Journal
ADVANCED MATERIALS INTERFACES
Volume 5, Issue 2, Pages -Publisher
WILEY
DOI: 10.1002/admi.201701072
Keywords
reduced graphene oxide; superoxide anion radical; trityl radical; xanthine sensor
Funding
- Future and Emerging Technologies (FET) ACMOL [618082]
- European Research Council (ERC) [StG 2012-306826 e-GAMES]
- Direccion General de Investigacion (DGI) (Spain) [FANCY CTQ2016-80030-R]
- Generalitat de Catalunya [2014-SGR-17]
- Spanish Ministry of Economy and Competitiveness, through the Severo Ochoa Programme for Centers of Excellence in RD [SEV-2015-0496]
- project challenges in inorganic materials for enegery applications (CHALENG) [MAT2014-53500-R]
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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 (O-2(center dot-)). 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 O-2(center dot-) 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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