Staff View: A new electro-generated o-dianisidine derivative stabilized MWCNT-modified GCE for low potential gallic acid

A new electro-generated o-dianisidine derivative stabilized MWCNT-modified GCE for low potential gallic acid

The exploration of functional group interactions and electro-generated species stabilization on chemically modified electrodes for efficient electro-analytical application is a continuing research area in electrochemistry. In addition, the electrochemical behaviours of the intermediate species, whic...

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Main Authors:	Sundaram, Sornambikai, Jagannathan, Madhanagopal, Abdul Kadir, Mohammed Rafiq, Palanivel, Sathishkumar, Hadibarata, Tony, Mohammed Yusoff, Abdul Rahim
Format:	Article
Published:	Royal Society of Chemistry 2015
Subjects:	TD Environmental technology. Sanitary engineering
Online Access:	http://eprints.utm.my/id/eprint/55720/ http://dx.doi.org/10.1039/c5ra06304c
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spelling	my.utm.557202017-02-15T01:46:41Z http://eprints.utm.my/id/eprint/55720/ A new electro-generated o-dianisidine derivative stabilized MWCNT-modified GCE for low potential gallic acid Sundaram, Sornambikai Jagannathan, Madhanagopal Abdul Kadir, Mohammed Rafiq Palanivel, Sathishkumar Hadibarata, Tony Mohammed Yusoff, Abdul Rahim TD Environmental technology. Sanitary engineering The exploration of functional group interactions and electro-generated species stabilization on chemically modified electrodes for efficient electro-analytical application is a continuing research area in electrochemistry. In addition, the electrochemical behaviours of the intermediate species, which are generated from the aromatic organic redox mediator and possess both methoxy and amine functional groups, have been rarely studied for electro-analytical applications. For the first time, we report the stabilization of an electro-generated enone derivative of the o-dianisidine (EDo-D) dimer formed as one of the intermediate species during o-dianisidine immobilization. The electro-generated o-dianisidine derivative (o-DD)-stabilized multi-walled carbon nanotube (MWCNT)-modified glassy carbon electrode (GCE/o-DD@MWCNT) exhibited two highly reproducible and, well-defined surface-confined redox couples in a pH 7 phosphate buffer solution (PBS). FTIR analyses indicated the presence of an amine group linkage and an azo product in the o-DD@MWCNT hybrid. UV-Vis and GC-MS analyses confirmed the presence of o-dianisidine in its azo dimer form within the MWCNT. In addition, the enone derivative of the o-dianisidine dimer present on the GCE/o-DD@MWCNT successfully sensed gallic acid (GA) at 0.16 V vs. Ag/AgCl in pH 7 PBS. Highly selective GA detection was achieved with a sensitivity of 0.4580 µA µM-1, a detection range of 100-1300 µM and a detection limit of 144 nM using chronoamperometry. GCE/o-DD@MWCNT also demonstrated effective GA detection in simulated real grape juice and water samples. Royal Society of Chemistry 2015 Article PeerReviewed Sundaram, Sornambikai and Jagannathan, Madhanagopal and Abdul Kadir, Mohammed Rafiq and Palanivel, Sathishkumar and Hadibarata, Tony and Mohammed Yusoff, Abdul Rahim (2015) A new electro-generated o-dianisidine derivative stabilized MWCNT-modified GCE for low potential gallic acid. RSC Advances, 5 (57). pp. 45996-46006. ISSN 2046-2069 http://dx.doi.org/10.1039/c5ra06304c DOI:10.1039/c5ra06304c
institution	Universiti Teknologi Malaysia
building	UTM Library
collection	Institutional Repository
continent	Asia
country	Malaysia
content_provider	Universiti Teknologi Malaysia
content_source	UTM Institutional Repository
url_provider	http://eprints.utm.my/
topic	TD Environmental technology. Sanitary engineering
spellingShingle	TD Environmental technology. Sanitary engineering Sundaram, Sornambikai Jagannathan, Madhanagopal Abdul Kadir, Mohammed Rafiq Palanivel, Sathishkumar Hadibarata, Tony Mohammed Yusoff, Abdul Rahim A new electro-generated o-dianisidine derivative stabilized MWCNT-modified GCE for low potential gallic acid
description	The exploration of functional group interactions and electro-generated species stabilization on chemically modified electrodes for efficient electro-analytical application is a continuing research area in electrochemistry. In addition, the electrochemical behaviours of the intermediate species, which are generated from the aromatic organic redox mediator and possess both methoxy and amine functional groups, have been rarely studied for electro-analytical applications. For the first time, we report the stabilization of an electro-generated enone derivative of the o-dianisidine (EDo-D) dimer formed as one of the intermediate species during o-dianisidine immobilization. The electro-generated o-dianisidine derivative (o-DD)-stabilized multi-walled carbon nanotube (MWCNT)-modified glassy carbon electrode (GCE/o-DD@MWCNT) exhibited two highly reproducible and, well-defined surface-confined redox couples in a pH 7 phosphate buffer solution (PBS). FTIR analyses indicated the presence of an amine group linkage and an azo product in the o-DD@MWCNT hybrid. UV-Vis and GC-MS analyses confirmed the presence of o-dianisidine in its azo dimer form within the MWCNT. In addition, the enone derivative of the o-dianisidine dimer present on the GCE/o-DD@MWCNT successfully sensed gallic acid (GA) at 0.16 V vs. Ag/AgCl in pH 7 PBS. Highly selective GA detection was achieved with a sensitivity of 0.4580 µA µM-1, a detection range of 100-1300 µM and a detection limit of 144 nM using chronoamperometry. GCE/o-DD@MWCNT also demonstrated effective GA detection in simulated real grape juice and water samples.
format	Article
author	Sundaram, Sornambikai Jagannathan, Madhanagopal Abdul Kadir, Mohammed Rafiq Palanivel, Sathishkumar Hadibarata, Tony Mohammed Yusoff, Abdul Rahim
author_facet	Sundaram, Sornambikai Jagannathan, Madhanagopal Abdul Kadir, Mohammed Rafiq Palanivel, Sathishkumar Hadibarata, Tony Mohammed Yusoff, Abdul Rahim
author_sort	Sundaram, Sornambikai
title	A new electro-generated o-dianisidine derivative stabilized MWCNT-modified GCE for low potential gallic acid
title_short	A new electro-generated o-dianisidine derivative stabilized MWCNT-modified GCE for low potential gallic acid
title_full	A new electro-generated o-dianisidine derivative stabilized MWCNT-modified GCE for low potential gallic acid
title_fullStr	A new electro-generated o-dianisidine derivative stabilized MWCNT-modified GCE for low potential gallic acid
title_full_unstemmed	A new electro-generated o-dianisidine derivative stabilized MWCNT-modified GCE for low potential gallic acid
title_sort	new electro-generated o-dianisidine derivative stabilized mwcnt-modified gce for low potential gallic acid
publisher	Royal Society of Chemistry
publishDate	2015
url	http://eprints.utm.my/id/eprint/55720/ http://dx.doi.org/10.1039/c5ra06304c
_version_	1643653881279807488
score	13.211869

A new electro-generated o-dianisidine derivative stabilized MWCNT-modified GCE for low potential gallic acid

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