Simultaneous electrochemical determination of dopamine and 5-hydroxyindoleacetic acid in urine using a screen-printed graphite electrode modified with gold nanoparticles

2016 ◽  
Author(s):  
Prosper Kanyong ◽  
Sean Rawlinson ◽  
James Davis
Keyword(s):  
Gold Nanoparticles ◽  
Graphite Electrode ◽  
Electrochemical Determination ◽  
Hydroxyindoleacetic Acid ◽  
Screen Printed

scholarly journals Electrochemical Determination of Chlorogenic Acid in Nutraceuticals Using Voltammetric Sensors Based on Screen-Printed Carbon Electrode Modified with Graphene and Gold Nanoparticles

2021 ◽  
Vol 22 (16) ◽  
pp. 8897
Author(s):  
Irina-Georgiana Munteanu ◽  
Constantin Apetrei
Keyword(s):  
Gold Nanoparticles ◽  
Cyclic Voltammetry ◽  
Chlorogenic Acid ◽  
Electrochemical Determination ◽  
Point Of View ◽  
Spectrometric Method ◽  
Statistical Point ◽  
Voltammetric Sensors ◽  
Screen Printed

The present study describes the electrochemical properties of three screen-printed electrodes (SPEs), the first electrode being carbon-based (C), the second graphene-based (GPH), and the third based on GPH modified with gold nanoparticles (GNP). These electrodes were used for the study of the electrochemical behavior of chlorogenic acid in different aqueous solutions, at pH = 7. In chlorogenic acid solution, a redox process was noticed in the case of all three electrodes; GPH and GNP significantly improved the sensor response regarding sensitivity and reversibility, a fact demonstrated by characterizing the sensor by cyclic voltammetry in potassium ferrocyanide, which corresponds to the exchange of two electrons and two protons. Moreover, the calibration curves for each sensor were developed, subsequently calculating the detection limits (LOD) and the quantification limits (LOQ). Low LOD and LOQ were obtained, the best—of the order of 10−7 M (LOD = 0.62 × 10−7 M; LOQ = 1.97 × 10−7 M)—being obtained in the case of GPH-GNP-SPE, which demonstrates that the method may be applied for determining chlorogenic acid in real samples. Thus, the sensors were successfully used for the quantitative determination of chlorogenic acid in three nutraceutical products. The validation of the results was done using the FTIR method. The results obtained by cyclic voltammetry were in accordance with those obtained by the spectrometric method, without significant differences from a statistical point of view.

scholarly journals Disposable screen printed graphite electrode for the direct electrochemical determination of ibuprofen in surface water

2014 ◽  
Vol 1-2 ◽  
pp. 8-13 ◽  
Author(s):  
Sidra Amin ◽  
M. Tahir Soomro ◽  
Najma Memon ◽  
Amber R. Solangi ◽  
Sirajuddin ◽  
...  
Keyword(s):  
Surface Water ◽  
Graphite Electrode ◽  
Electrochemical Determination ◽  
Screen Printed

scholarly journals Screen-printed electrodes modified with green-synthesized gold nanoparticles for the electrochemical determination of aminothiols

2019 ◽  
Vol 847 ◽  
pp. 113184 ◽  
Author(s):  
Valeree Ross R. Bernardo-Boongaling ◽  
Núria Serrano ◽  
Juan José García-Guzmán ◽  
José María Palacios-Santander ◽  
José Manuel Díaz-Cruz
Keyword(s):  
Gold Nanoparticles ◽  
Electrochemical Determination ◽  
Screen Printed Electrodes ◽  
Screen Printed

Electrochemical determination of arsenic in natural waters using carbon fiber ultra-microelectrodes modified with gold nanoparticles

Talanta ◽  
2017 ◽  
Vol 166 ◽  
pp. 198-206 ◽  
Author(s):  
Patricio Carrera ◽  
Patricio J. Espinoza-Montero ◽  
Lenys Fernández ◽  
Hugo Romero ◽  
José Alvarado
Keyword(s):  
Gold Nanoparticles ◽  
Carbon Fiber ◽  
Natural Waters ◽  
Electrochemical Determination
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