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03 January 2018
Gonca Seber, Jose Muñoz, Stefania Sandoval, Concepció Rovira, Gerard Tobias, Marta Mas-Torrent, Núria Crivillers. Advanced Materials Interfaces. 2017, 1701072, DOI: 10.1002/admi.201701072

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.

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Bioactive materials for therapy and diagnosis

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