Gold Nanoparticles Decorated on Carbon Nanotube Modified Screen-printed Electrode for Flow Injection Amperometric Determination of Methyldopa

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 methyldo...

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Main Authors: Jantima Upan, Suwaphid Themsirimongkon, Surin Saipanya, Jaroon Jakmunee
Language:English
Published: Science Faculty of Chiang Mai University 2019
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Online Access:http://it.science.cmu.ac.th/ejournal/dl.php?journal_id=10143
http://cmuir.cmu.ac.th/jspui/handle/6653943832/66032
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Institution: Chiang Mai University
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spelling th-cmuir.6653943832-660322019-08-21T09:18:20Z Gold Nanoparticles Decorated on Carbon Nanotube Modified Screen-printed Electrode for Flow Injection Amperometric Determination of Methyldopa Jantima Upan Suwaphid Themsirimongkon Surin Saipanya Jaroon Jakmunee carbon nanotubes flow injection analysis gold nanoparticle methyldopa screen printed electrode 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), and energy dispersive spectroscopy (EDS), 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. 2019-08-21T09:18:20Z 2019-08-21T09:18:20Z 2019 Chiang Mai Journal of Science 46, 3 (May 2019), 537 - 546 0125-2526 http://it.science.cmu.ac.th/ejournal/dl.php?journal_id=10143 http://cmuir.cmu.ac.th/jspui/handle/6653943832/66032 Eng Science Faculty of Chiang Mai University
institution Chiang Mai University
building Chiang Mai University Library
country Thailand
collection CMU Intellectual Repository
language English
topic carbon nanotubes
flow injection analysis
gold nanoparticle
methyldopa
screen printed electrode
spellingShingle carbon nanotubes
flow injection analysis
gold nanoparticle
methyldopa
screen printed electrode
Jantima Upan
Suwaphid Themsirimongkon
Surin Saipanya
Jaroon Jakmunee
Gold Nanoparticles Decorated on Carbon Nanotube Modified Screen-printed Electrode for Flow Injection Amperometric Determination of Methyldopa
description 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), and energy dispersive spectroscopy (EDS), 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.
author Jantima Upan
Suwaphid Themsirimongkon
Surin Saipanya
Jaroon Jakmunee
author_facet Jantima Upan
Suwaphid Themsirimongkon
Surin Saipanya
Jaroon Jakmunee
author_sort Jantima Upan
title Gold Nanoparticles Decorated on Carbon Nanotube Modified Screen-printed Electrode for Flow Injection Amperometric Determination of Methyldopa
title_short Gold Nanoparticles Decorated on Carbon Nanotube Modified Screen-printed Electrode for Flow Injection Amperometric Determination of Methyldopa
title_full Gold Nanoparticles Decorated on Carbon Nanotube Modified Screen-printed Electrode for Flow Injection Amperometric Determination of Methyldopa
title_fullStr Gold Nanoparticles Decorated on Carbon Nanotube Modified Screen-printed Electrode for Flow Injection Amperometric Determination of Methyldopa
title_full_unstemmed Gold Nanoparticles Decorated on Carbon Nanotube Modified Screen-printed Electrode for Flow Injection Amperometric Determination of Methyldopa
title_sort gold nanoparticles decorated on carbon nanotube modified screen-printed electrode for flow injection amperometric determination of methyldopa
publisher Science Faculty of Chiang Mai University
publishDate 2019
url http://it.science.cmu.ac.th/ejournal/dl.php?journal_id=10143
http://cmuir.cmu.ac.th/jspui/handle/6653943832/66032
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