Differential Electroanalysis of Dopamine in the Presence of a Large Excess of Ascorbic Acid at a Nickel Oxide Nanoparticle-Modified Glassy Carbon Electrode
Joint Authors
Althagafi, Zahrah T.
Althakafy, Jalal T.
Al Jahdaly, Badriah A.
Awad, Mohamed I.
Source
Issue
Vol. 2020, Issue 2020 (31 Dec. 2020), pp.1-15, 15 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2020-08-01
Country of Publication
Egypt
No. of Pages
15
Main Subjects
Abstract EN
Electrochemical determination of dopamine (DA) in the presence of a large excess of ascorbic acid (AA) in their coexistence at a nickel oxide nanoparticle-modified preoxidized glassy carbon electrode (GCox/nano-NiOx) is achieved.
The GCox/nano-NiOx electrode is prepared by electrodeposition of nickel nanoparticles (nano-Ni) onto an electrochemically activated glassy carbon (GC) electrode, and the thus prepared nano-Ni were subjected to electrochemical oxidation in alkaline medium for the formation of nickel oxide (NiOx).
Modified electrodes were electrochemically and morphologically characterized.
The effect of loading level of nickel was investigated by changing the number of potential cycles for the deposition of nano-Ni, i.e., 1, 2, 5, and 10 potential cycles, in the potential range from 0 to -1.0 V vs.
SCE.
Also, the experimental and instrumental parameters were optimized.
Experimental results showed that the modified electrode differentiates well the oxidation peaks of DA and AA enabling the electrochemical determination of DA in the presence of a large excess of AA.
Remarkably, it is found that the oxidation current of DA is 2 times larger than that of AA even the concentration of AA is about 5 times larger than that of DA.
The LOD and LOQ of DA were calculated and were found to equal 0.69 and 2.3 mM, respectively.
This offers the advantage of simple and selective detection of DA free of the interference of AA in real samples.
American Psychological Association (APA)
Althagafi, Zahrah T.& Althakafy, Jalal T.& Al Jahdaly, Badriah A.& Awad, Mohamed I.. 2020. Differential Electroanalysis of Dopamine in the Presence of a Large Excess of Ascorbic Acid at a Nickel Oxide Nanoparticle-Modified Glassy Carbon Electrode. Journal of Sensors،Vol. 2020, no. 2020, pp.1-15.
https://search.emarefa.net/detail/BIM-1190682
Modern Language Association (MLA)
Althagafi, Zahrah T.…[et al.]. Differential Electroanalysis of Dopamine in the Presence of a Large Excess of Ascorbic Acid at a Nickel Oxide Nanoparticle-Modified Glassy Carbon Electrode. Journal of Sensors No. 2020 (2020), pp.1-15.
https://search.emarefa.net/detail/BIM-1190682
American Medical Association (AMA)
Althagafi, Zahrah T.& Althakafy, Jalal T.& Al Jahdaly, Badriah A.& Awad, Mohamed I.. Differential Electroanalysis of Dopamine in the Presence of a Large Excess of Ascorbic Acid at a Nickel Oxide Nanoparticle-Modified Glassy Carbon Electrode. Journal of Sensors. 2020. Vol. 2020, no. 2020, pp.1-15.
https://search.emarefa.net/detail/BIM-1190682
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1190682