Electrochemical aptasensor for tetracycline using a screen-printed carbon electrode modified with an alginate film containing reduced graphene oxide and magnetite (Fe3O4) nanoparticles

2015 ◽  
Vol 183 (2) ◽  
pp. 723-729 ◽  
Author(s):  
Xuejia Zhan ◽  
Guangzhi Hu ◽  
Thomas Wagberg ◽  
Shenshan Zhan ◽  
Hanchu Xu ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Fe3o4 Nanoparticles ◽  
Carbon Electrode ◽  
Electrochemical Aptasensor ◽  
Magnetite Fe3o4 ◽  
Screen Printed Carbon Electrode ◽  
Reduced Graphene ◽  
Screen Printed

scholarly journals Tyrosinase/Chitosan/Reduced Graphene Oxide Modified Screen-Printed Carbon Electrode for Sensitive and Interference-Free Detection of Dopamine

2019 ◽  
Vol 9 (4) ◽  
pp. 622 ◽  
Author(s):  
Cheng-You Liu ◽  
Yi-Chieh Chou ◽  
Jui-Hsuan Tsai ◽  
Tzu-Ming Huang ◽  
Jian-Zhang Chen ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Electrochemical Sensors ◽  
High Sensitivity ◽  
Carbon Electrode ◽  
Screen Printed Carbon Electrode ◽  
Reduced Graphene ◽  
Sensitivity And Selectivity ◽  
Cv Measurements ◽  
Screen Printed

Tyrosinase, chitosan, and reduced graphene oxide (rGO) are sequentially used to modify a screen-printed carbon electrode (SPCE) for the detection of dopamine (DA), without interference from uric acid (UA) or ascorbic acid (AA). The use of tyrosinase significantly improves the detection’s specificity. Cyclic voltammetry (CV) measurements demonstrate the high sensitivity and selectivity of the proposed electrochemical sensors, with detection limits of 22 nM and broad linear ranges of 0.4–8 μM and 40–500 μM. The fabricated tyrosinase/chitosan/rGO/SPCE electrodes achieve satisfactory results when applied to human urine samples, thereby demonstrating their feasibility for analyzing DA in physiological samples.

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