scholarly journals An Electrochemical Sensor Based on Gold Nanodendrite/Surfactant Modified Electrode for Bisphenol A Detection

2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Nguyen Thi Lien ◽  
Le Quoc Hung ◽  
Nguyen Tien Hoang ◽  
Vu Thi Thu ◽  
Dau Thi Ngoc Nga ◽  
...  
Keyword(s):  
Bisphenol A ◽  
Electrochemical Sensors ◽  
Differential Pulse ◽  
Electrochemical Sensing ◽  
Fluorescence Measurements ◽  
Sensing Platform ◽  
Electrochemical Window ◽  
Galvanostatic Deposition ◽  
Bisphenol A Detection ◽  
Good Agreement

In the present work, we reported the simple way to fabricate an electrochemical sensing platform to detect Bisphenol A (BPA) using galvanostatic deposition of Au on a glassy carbon electrode covered by cetyltrimethylammonium bromide (CTAB). This material (CTAB) enhances the sensitivity of electrochemical sensors with respect to the detection of BPA. The electrochemical response of the modified GCE to BPA was investigated by cyclic voltammetry and differential pulse voltammetry. The results displayed a low detection limit (22 nm) and a linear range from 0.025 to 10 µm along side with high reproducibility (RSD = 4.9% for seven independent sensors). Importantly, the prepared sensors were selective enough against interferences with other pollutants in the same electrochemical window. Notably, the presented sensors have already proven their ability in detecting BPA in real plastic water drinking bottle samples with high accuracy (recovery range = 96.60%–102.82%) and it is in good agreement with fluorescence measurements.

scholarly journals Nanoelectrode Arrays Fabricated by Thermal Nanoimprint Lithography for Biosensing Application

Biosensors ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 90
Author(s):  
Alessandra Zanut ◽  
Alessandro Cian ◽  
Nicola Cefarin ◽  
Alessandro Pozzato ◽  
Massimo Tormen
Keyword(s):  
Nanoimprint Lithography ◽  
Electrochemical Sensors ◽  
Low Cost ◽  
Scale Up ◽  
Electrochemical Sensing ◽  
Electrical Measurements ◽  
Boron Doped Diamond ◽  
Sensing Platform ◽  
Increased Sensitivity ◽  
Gliadin Protein

Electrochemical sensors are devices capable of detecting molecules and biomolecules in solutions and determining the concentration through direct electrical measurements. These systems can be miniaturized to a size less than 1 µm through the creation of small-size arrays of nanoelectrodes (NEA), offering advantages in terms of increased sensitivity and compactness. In this work, we present the fabrication of an electrochemical platform based on an array of nanoelectrodes (NEA) and its possible use for the detection of antigens of interest. NEAs were fabricated by forming arrays of nanoholes on a thin film of polycarbonate (PC) deposited on boron-doped diamond (BDD) macroelectrodes by thermal nanoimprint lithography (TNIL), which demonstrated to be a highly reliable and reproducible process. As proof of principle, gliadin protein fragments were physisorbed on the polycarbonate surface of NEAs and detected by immuno-indirect assay using a secondary antibody labelled with horseradish peroxidase (HRP). This method allows a successful detection of gliadin, in the range of concentration of 0.5–10 μg/mL, by cyclic voltammetry taking advantage from the properties of NEAs to strongly suppress the capacitive background signal. We demonstrate that the characteristics of the TNIL technology in the fabrication of high-resolution nanostructures together with their low-cost production, may allow to scale up the production of NEAs-based electrochemical sensing platform to monitor biochemical molecules for both food and biomedical applications.

Magnetically induced self-assembly DNAzyme electrochemical biosensor based on gold-modified α-Fe2O3/Fe3O4 heterogeneous nanoparticles for sensitive detection of Ni2+

2021 ◽  
Author(s):  
Lulu Yu ◽  
Min Liu ◽  
Yanling Zhang ◽  
Yun Ni ◽  
Shaobo Wu ◽  
...  
Keyword(s):  
Self Assembly ◽  
Electrochemical Biosensor ◽  
Limit Of Detection ◽  
Sol Gel ◽  
Trisodium Citrate ◽  
Thiol Group ◽  
Differential Pulse ◽  
Electrochemical Sensing ◽  
Detection Range ◽  
Sensing Platform

