A screen printed carbon electrode modified with a lamellar nanocomposite containing dendritic silver nanostructures, reduced graphene oxide, and β-cyclodextrin for voltammetric sensing of nitrite

2019 ◽  
Vol 186 (5) ◽  
Author(s):  
Taotao Zhe ◽  
Xinyu Sun ◽  
Qinzhi Wang ◽  
Yingnan Liu ◽  
Rui Li ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Silver Nanostructures ◽  
Carbon Electrode ◽  
Screen Printed Carbon Electrode ◽  
Reduced Graphene ◽  
Voltammetric Sensing ◽  
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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