scholarly journals Supramolecular Electrochemical Sensor for Dopamine Detection Based on Self-Assembled Mixed Surfactants on Gold Nanoparticles Deposited Graphene Oxide

Molecules ◽  
2020 ◽  
Vol 25 (11) ◽  
pp. 2528 ◽  
Author(s):  
Pikaned Uppachai ◽  
Supalax Srijaranai ◽  
Suta Poosittisak ◽  
Illyas Md Isa ◽  
Siriboon Mukdasai
Keyword(s):  
Gold Nanoparticles ◽  
Graphene Oxide ◽  
Electrochemical Sensor ◽  
Electrochemical Impedance ◽  
Sodium Dodecyl ◽  
Mixed Surfactants ◽  
Serum Samples ◽  
Dopamine Detection ◽  
Self Assembled ◽  
Highly Sensitive Detection

A new supramolecular electrochemical sensor for highly sensitive detection of dopamine (DA) was fabricated based on supramolecular assemblies of mixed two surfactants, tetra-butylammonium bromide (TBABr) and sodium dodecyl sulphate (SDS), on the electrodeposition of gold nanoparticles on graphene oxide modified on glassy carbon electrode (AuNPs/GO/GCE). Self-assembled mixed surfactants (TBABr/SDS) were added into the solution to increase the sensitivity for the detection of DA. All electrodes were characterized by scanning electron microscopy (SEM), cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS). The supramolecular electrochemical sensor (TBABr/SDS⋅⋅⋅AuNPs/GO/GCE) showed excellent electrocatalytic activity toward the oxidation of DA. Under the optimum conditions, the concentration of DA was obtained in the range from 0.02 µM to 1.00 µM, with a detection limit of 0.01 µM (3s/b). The results displayed that TBABr/SDS⋅⋅⋅AuNPs/GO/GCE exhibited excellent performance, good sensitivity, and reproducibility. In addition, the proposed supramolecular electrochemical sensor was successfully applied to determine DA in human serum samples with satisfactory recoveries (97.26% to 104.21%).

Highly sensitive detection of hesperidin using AuNPs/rGO modified glassy carbon electrode

The Analyst ◽  
2018 ◽  
Vol 143 (1) ◽  
pp. 297-303 ◽  
Author(s):  
Yang Gao ◽  
Xiufeng Wu ◽  
Hui Wang ◽  
Wenbo Lu ◽  
Mandong Guo
Keyword(s):  
Gold Nanoparticles ◽  
Graphene Oxide ◽  
Electrochemical Sensor ◽  
Glassy Carbon Electrode ◽  
Glassy Carbon ◽  
Carbon Electrode ◽  
Modified Glassy Carbon Electrode ◽  
Reduced Graphene ◽  
Highly Sensitive ◽  
Highly Sensitive Detection

The highly sensitive and selective electrochemical sensor of hesperidin based on gold nanoparticles (AuNPs) and reduced graphene oxide (rGO) modified glassy carbon electrode (GCE) is reported.

scholarly journals Electrochemical Impedance Characterization of Cell Growth on Reduced Graphene Oxide–Gold Nanoparticles Electrodeposited on Indium Tin Oxide Electrodes

2019 ◽  
Vol 9 (2) ◽  
pp. 326 ◽  
Author(s):  
Somasekhar Chinnadayyala ◽  
Jinsoo Park ◽  
Yonghyun Choi ◽  
Jae-Hee Han ◽  
Ajay Yagati ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Graphene Oxide ◽  
Cell Growth ◽  
Reduced Graphene Oxide ◽  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Electrochemical Impedance ◽  
Hek293 Cells ◽  
Ito Electrode ◽  
Reduced Graphene

The improved binding ability of graphene–nanoparticle composites to proteins or molecules can be utilized to develop new cell-based assays. In this study, we fabricated reduced graphene oxide–gold nanoparticles (rGO-AuNP) electrodeposited onto a transparent indium tin oxide (ITO) electrode and investigated the feasibility of the electrochemical impedance monitoring of cell growth. The electrodeposition of rGO–AuNP on the ITO was optically and electrochemically characterized in comparison to bare, rGO-, and AuNP-deposited electrodes. The cell growth on the rGO–AuNP/ITO electrode was analyzed via electrochemical impedance measurement together with the microscopic observation of HEK293 cells transfected with a green fluorescent protein expression vector. The results showed that rGO–AuNP was biocompatible and induced an increase in cell adherence to the electrode when compared to the bare, AuNP-, or rGO-deposited ITO electrode. At 54 h cultivation, the average and standard deviation of the saturated normalized impedance magnitude of the rGO–AuNP/ITO electrode was 3.44 ± 0.16, while the value of the bare, AuNP-, and rGO-deposited ITO electrode was 2.48 ± 0.15, 2.61 ± 0.18, and 3.01 ± 0.25, respectively. The higher saturated value of the cell impedance indicates that the impedimetric cell-based assay has a broader measurement range. Thus, the rGO–AuNP/ITO electrode can be utilized for label-free and real-time impedimetric cell-based assays with wider dynamic range.

Self-assembled AuNPs on sulphur-doped graphene: a dual and highly efficient electrochemical sensor for nitrite (NO2−) and nitric oxide (NO)

2017 ◽  
Vol 41 (16) ◽  
pp. 8347-8358 ◽  
Author(s):  
Sajad Ahmad Bhat ◽  
Sarwar Ahmad Pandit ◽  
Mudasir Ahmad Rather ◽  
Ghulam Mohd Rather ◽  
Nusrat Rashid ◽  
...  
Keyword(s):  
Nitric Oxide ◽  
Gold Nanoparticles ◽  
Electrochemical Sensor ◽  
Highly Efficient ◽  
Doped Graphene ◽  
Self Assembled

Gold nanoparticles self-assembled over sulphur-doped graphene as a reusable electrocatalyst for selective and sensitive quantification of NO2− and NO.

Molecularly imprinted poly 2-aminophenol-gold nanoparticles-reduced graphene oxide composite for electrochemical determination of flutamide in environmental and biological samples

2021 ◽  
Author(s):  
Mohammad Kadivar ◽  
Alireza Aliakbar
Keyword(s):  
Gold Nanoparticles ◽  
Graphene Oxide ◽  
Electrochemical Sensor ◽  
Reduced Graphene Oxide ◽  
Biological Samples ◽  
Electrochemical Determination ◽  
Molecularly Imprinted ◽  
Reduced Graphene ◽  
Environmental And Biological Samples

A selective and sensitive electrochemical sensor based on reduced graphene oxide, gold nanoparticles, and molecularly imprinted poly 2-aminophenol was developed for electrochemical determination of flutamide in environmental and biological samples....

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