scholarly journals Cobalt and Nickel Nanoparticles Binary Catalyst Modified Glassy Carbon Electrode for Glucose and Ascorbic Acid Electrooxidation in Alkaline Medium

2021 ◽  
pp. 150486
Author(s):  
Mohamed I. Awad ◽  
Keyword(s):  
Ascorbic Acid ◽  
Glassy Carbon Electrode ◽  
Alkaline Medium ◽  
Glassy Carbon ◽  
Nickel Nanoparticles ◽  
Carbon Electrode ◽  
Modified Glassy Carbon Electrode ◽  
Binary Catalyst ◽  
Cobalt And Nickel

scholarly journals Electrochemical antioxidant screening and evaluation based on guanine and chitosan immobilized MoS2 nanosheet modified glassy carbon electrode (guanine/CS/MoS2/GCE)

2020 ◽  
Vol 18 (1) ◽  
pp. 1-9 ◽  
Author(s):  
Ping Tang ◽  
Xiaosheng Tang ◽  
Shiyong Mei ◽  
Yixi Xie ◽  
Liangliang Liu ◽  
...  
Keyword(s):  
Ascorbic Acid ◽  
Antioxidant Capacity ◽  
Glassy Carbon Electrode ◽  
Glassy Carbon ◽  
Carbon Electrode ◽  
Oxidation Peak ◽  
Modified Glassy Carbon Electrode ◽  
Peak Current ◽  
Oxidation Peak Current ◽  
Antioxidant Capacities

AbstractIn this study, an electrochemical biosensor based on guanine and chitosan immobilized MoS2 nanosheet modified glassy carbon electrode (guanine/CS/MoS2/GCE) was developed and employed for antioxidant screening and antioxidant capacity evaluation. The oxidation peak current of guanine was improved and nearly tripled after modifications of chitosan and MoS2 nanosheet. The immobilized guanine could be damaged by hydroxyl radicals generated in Fenton solution. However, in the presence of antioxidants, the guanine was protected and the oxidation peak current of guanine increased. This process mimics the mechanism of antioxidant protection in human body. The factors affecting preparation of sensor and detection of antioxidant capacity were optimized. At the optimum conditions, the guanine/CS/MoS2/GCE showed wide linear range, low detection limit, satisfactory reproducibility and stability for detection. Ascorbic acid was used as a model antioxidant to evaluate the antioxidant capacity. A good linearity was observed with a correlation coefficient of 0.9959 in the concentrations between 0.5 and 4.0 mg L-1. The antioxidant capacities of three flavonoids were also tested and the rank of antioxidant capacities was ascorbic acid (51.84%), quercetin (45.82%), fisetin (34.39%) and catechin (16.99%). Due to the rapid measurement and low cost, this sensor could provide an available sensing platform for antioxidant screening and evaluation.

Simultaneous determination of dopamine and ascorbic acid on poly (3,4-ethylenedioxythiophene) modified glassy carbon electrode

2005 ◽  
Vol 10 (11) ◽  
pp. 905-913 ◽  
Author(s):  
S. Senthil Kumar ◽  
J. Mathiyarasu ◽  
K. L. N. Phani ◽  
V. Yegnaraman
Keyword(s):  
Ascorbic Acid ◽  
Simultaneous Determination ◽  
Glassy Carbon Electrode ◽  
Glassy Carbon ◽  
Carbon Electrode ◽  
Modified Glassy Carbon Electrode

scholarly journals Simultaneous Electrochemical Detection of Dopamine and Ascorbic Acid Using an Iron Oxide/Reduced Graphene Oxide Modified Glassy Carbon Electrode

Sensors ◽  
2014 ◽  
Vol 14 (8) ◽  
pp. 15227-15243 ◽  
Author(s):  
Teo Peik-See ◽  
Alagarsamy Pandikumar ◽  
Huang Nay-Ming ◽  
Lim Hong-Ngee ◽  
Yusran Sulaiman
Keyword(s):  
Ascorbic Acid ◽  
Graphene Oxide ◽  
Iron Oxide ◽  
Reduced Graphene Oxide ◽  
Glassy Carbon Electrode ◽  
Electrochemical Detection ◽  
Glassy Carbon ◽  
Carbon Electrode ◽  
Modified Glassy Carbon Electrode ◽  
Reduced Graphene
Sign in / Sign up

Export Citation Format

Share Document