Abstract A magnetically induced self-assembly DNAzyme electrochemical biosensor based on gold-modified α-Fe2O3/Fe3O4 heterogeneous nanoparticles was successfully fabricated to detect Nickel(II) (Ni2+). The phase composition and magnetic properties of α-Fe2O3/Fe3O4 heterogeneous nanoparticles controllably prepared by the citric acid (CA) sol-gel method were investigated in detail. The α-Fe2O3/Fe3O4 heterogeneous nanoparticles were modified by using trisodium citrate as reducing agent, and the magnetically induced self-assembly α-Fe2O3/Fe3O4-Au nanocomposites were obtained. The designed Ni2+-dependent DNAzyme consisted of the catalytic chain modified with the thiol group (S1-SH) and the substrate chain modified with methylene blue (S2-MB). The MGCE/α-Fe2O3/Fe3O4-Au/S1/BSA/S2 electrochemical sensing platform was constructed and differential pulse voltammetry (DPV) was applied for electrochemical detection. Under the optimum experimental parameters, the detection range of the biosensor was 100 pM-10 µM (R2= 0.9978) with the limit of detection (LOD) of 55 pM. The biosensor had high selectivity, acceptable stability, and reproducibility (RSD = 4.03%).

scholarly journals A Robust Electrochemical Sensor for Determination of ThiamethoxamBased on Electrochemical Reduced Graphene Oxide-Cationic Pillar[6]arene Composite Film

2021 ◽  
Author(s):  
Yanju Wu ◽  
Zikang Li ◽  
Dongyang Han ◽  
Qunpeng Duan ◽  
Fei Wang
Keyword(s):  
Graphene Oxide ◽  
Composite Film ◽  
Reduced Graphene Oxide ◽  
Differential Pulse ◽  
Potential Method ◽  
Electrochemical Sensing ◽  
Sensing Platform ◽  
Reduced Graphene ◽  
Electrochemically Reduced Graphene Oxide

Abstract On the surface of a glassy carbon electrode, electrochemically reduced graphene oxide-cationic pillar[6]arene (ErGO-CP6) composite film was constructed using a pulsed potential method. UV-vis spectra, SEM, Raman spectra and electrochemical experiments were applied to characterize the composite film. It was then used as a new electrochemical sensing platform for determination of thiamethoxam. Due to the synergistic effect of ErGO and CP6, this composite film shows a higher sensitivity and better selectivity toward thiamethoxam than that of ErGO film. The linear range from 1.0 × 10-7 to 1.3 × 10-5 mol L-1 was obtained by differential pulse voltammetry. Meanwhile, the method was applied to cucumber and tomato samples in a recovery test. The recovery was between 92.0% and 98.7%, and the results are satisfactory. This study presents a promising electrochemical sensing platform for rapid and sensitive analysis of thiamethoxam.

Simultaneous Electrochemical Detection of Ascorbic Acid, Dopamine and Uric Acid Using the Composite Materials of Fe3O4 and Nitrogen Self-Doped Sunflower Plate-Derived Carbon

NANO ◽  
2021 ◽  
Author(s):  
Panpan Gao ◽  
Yaqi Huang ◽  
Yaoyao Zhang ◽  
Qiaoqian Sun ◽  
Shaojie Ruan ◽  
...  
Keyword(s):  
Ascorbic Acid ◽  
Uric Acid ◽  
Composite Materials ◽  
Electrochemical Sensors ◽  
Differential Pulse ◽  
Research Direction ◽  
Electrochemical Sensing ◽  
Normal Human ◽  
Target Molecules ◽  
New Research

