scholarly journals Formation and Electrochemical Evaluation of Polyaniline and Polypyrrole Nanocomposites Based on Glucose Oxidase and Gold Nanostructures

Polymers ◽  
2020 ◽  
Vol 12 (12) ◽  
pp. 3026 ◽  
Author(s):  
Natalija German ◽  
Almira Ramanaviciene ◽  
Arunas Ramanavicius
Keyword(s):  
Electron Transfer ◽  
Glucose Oxidase ◽  
Limit Of Detection ◽  
Gold Nanoclusters ◽  
Analytical Signal ◽  
Glucose Biosensor ◽  
Logarithmic Function ◽  
Anodic Current ◽  
Diffusion Controlled ◽  
Scan Rate

Nanocomposites based on two conducting polymers, polyaniline (PANI) and polypyrrole (Ppy), with embedded glucose oxidase (GOx) and 6 nm size gold nanoparticles (AuNPs(6nm)) or gold-nanoclusters formed from chloroaurate ions (AuCl4−), were synthesized by enzyme-assisted polymerization. Charge (electron) transfer in systems based on PANI/AuNPs(6nm)-GOx, PANI/AuNPs(AuCl4−)-GOx, Ppy/AuNPs(6nm)-GOx and Ppy/AuNPs(AuCl4−)-GOx nanocomposites was investigated. Cyclic voltammetry (CV)-based investigations showed that the reported polymer nanocomposites are able to facilitate electron transfer from enzyme to the graphite rod (GR) electrode. Significantly higher anodic current and well-defined red-ox peaks were observed at a scan rate of 0.10 V s−1. Logarithmic function of anodic current (log Ipa), which was determined by CV-based experiments performed with glucose, was proportional to the logarithmic function of a scan rate (log v) in the range of 0.699–2.48 mV s−1, and it indicates that diffusion-controlled electrochemical processes were limiting the kinetics of the analytical signal. The most efficient nanocomposite structure for the design of the reported glucose biosensor was based on two-day formed Ppy/AuNPs(AuCl4−)-GOx nanocomposites. GR/Ppy/AuNPs(AuCl4−)-GOx was characterized by the linear dependence of the analytical signal on glucose concentration in the range from 0.1 to 0.70 mmol L−1, the sensitivity of 4.31 mA mM cm−2, the limit of detection of 0.10 mmol L−1 and the half-life period of 19 days.

Synthesis of gold nanoparticles supported on functionalized nanosilica using deep eutectic solvent for an electrochemical enzymatic glucose biosensor

2017 ◽  
Vol 5 (34) ◽  
pp. 7072-7081 ◽  
Author(s):  
Siva Kumar-Krishnan ◽  
M. Guadalupe-Ferreira García ◽  
E. Prokhorov ◽  
M. Estevez-González ◽  
Ramiro Pérez ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Electron Transfer ◽  
Glucose Oxidase ◽  
Direct Electron Transfer ◽  
Deep Eutectic Solvent ◽  
Glucose Biosensor ◽  
Enzymatic Biosensor

Synthesis of AuNPs supported on nanosilica, mediated by deep eutectic solvent (DES), for efficient immobilization of glucose oxidase (GOx) and enhanced direct electron transfer in an enzymatic biosensor.

Comportement photoélectrochimique de ZnIn2S4(n) dans l'obscurité et sous éclairement en solution électrolytique aqueuse

1992 ◽  
Vol 70 (4) ◽  
pp. 1098-1104 ◽  
Author(s):  
O. Savadogo
Keyword(s):  
Electron Transfer ◽  
Redox Potential ◽  
Current Density ◽  
Flat Band ◽  
Tunnel Effect ◽  
Anodic Current Density ◽  
Flat Band Potential ◽  
Anodic Current ◽  
Species Concentration ◽  
Diffusion Controlled

Photoelectrochemical characteristics of ZnIn2S4(n) have been studied by potentiodynamic methods and capacity measurements. The variation of the anodic current density (ia) as a function of [OH−] and [H3O+] has been studied under darkness. This darkness current is small (~1 μA cm−2) and it has been attributed to the anodic dissolution of the material. This process is not diffusion controlled. This behaviour was attributed to electron transfer by tunnel effect via localized interface states. The dissolution of the material under illumination has been determined. Its dissolution requires eight holes. The variation of the stabilisation coefficient S (iox/it) with the redox potential (Vredox) and the S2− species concentration (Cr) has been studied. The effects of [S2−] and illumination on the flat band potential of the electrode have been determined.

