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.

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

Functionalized-graphene modified graphite electrode for the selective determination of dopamine in presence of uric acid and ascorbic acid

2011 ◽  
Vol 81 (2) ◽  
pp. 104-108 ◽  
Author(s):  
Malledevaru Mallesha ◽  
Revanasiddappa Manjunatha ◽  
C. Nethravathi ◽  
Gurukar Shivappa Suresh ◽  
Michael Rajamathi ◽  
...  
Keyword(s):  
Ascorbic Acid ◽  
Uric Acid ◽  
Graphite Electrode ◽  
Functionalized Graphene ◽  
Selective Determination

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

scholarly journals Fabrication of Efficient and Selective Modified Graphene Paste Sensor for the Determination of Catechol and Hydroquinone

Surfaces ◽  
2020 ◽  
Vol 3 (3) ◽  
pp. 473-483
Author(s):  
Jamballi G. Manjunatha
Keyword(s):  
Modified Electrode ◽  
High Sensitivity ◽  
Differential Pulse ◽  
Official Method ◽  
Limit Of Quantification ◽  
Selective Determination ◽  
Graphene Paste Electrode ◽  
Modified Graphene ◽  
Paste Electrode

An electrochemical sensor, based on a graphene paste electrode (GPE), was modified with a polymerization method, and the electrochemical behavior of catechol (CC) and hydroquinone (HQ) was investigated using electroanalytical methods like cyclic voltammetry (CV) and differential pulse voltammetry (DPV). The effect of CC at the modified electrode was evidenced by the positive shift of the oxidation peak potential of CC at the poly (rosaniline)-modified graphene paste electrode (PRAMGPE) and the nine-fold enhancement of the peak current, as compared to a bare graphene paste electrode (BGPE). The sensitivity of CC investigated by DPV was more sensitive than CV for the analysis of CC. The DPV method showed the two linear ranges of 2.0 × 10−6–1.0 × 10−5 M and 1.5 × 10−5–5 × 10−5 M. The detection limit and limit of quantification were determined to be 8.2 × 10−7 and 27.6 × 10−7 M, respectively. The obtained results were compared successfully with respect to those obtained using the official method. Moreover, this sensor is applied for the selective determination of CC in the presence of HQ. The high sensitivity, good reproducibility, and wide linear range make the modified electrode suitable for the determination of CC in real samples. The practical application of the sensor was demonstrated by determining the concentration of CC in water samples with acceptable recoveries (97.5–98%).

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.

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