title: Chemically Modified Graphene: The Influence of Structural Properties on the Assessment of Antioxidant Capacity.
abstract: Graphene materials obtained by different synthetic routes possess dissimilar amount of defects and surface functionalities, which can influence their electrochemical performance towards the detection of electroactive probes. Oxygen-containing groups can be either detrimental to the heterogeneous charge transfer or promote favorable interactions between the graphene surface and the analyte of interest, depending on the structure of the latter. Here, we compared three chemically modified graphenes, obtained by various procedures and carrying different amounts of oxygen functionalities, for the detection of standard gallic acid, a compound commonly used as an index of the antioxidant capacity of food and beverages. We found that electrochemically reduced graphene provided the best electrochemical performance in terms of calibration sensitivity, selectivity, and linearity of response. Our findings are important in order to understand the suitability of graphene platforms for the assessment of food quality.
authors.affiliation: Division of Chemistry & Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371 (Singapore), Fax: (+65) 6791-1961.
authors.forename: Kai Hwee
authors.initials: KH
authors.lastname: Hui
authors.affiliation: Division of Chemistry & Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371 (Singapore), Fax: (+65) 6791-1961.
authors.forename: Martin
authors.initials: M
authors.lastname: Pumera
authors.affiliation: Division of Chemistry & Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371 (Singapore), Fax: (+65) 6791-1961. a.bonanni@ntu.edu.sg.
authors.forename: Alessandra
authors.initials: A
authors.lastname: Bonanni
mesh_terms: D000975:Antioxidants / Q000737:chemistry* / Q000494:pharmacology*; D055664:Electrochemical Techniques; D006108:Graphite / Q000737:chemistry*; D010084:Oxidation-Reduction; D010100:Oxygen / Q000737:chemistry*
chemical_list: D000975:Antioxidants; D006108:Graphite; D010100:Oxygen
keywords: antioxidant capacity; gallic acid; graphene; oxygen-containing groups