A simple pyrolysis, activation and hydrothermal method was utilized to synthesize composite materials (Fe3O4/SFP) of ferroferric oxide and nitrogen self-doped sunflower plate-derived carbon for the simultaneous electrochemical sensing of ascorbic acid (AA), dopamine (DA) and uric acid (UA). The Fe3O4/SFP had synergistic catalytic effect on target molecules, and the oxidation peak potential of AA, DA and UA was well distinguished in the differential pulse voltammetry determination. Under the optimal conditions, the linear response ranges of AA, DA and UA are 3–150[Formula: see text][Formula: see text]M, 5–450[Formula: see text][Formula: see text]M and 15–1200[Formula: see text][Formula: see text]M, respectively. The detection limits of AA, DA and UA ([Formula: see text]/[Formula: see text]) are 1.0[Formula: see text][Formula: see text]M, 0.4[Formula: see text][Formula: see text]M and 1.48[Formula: see text][Formula: see text]M, respectively, and the sensitivity is 1.87[Formula: see text][Formula: see text] (3–20[Formula: see text][Formula: see text]M) and 0.64[Formula: see text][Formula: see text] (20–150[Formula: see text][Formula: see text]M) for AA, 3.90[Formula: see text][Formula: see text] (5–20[Formula: see text][Formula: see text]M) and 1.21[Formula: see text][Formula: see text] (20–450[Formula: see text][Formula: see text]M) for DA and 1.12[Formula: see text][Formula: see text] (15–100[Formula: see text][Formula: see text]M) and 0.31[Formula: see text][Formula: see text] (100–1200[Formula: see text][Formula: see text]M) for UA. In addition, satisfactory results have been obtained for the determination of AA, DA and UA in normal human serum, which provides a new research direction for the construction of electrochemical sensors in the future.

Novel electroanalytical platform based on bimetallic oxide nanospheres for the sensitive determination of Rhodamine B

2014 ◽  
Vol 92 (7) ◽  
pp. 640-646 ◽  
Author(s):  
Junyong Sun ◽  
Tian Gan ◽  
Cui Yang ◽  
Zhaoxia Shi ◽  
Kejing Huang ◽  
...  
Keyword(s):  
Nickel Oxide ◽  
Rhodamine B ◽  
Differential Pulse ◽  
Food Samples ◽  
Electrochemical Sensing ◽  
Cobalt Nickel ◽  
Sensing Platform ◽  
Sensitive Determination ◽  
Cobalt Nickel Oxide

In this work, uniform cobalt and nickel bimetallic oxides were formed by calcining the carbon templates, which were then modified on a glassy carbon electrode (cobalt–nickel oxide/GCE) as a novel system for the preparation of an electrochemical sensing platform. The electrochemical oxidation behavior of Rhodamine B (RB) at the cobalt–nickel oxide/GCE was investigated using differential pulse voltammetry under optimal conditions; the high electrocatalytic activity of the modified electrode toward analysis of RB was indicated. In addition, a linear range of 0.03−1.0 μmol L–1 and a low detection limit of 5.3 nmol L–1 (S/N = 3) for RB detection were obtained. Finally, the developed method with good stability and sensitivity was successfully applied for RB determination in food samples extract.

scholarly journals Electrochemical sensing platform for simultaneous detection of 6-mercaptopurine and 6-thioguanine using RGO-Cu2O/Fe2O3 modified screen-printed graphite electrode

2021 ◽  
Author(s):  
Fatemeh Irannezhad ◽  
Jamileh Seyed-Yazdi ◽  
Seyedeh Hoda Hekmatara
Keyword(s):  
Dynamic Range ◽  
Graphite Electrode ◽  
Limit Of Detection ◽  
Simultaneous Detection ◽  
Differential Pulse ◽  
Electrochemical Sensing ◽  
X Ray Diffraction ◽  
Sensing Platform ◽  
Facile Fabrication ◽  
Screen Printed

A sensitive electrochemical sensor was developed using reduced graphene oxide RGO-Cu2O/Fe2O3 nanocomposite for 6-mercaptopurine detection based on a facile fabrication method. The surface morphology and structural composition of this nanocomposite was evaluated by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), and Fourier transform infrared (FT-IR) spectroscopy. The screen-printed graphite electrode (SPGE) modified with RGO-Cu2O/Fe2O3 nanocomposite (RGO-Cu2O/Fe2O3/SPGE) indicated excellent electrochemical properties to detect 6-mercaptopurine. The linear dynamic range was estimated between 0.05 and 400.0 μM for 6-mercaptopurine detection, with a limit of detection of 0.03 μM. Also, RGO-Cu2O/Fe2O3/SPGE sensor showed good activity for simultaneous detection of 6-mercaptopurine and 6-thioguanine. In the coexistence system of 6-mercaptopurine and 6-thioguanine, two clear and well-isolated voltammetric peaks were obtained by differential pulse voltammetry (DPV). Additionally, the proposed sensor was examined for applicability by determining 6-mercaptopurine and 6-thioguanine in real samples, and the recovery in the range of 97.5-103.0 % was obtained.

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