A Glucose Biosensor Based on Direct Electron Transfer of Glucose Oxidase on PEDOT Modified Microelectrode

2020 ◽  
Vol 167 (6) ◽  
pp. 067502 ◽  
Author(s):  
Junhao Chen ◽  
Xiaoyuan Zheng ◽  
Yulin Li ◽  
Haitao Zheng ◽  
Yanjun Liu ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Glucose Oxidase ◽  
Direct Electron Transfer ◽  
Glucose Biosensor

scholarly journals Glucose Biosensor Based on Dendritic Gold Nanostructures Electrodeposited on Graphite Electrode by Different Electrochemical Methods

Chemosensors ◽  
2021 ◽  
Vol 9 (8) ◽  
pp. 188
Author(s):  
Almira Ramanaviciene ◽  
Natalija German ◽  
Asta Kausaite-Minkstimiene ◽  
Arunas Ramanavicius
Keyword(s):  
Glucose Oxidase ◽  
Limit Of Detection ◽  
Differential Pulse ◽  
Glucose Biosensor ◽  
Electrochemical Methods ◽  
Gold Nanostructures ◽  
Glucose Determination ◽  
One Step ◽  
Constant Potential ◽  
Good Repeatability

In this research, we have demonstrated a one-step electrochemical deposition of dendritic gold nanostructures (DGNs) on a graphite rod (GR) electrode without any template, seeds, surfactants, or stabilizers. Three electrochemical methods, namely, constant potential amperometry (CPA), pulse amperometry, and differential pulse voltammetry, were used for DGN synthesis on GR electrode and further application in enzymatic glucose biosensors. Formed gold nanostructures, including DGNs, were characterized by a field emission scanning electron microscopy. The optimal concentration of HAuCl4 (6.0 mmol L−1), duration of DGNs synthesis (400 s), electrodeposition potential (−0.4 V), and the best electrochemical method (CPA) were determined experimentally. Then the enzyme, glucose oxidase, was adsorbed on the surface of DGNs and covalently cross-linked with glutaraldehyde vapor. The enzymatic glucose biosensor based on DGNs electrodeposited at optimal conditions and modified with glucose oxidase showed a quick response (less than 3 s), a high saturation current (291 μA), appropriate linear range (up to 9.97 mmol L−1 of glucose, R2 = 0.9994), good repeatability (RSD 2.4, 2.2 and 1.5% for 2, 30, 97 mmol L−1 of glucose), low limit of detection (0.059 mmol L−1, S/N = 3) and good stability. Additionally, this biosensor could be successfully applied for glucose determination in real samples with good accuracy. These results proved the principle of enzymatic glucose biosensor development based on DGNs as the basis for further investigations.

Engineering graphene/carbon nanotube hybrid for direct electron transfer of glucose oxidase and glucose biosensor

2012 ◽  
Vol 42 (10) ◽  
pp. 875-881 ◽  
Author(s):  
Jianli Chen ◽  
Xianliang Zheng ◽  
Fujun Miao ◽  
Jienan Zhang ◽  
Xiaoqiang Cui ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Carbon Nanotube ◽  
Glucose Oxidase ◽  
Direct Electron Transfer ◽  
Glucose Biosensor

scholarly journals A Reliable Cyclic Voltammetry Technique for the Degradation of Salicylaldehyde: Electrode Kinetics

2021 ◽  
Vol 20 (5) ◽  
Author(s):  
Jasvinder Kaur ◽  
Rajdeep Malik ◽  
Dushyant Gangwar
Keyword(s):  
Electron Transfer ◽  
Cyclic Voltammetry ◽  
Rate Constant ◽  
Limit Of Detection ◽  
Industrial Applications ◽  
Electron Transfer Rate ◽  
Limit Of Quantification ◽  
Diffusion Controlled ◽  
Electron Transfer Rate Constant ◽  
Electrochemical Parameters

Salicylaldehyde (SA) is used in numerous biological, pharmaceutical, and industrial applications. Releasing effluents from these industries contaminates water. So the degradation of salicylaldehyde is necessitated. The electrochemical degradation of salicylaldehyde in buffered media was studied using the eco-friendly cyclic voltammetry (CV) technique on a platinum electrode at different scan rates. Kinetic and electrochemical parameters were evaluated for the reaction such as standard heterogeneous rate constant (k0,2.468×103 s-1 ), anodic electron transfer rate constant (kox,2.507×103 s-1), electron transfer coefficient of reaction (?,0.673), and formal potential (E0, 1.0937) under the influence of scan rate. The nature of the reaction is found to be diffusion controlled. The concentration study in the range of 1 mM to 4 mM was calibrated. The limit of detection and the limit of quantification were calculated to be 0.0031 mM and 0.0103 mM respectively.

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