scholarly journals Screen-Printed Carbon Electrodes Modified by Rhodium Dioxide and Glucose Dehydrogenase

2010 ◽  
Vol 2010 ◽  
pp. 1-7 ◽  
Author(s):  
Vojtěch Polan ◽  
Jan Soukup ◽  
Karel Vytřas
Keyword(s):  
Detection Limit ◽  
Response Time ◽  
Glucose Dehydrogenase ◽  
Glucose Biosensor ◽  
Carbon Electrodes ◽  
Carbon Electrode ◽  
Glucose Biosensors ◽  
Screen Printed Carbon Electrode ◽  
Enzyme Biosensor ◽  
Screen Printed

The described glucose biosensor is based on a screen-printed carbon electrode (SPCE) modified by rhodium dioxide, which functions as a mediator. The electrode is further modified by the enzyme glucose dehydrogenase, which is immobilized on the electrode's surface through electropolymerization with m-phenylenediamine. The enzyme biosensor was optimized and tested in model glucose samples. The biosensor showed a linear range of 500–5000 mg L−1 of glucose with a detection limit of 210 mg L−1 (established as 3σ) and response time of 39 s. When compared with similar glucose biosensors based on glucose oxidase, the main advantage is that neither ascorbic and uric acids nor paracetamol interfere measurements with this biosensor at selected potentials.

Nanocomposites of poly(l-methionine), carbon nanotube–graphene complexes and Au nanoparticles on screen printed carbon electrodes for electrochemical analyses of dopamine and uric acid in human urine solutions

The Analyst ◽  
2020 ◽  
Vol 145 (10) ◽  
pp. 3656-3665
Author(s):  
Yunpei Si ◽  
Yae Eun Park ◽  
Ji Eun Lee ◽  
Hye Jin Lee
Keyword(s):  
Uric Acid ◽  
Carbon Nanotube ◽  
Human Urine ◽  
Au Nanoparticles ◽  
Carbon Electrodes ◽  
Carbon Electrode ◽  
Screen Printed Carbon Electrode ◽  
Uric Acid Determination ◽  
Acid Determination ◽  
Screen Printed

A sensitive electrochemical sensor decorated with poly(l-methionine), carbon nanotube–graphene complexes and Au nanoparticles on a screen printed carbon electrode for dopamine and uric acid determination in human urine solution.

scholarly journals Modification of Screen Printed Carbon Electrode (SPCE) with Fe3O4 for the Determination of Nitrite (NO2-) in Squarewave Voltammetry

Molekul ◽  
2017 ◽  
Vol 12 (2) ◽  
pp. 139 ◽  
Author(s):  
Erica Marista Rosida ◽  
Ani Mulyasuryani ◽  
Rachmat Triandi Tjahjanto
Keyword(s):  
Cyclic Voltammetry ◽  
Detection Limit ◽  
Carbon Electrode ◽  
Food Preservatives ◽  
Peak Current ◽  
Screen Printed Carbon Electrode ◽  
The Government ◽  
Selection Of ◽  
Screen Printed

Nitrite is one of the food preservatives that the government permits, but on the use of over limits can cause endanger health, so it is necessary to control the content of nitrite in the food. Modification of electrodes on a screen printed carbon electrode (SPCE) with Fe3O4 has been successfully done for determination of nitrite. Modification of the electrode has been done by electrodeposition with cyclic voltammetry. Electrodeposition successfully performed with an electrolyte solution of FeCl3 in ethanol. Selection of the optimum drying temperature modified electrode obtained based on the respond of the solution of nitrite in Britton Robinson buffer pH 8. The result of the modification electrode used for the determination of nitrite with squarewave voltammetry method. Reaction between Fe3+ with nitrite a basis for determining nitric indirectly measured so that the peak current is the peak current of Fe3+ of about 0,55 V vs Ag/AgCl. The results showed nitrite measurements with this method has a detection limit of 1.3 x 10-8 M.

scholarly journals The Development of Diazinon Sensors using Polyvinyl Alcohol (PVA) Membrane CuO on Surface Screen-Printed Carbon Electrode (SPCE) as a Receptor

2019 ◽  
Vol 8 (2) ◽  
pp. 162-169
Author(s):  
Anisa Resti ◽  
◽  
Ani Mulyasuryani ◽  
Diah Mardiana
Keyword(s):  
Citric Acid ◽  
Polyvinyl Alcohol ◽  
Response Time ◽  
Carbon Electrode ◽  
Screen Printed Carbon Electrode ◽  
Screen Printed

The development of Diazinon sensor has been studied using polyvinyl alcohol (PVA-CuO membrane on the surface of the screen-printed carbon electrode (SPCE) as a receptor. The membrane used consisted of polyvinyl alcohol (PVA) 5% (w/v), citric acid 5% (w/v), glutaraldehyde 4% (v/v), Diazinon solution 40 ppm (v/v), and CuO 5% (w/v). This study established the effect of Diazinon at 0.01,0.02 and 0.03 (w/w). besides, the concentration of CuO was 0.5 and 1 (w/w). Signal measurements were carried out in the concentration range of the Diazinon 10-12 - 10-5 M solution in Britton-Robinson buffer at pH 2 - 5. Besides, the influence of the electrolyte type was studied using HCl pH 4, 10-5 M KCl, pH 3 phosphate and phosphate-KCl pH 3 buffers. The results of the Diazinon sensor characterization showed that the highest sensitivity was obtained at 42 mV/decade with a response time of 180 seconds.

scholarly journals Simultaneous Analysis of Paracetamol and Diclofenac Using MWCNTs-COOH Modified Screen-Printed Carbon Electrode and Pulsed Potential Accumulation

Materials ◽  
2020 ◽  
Vol 13 (14) ◽  
pp. 3091 ◽  
Author(s):  
Agnieszka Sasal ◽  
Katarzyna Tyszczuk-Rotko ◽  
Magdalena Wójciak ◽  
Ireneusz Sowa ◽  
Michał Kuryło
Keyword(s):  
Detection Limit ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Differential Pulse ◽  
Simultaneous Analysis ◽  
Carbon Electrode ◽  
Multiwalled Carbon ◽  
Screen Printed Carbon Electrode ◽  
Screen Printed

A differential-pulse adsorptive stripping voltammetric (DPAdSV) procedure with the use of pulsed potential accumulation and carboxyl functionalized multiwalled carbon nanotubes modified screen-printed carbon electrode (SPCE/MWCNTs-COOH) was delineated for simultaneous analysis of paracetamol (PA) and diclofenac (DF). The use of carboxyl functionalized MWCNTs and pulsed potential accumulation improves the analytical signals of PA and DF, and minimizes interferences from surfactants. After optimization of analytical conditions for this sensor, the peak currents of the two compounds were found to increase linearly with the increase in their concentration (5.0 × 10−9–5.0 × 10−6 mol L−1 with a detection limit of 1.4 × 10−9 mol L−1 for PA, and 1.0 × 10−10–2.0 × 10−8 mol L−1 with a detection limit of 3.0 × 10−11 mol L−1 for DF). For the first time, the electrochemical sensor allows simultaneous determination of PA and DF at concentrations of 24.3 ± 0.5 nmol L−1 and 3.7 ± 0.7 nmol L−1, respectively, in wastewater samples purified in a sewage treatment plant.

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