sensor use have been provided at the end.

scholarly journals The determination of avidin in genetically modified maize by voltammetric techniques

2008 ◽  
Vol 53 (No. 8) ◽  
pp. 345-349 ◽  
Author(s):  
J. Petrlová ◽  
S. Křížková ◽  
V. Šupálková ◽  
M. Masařík ◽  
V. Adam ◽  
...  
Keyword(s):  
Plant Species ◽  
Electrochemical Sensors ◽  
Genetically Modified ◽  
Modified Carbon Paste Electrode ◽  
Carbon Paste ◽  
Food Ingredients ◽  
Voltammetric Techniques ◽  
Helianthus Annus ◽  
Sensitive Determination

Quality assurance is a major issue in the food industry. The authenticity of food ingredients and their traceability are required by consumers and authorities. Plant species such as barley (<i>Hordeum vulgare</i>), rice (<i>Oryza sativa</i>), sunflower (<i>Helianthus annus</i>), wheat (<i>Triticum aestivum</i>) and maize (<i>Zea mays</i>) are very common objects of interest of genetic modification (GMO); therefore the development of specific assays for their specific detection and quantification of GMO are needed. Furthermore, the production and trade of genetically modified lines from an increasing number of plant species brings about the need for control within research, environmental risk assessment, labeling-legal, and consumers’ information purposes. Electrochemical sensors and biosensors based on modification of working electrode could be suitable tools for these purposes. Here, we report using of an avidin-modified carbon paste electrode for rapid and sensitive determination of avidin in plant extract solution and in a transgenic maize extract. The process could be used to determine avidin concentrations up to 3pM in solution and 170nM in a maize seed extract. Moreover, we applied the method to analyze different maize flours.

scholarly journals Development of a new bisphenol A electrochemical sensor based on a cadmium(ii) porphyrin modified carbon paste electrode

RSC Advances ◽  
2020 ◽  
Vol 10 (53) ◽  
pp. 31740-31747
Author(s):  
Dhouha Jemmeli ◽  
Chadlia Mchiri ◽  
Chérif Dridi ◽  
Habib Nasri ◽  
Eithne Dempsey
Keyword(s):  
Bisphenol A ◽  
Electrochemical Sensor ◽  
Carbon Paste Electrode ◽  
Modified Carbon Paste Electrode ◽  
Carbon Paste ◽  
Bpa Detection ◽  
Paste Electrode

In this study, the (5,10,15,20-tetrakis[(4-methoxyphenyl)]porphyrinato)cadmium(ii) complex ([Cd(TMPP)]) was successfully used as a modifier in a carbon paste electrode (CPE) and exploited for bisphenol A (BPA) detection.

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