A novel amperometric gallic acid sensor based on polymelamine entrapped graphene composite

Tse Wei Chen; Selvakumar Palanisamy; Shen Ming Chen; Vijayalakshmi Velusamy; Sayee Kannan Ramaraj

doi:10.20964/2017.05.03

A novel amperometric gallic acid sensor based on polymelamine entrapped graphene composite

Tse Wei Chen, Selvakumar Palanisamy, Shen Ming Chen, Vijayalakshmi Velusamy, Sayee Kannan Ramaraj

Research output: Contribution to journal › Article › peer-review

7 Scopus citations

Abstract

The present work describes an amperometric determination of gallic acid (GA) using a glassy carbon electrode (GCE) modified with graphene (GR) and polymelamine (PM) composite. The GR/PM composite modified electrode was prepared by electropolymerization of melamine on GR modified GCE. The as-prepared GR/PM composite was characterized by scanning electron microscopy, elemental mapping and Fourier transform infrared spectroscopy. The GR/PM composite modified GCE was used as electrocatalyst for oxidation of GA, and the composite modified electrode shows an enhanced catalytic activity than electrodes modified with GR and PM. Under optimum conditions, amperometric i-t was used to determine the GA, and the amperometric response of GA was linear over the concentration ranging from 0.1 to 728.9 μM. The limit of detection and sensitivity of the sensor was estimated as 0.027 μM and 0.697 μAμM^-1 cm^-2, respectively. The GR/PM composite modified electrode exhibits high selectivity in the presence of range of potentially interfering polyphenol compounds, dopamine, uric acid and ascorbic acid. As a proof of concept, the practicality of the sensors was examined in green tea samples, and shows acceptable practicality for the determination of GA.

Original language	British English
Pages (from-to)	4107-4119
Number of pages	13
Journal	International Journal of Electrochemical Science
Volume	12
Issue number	5
DOIs	https://doi.org/10.20964/2017.05.03
State	Published - 1 May 2017

Keywords

Amperometry
Electro-oxidation
Gallic acid
Graphene
Poly(melamine)

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title = "A novel amperometric gallic acid sensor based on polymelamine entrapped graphene composite",

abstract = "The present work describes an amperometric determination of gallic acid (GA) using a glassy carbon electrode (GCE) modified with graphene (GR) and polymelamine (PM) composite. The GR/PM composite modified electrode was prepared by electropolymerization of melamine on GR modified GCE. The as-prepared GR/PM composite was characterized by scanning electron microscopy, elemental mapping and Fourier transform infrared spectroscopy. The GR/PM composite modified GCE was used as electrocatalyst for oxidation of GA, and the composite modified electrode shows an enhanced catalytic activity than electrodes modified with GR and PM. Under optimum conditions, amperometric i-t was used to determine the GA, and the amperometric response of GA was linear over the concentration ranging from 0.1 to 728.9 μM. The limit of detection and sensitivity of the sensor was estimated as 0.027 μM and 0.697 μAμM-1 cm-2, respectively. The GR/PM composite modified electrode exhibits high selectivity in the presence of range of potentially interfering polyphenol compounds, dopamine, uric acid and ascorbic acid. As a proof of concept, the practicality of the sensors was examined in green tea samples, and shows acceptable practicality for the determination of GA.",

keywords = "Amperometry, Electro-oxidation, Gallic acid, Graphene, Poly(melamine)",

author = "Chen, {Tse Wei} and Selvakumar Palanisamy and Chen, {Shen Ming} and Vijayalakshmi Velusamy and Ramaraj, {Sayee Kannan}",

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AU - Palanisamy, Selvakumar

AU - Chen, Shen Ming

AU - Velusamy, Vijayalakshmi

AU - Ramaraj, Sayee Kannan

PY - 2017/5/1

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N2 - The present work describes an amperometric determination of gallic acid (GA) using a glassy carbon electrode (GCE) modified with graphene (GR) and polymelamine (PM) composite. The GR/PM composite modified electrode was prepared by electropolymerization of melamine on GR modified GCE. The as-prepared GR/PM composite was characterized by scanning electron microscopy, elemental mapping and Fourier transform infrared spectroscopy. The GR/PM composite modified GCE was used as electrocatalyst for oxidation of GA, and the composite modified electrode shows an enhanced catalytic activity than electrodes modified with GR and PM. Under optimum conditions, amperometric i-t was used to determine the GA, and the amperometric response of GA was linear over the concentration ranging from 0.1 to 728.9 μM. The limit of detection and sensitivity of the sensor was estimated as 0.027 μM and 0.697 μAμM-1 cm-2, respectively. The GR/PM composite modified electrode exhibits high selectivity in the presence of range of potentially interfering polyphenol compounds, dopamine, uric acid and ascorbic acid. As a proof of concept, the practicality of the sensors was examined in green tea samples, and shows acceptable practicality for the determination of GA.

AB - The present work describes an amperometric determination of gallic acid (GA) using a glassy carbon electrode (GCE) modified with graphene (GR) and polymelamine (PM) composite. The GR/PM composite modified electrode was prepared by electropolymerization of melamine on GR modified GCE. The as-prepared GR/PM composite was characterized by scanning electron microscopy, elemental mapping and Fourier transform infrared spectroscopy. The GR/PM composite modified GCE was used as electrocatalyst for oxidation of GA, and the composite modified electrode shows an enhanced catalytic activity than electrodes modified with GR and PM. Under optimum conditions, amperometric i-t was used to determine the GA, and the amperometric response of GA was linear over the concentration ranging from 0.1 to 728.9 μM. The limit of detection and sensitivity of the sensor was estimated as 0.027 μM and 0.697 μAμM-1 cm-2, respectively. The GR/PM composite modified electrode exhibits high selectivity in the presence of range of potentially interfering polyphenol compounds, dopamine, uric acid and ascorbic acid. As a proof of concept, the practicality of the sensors was examined in green tea samples, and shows acceptable practicality for the determination of GA.

KW - Amperometry

KW - Electro-oxidation

KW - Gallic acid

KW - Graphene

KW - Poly(melamine)

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A novel amperometric gallic acid sensor based on polymelamine entrapped graphene composite

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