Selective determination of dopamine in the presence of ascorbic acid at the carbon atom wire modified electrode

2005 ◽  
Vol 578 (2) ◽  
pp. 323-329 ◽  
Author(s):  
Kuan-Hong Xue ◽  
Fei-Fei Tao ◽  
Wen Xu ◽  
Shou-Yin Yin ◽  
Jia-Mei Liu
Keyword(s):  
Ascorbic Acid ◽  
Carbon Atom ◽  
Modified Electrode ◽  
Selective Determination

scholarly journals Selective Determination of Dopamine in Presence of Ascorbic Acid Using Nafion Coated Methylene Blue Functionalized Graphite Electrode

2019 ◽  
Vol 31 (10) ◽  
pp. 2185-2190
Author(s):  
G. Sivasankari ◽  
K. Sivasankari ◽  
T. Nalini ◽  
P. Padmapriya ◽  
M. Nadhiya
Keyword(s):  
Methylene Blue ◽  
Ascorbic Acid ◽  
Modified Electrode ◽  
Electrode Surface ◽  
Graphite Electrode ◽  
Low Cost ◽  
Differential Pulse ◽  
Selective Determination ◽  
The Stability

An electrochemical sensor has been developed using methylene blue (MB) unctionalized graphite for the selective determination of dopamine in the presence of ascorbic acid. The immobilization of methylene blue on graphite was done by carbodiimide coupling method. The methylene blue functionalized graphite was characterized by SEM, FTIR spectroscopy and UV-visible spectroscopy. The immobilization of methylene blue functionalized graphite (MB-G) on the electrode surface was made by drop casting a small volume of MB-G dispersed methanol solution on the electrode surface. About 5 L of 0.5 % Nafion solution was also dropcasted for the stability and selectivity. The MB-G modified electrode was characterized by cyclic voltammetry. The modified electrode promotes the electrocatalytic oxidation of dopamine at a lower potential of 160 mV. The selective determination of dopamine in the presence of 100 times higher concentration of ascorbic acid was achieved by differential pulse voltammetry. The modified electrode offered a simple, selective and sensitive determination of low levels of dopamine. Also the oxidation over potential was reduced to an extent of 360 mV comparing with the bare graphite electrode. The proposed sensor has the advantage of easy fabrication, low cost, good sensitivity, reproducibility and stability.

A novel nanoporous gold modified electrode for the selective determination of dopamine in the presence of ascorbic acid

2009 ◽  
Vol 69 (1) ◽  
pp. 105-108 ◽  
Author(s):  
Hua-Jun Qiu ◽  
Gui-Ping Zhou ◽  
Guang-Lei Ji ◽  
Yun Zhang ◽  
Xi-Rong Huang ◽  
...  
Keyword(s):  
Ascorbic Acid ◽  
Modified Electrode ◽  
Nanoporous Gold ◽  
Selective Determination

Using AuCo alloy nanoparticles/HS-graphene modified electrode for the selective determination of dopamine, ascorbic acid and uric acid

2014 ◽  
Vol 6 (22) ◽  
pp. 9059-9065 ◽  
Author(s):  
Zhe Liu ◽  
Xueliang Wang ◽  
Li Sun ◽  
Zhangyu Yu
Keyword(s):  
Ascorbic Acid ◽  
Uric Acid ◽  
Modified Electrode ◽  
Electrochemical Method ◽  
Alloy Nanoparticles ◽  
Selective Determination ◽  
Set Up

An electrochemical method for the selective determination of dopamine (DA), ascorbic acid (AA) and uric acid (UA) was set up using an AuCo alloy nanoparticle/HS-graphene modified electrode.

scholarly journals A highly sensitive biosensor based on methacrylated graphene oxide-grafted polyaniline for ascorbic acid determination

2020 ◽  
Vol 9 (1) ◽  
pp. 760-767 ◽  
Author(s):  
Seyed Morteza Naghib ◽  
Farahnaz Behzad ◽  
Mehdi Rahmanian ◽  
Yasser Zare ◽  
Kyong Yop Rhee
Keyword(s):  
Ascorbic Acid ◽  
Graphene Oxide ◽  
Current Response ◽  
Functionalized Graphene ◽  
Serum Samples ◽  
Promising Candidate ◽  
Graphene Nanocomposites ◽  
Selective Determination ◽  
Highly Sensitive

AbstractFunctionalized graphene-based nanocomposites have opened new windows to address some challenges for increasing the sensitivity, accuracy and functionality of biosensors. Polyaniline (PANI) is one of the most potentially promising and technologically important conducting polymers, which brings together the electrical features of metals with intriguing properties of plastics including facile processing and controllable chemical and physical properties. PANI/graphene nanocomposites have attracted intense interest in various fields due to unique physicochemical properties including high conductivity, facile preparation and intriguing redox behavior. In this article, a functionalized graphene-grafted nanostructured PANI nanocomposite was applied for determining the ascorbic acid (AA) level. A significant current response was observed after treating the electrode surface with methacrylated graphene oxide (MeGO)/PANI nanocomposite. The amperometric responses showed a robust linear range of 8–5,000 µM and detection limit of 2 µM (N = 5). Excellent sensor selectivity was demonstrated in the presence of electroactive components interfering species, commonly found in real serum samples. This sensor is a promising candidate for rapid and selective determination of AA.

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