scholarly journals Hydrogen peroxide biosensor based on hemoglobin-modified gold nanoparticles–screen printed carbon electrode

2020 ◽  
Vol 28 ◽  
pp. 100340 ◽  
Author(s):  
Ali Saad Elewi ◽  
Shatha Abdul Wadood Al-Shammaree ◽  
Abdul Kareem M.A. AL Sammarraie
Keyword(s):  
Hydrogen Peroxide ◽  
Gold Nanoparticles ◽  
Carbon Electrode ◽  
Hydrogen Peroxide Biosensor ◽  
Screen Printed Carbon Electrode ◽  
Screen Printed

scholarly journals Development of Hydrogen Peroxide Biosensor Based on Immobilization of Hemoglobin on Screen-Printed Carbon Electrode Modified With Silver Nanoparticles

2019 ◽  
pp. 2332-2340
Author(s):  
Ali Saad Elewi ◽  
Shatha Abdul Wadood ◽  
Abdul Kareem Mohammed Ali
Keyword(s):  
Hydrogen Peroxide ◽  
Silver Nanoparticles ◽  
Electron Transfer ◽  
Direct Electron Transfer ◽  
Phosphate Buffer Solution ◽  
Carbon Electrode ◽  
Buffer Solution ◽  
Hydrogen Peroxide Biosensor ◽  
Screen Printed Carbon Electrode ◽  
Screen Printed

     The direct electron transfer behavior of hemoglobin that is immobilized onto screen-printed carbon electrode (SPCE) modified with silver nanoparticles (AgNPs) and chitosan (CS) was studied in this work. Cyclic voltametry and spectrophotometry were used to characterize the hemoglobin (Hb) bioconjunction with AgNPs and CS. Results of the modified electrode showed quasi-reversible redox peaks with a formal potential of (-0.245V) versus Ag/AgCl in 0.1M phosphate buffer solution (PBS), pH7, at a scan rate of 0.1Vs-1. The charge transfer coefficient (α) was 0.48 and the apparent electron transfer rate constant (Ks) was 0.47s-1. The electrode was used as a hydrogen peroxide biosensor with a linear response over 3 to 240 µM and a detection limit of 0.6 µM. As a result, the modified biosensor here has exhibited a high sensitivity, good reproducibility and stability.

A microfluidic device based on a screen-printed carbon electrode with electrodeposited gold nanoparticles for the detection of IgG anti-Trypanosoma cruzi antibodies

The Analyst ◽  
2011 ◽  
Vol 136 (22) ◽  
pp. 4745 ◽  
Author(s):  
Sirley V. Pereira ◽  
Franco A. Bertolino ◽  
Martín A. Fernández-Baldo ◽  
Germán A. Messina ◽  
Eloy Salinas ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Trypanosoma Cruzi ◽  
Microfluidic Device ◽  
Carbon Electrode ◽  
Screen Printed Carbon Electrode ◽  
Electrodeposited Gold Nanoparticles ◽  
Screen Printed
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