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 journalArticlepeer-review

    7 Scopus citations


    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 languageBritish English
    Pages (from-to)4107-4119
    Number of pages13
    JournalInternational Journal of Electrochemical Science
    Issue number5
    StatePublished - 1 May 2017


    • Amperometry
    • Electro-oxidation
    • Gallic acid
    • Graphene
    • Poly(melamine)


    Dive into the research topics of 'A novel amperometric gallic acid sensor based on polymelamine entrapped graphene composite'. Together they form a unique fingerprint.

    Cite this