Synergistic Exploitation of the Superoxide Scavenger Properties of Reduced Graphene Oxide and a Trityl Organic Radical for the Impedimetric Sensing of Xanthine

Gonca Seber, Jose Muñoz, Stefania Sandoval, Concepció Rovira, Gerard Tobias, Marta Mas-Torrent, Núria Crivillers

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    5 Citations (Scopus)

    Abstract

    © 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim This work is based on synergetically exploiting the activity of graphene-based materials and trityl free radicals to sense xanthine (X) by their combined scavenging properties for superoxide anion radical (O2•−). For this, reduced graphene oxide (rGO) and rGO covalently functionalized with a perchlorotriphenylmethyl (PTM) radical derivative (rGO@PTM) are synthesized, characterized, and casted on an electrode surface to achieve a highly sensitive electrochemical recognition platform for xanthine determination. The electrochemical analysis is based on impedimetrically monitoring a radical-involved reaction on the graphene-based electrode surface after reacting with such O2•− derived from the xanthine/xanthine oxidase enzymatic system. The presented strategy yields to determine X at nm levels, decreasing the detection limit 100 times with respect to previously reported (bio)sensors.
    Original languageEnglish
    Article number1701072
    JournalAdvanced Materials Interfaces
    Volume5
    Issue number2
    DOIs
    Publication statusPublished - 23 Jan 2018

    Keywords

    • reduced graphene oxide
    • superoxide anion radical
    • trityl radical
    • xanthine sensor

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