Please use this identifier to cite or link to this item: http://cmuir.cmu.ac.th/jspui/handle/6653943832/66592
Title: Gold nanoparticles decorated on carbon nanotube modified screen-printed electrode for flow injection amperometric determination of methyldopa
Authors: Jantima Upan
Suwaphid Themsirimongkon
Surin Saipanya
Jaroon Jakmunee
Keywords: Biochemistry, Genetics and Molecular Biology
Chemistry
Materials Science
Mathematics
Physics and Astronomy
Issue Date: 1-May-2019
Abstract: © 2019, All Right reserved. Gold nanoparticles (AuNPs) decorated on multi-walled carbon nanotubes (MWCNTs) were used as a modifier on the surface of a screen-printed carbon electrode (SPCE) for sensitive determination of methyldopa, which is widely used as an antihypertensive medicine. The electrochemical oxidation of methyldopa on the modified electrode was carried out in flow injection amperometric (FI–amp) system at the applied potential of +400 mV vs Ag/AgCl. As a result, SPCE modified with 20%w/w of gold nanoparticles on carbon nanotube (AuNPs-CNT/SPCE) provided an excellent sensitivity to methyldopa detection. Morphology of AuNPs-CNT was characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive spectroscopy (EDS), and x-ray diffraction (XRD), which indicated a proper distribution of AuNPs on CNT and high electrode areas. Several parameters that affect the response of the modified electrode were studied. The plot of peak height versus methyldopa concentration showed a linear range of 0.2-100 μM with a detection limit of 0.1 μM. The proposed flow injection amperometric system was successfully applied for methyldopa determination in real samples.
URI: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85071151039&origin=inward
http://cmuir.cmu.ac.th/jspui/handle/6653943832/66592
ISSN: 01252526
Appears in Collections:CMUL: Journal Articles

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