title: Electrocatalytic Nanostructured Ferric Tannates: Characterization and Application of a Polyphenol Nanosensor.
abstract: A novel core-shell hybrid nanomaterial composed of peculiar maghemite nanoparticles (surface-active maghemite nanoparticles (SAMNs)) as the core and tannic acid (TA) as the shell was developed by self-assembly of ferric tannates onto the surface of SAMNs by simple incubation in water. The hybrid nanomaterial (SAMN@TA) was characterized by using UV/Vis, FTIR, and Mössbauer spectroscopies, magnetization measurements, and X-ray powder diffraction, which provide evidence of a drastic reorganization of the iron oxide surface upon reaction with TA and the formation of an outer shell that consists of a cross-linked network of ferric tannates. According to a Langmuir isotherm analysis, SAMN@TA offers one of most stable iron complexes of TA reported in the literature to date. Moreover, SAMN@TA was characterized by using electrical impedance spectroscopy, voltammetry, and chronoamperometry. The nanostructured ferric tannate interface showed improved conductivity and selective electrocatalytic activity toward the oxidation of polyphenols. Finally, a carbon-paste electrode modified with SAMN@TA was used for the determination of polyphenols in blueberry extracts by square-wave voltammetry.
authors.affiliation: Department of Comparative Biomedicine and Food Science, University of Padua, Agripolis, Viale dell'Università 16, Legnaro, 35020, PD, Italy.
authors.forename: Massimiliano
authors.initials: M
authors.lastname: Magro
authors.affiliation: Department of Comparative Biomedicine and Food Science, University of Padua, Agripolis, Viale dell'Università 16, Legnaro, 35020, PD, Italy.
authors.forename: Emanuela
authors.initials: E
authors.lastname: Bonaiuto
authors.affiliation: Department of Comparative Biomedicine and Food Science, University of Padua, Agripolis, Viale dell'Università 16, Legnaro, 35020, PD, Italy.
authors.forename: Davide
authors.initials: D
authors.lastname: Baratella
authors.affiliation: Department of Comparative Biomedicine and Food Science, University of Padua, Agripolis, Viale dell'Università 16, Legnaro, 35020, PD, Italy.
authors.forename: Jessica
authors.initials: J
authors.lastname: de Almeida Roger
authors.affiliation: Regional Centre for Advanced Technologies and Materials, Palacky University, 17., listopadu 1192/12, 771 46, Olomouc, Czech Republic.
authors.forename: Petr
authors.initials: P
authors.lastname: Jakubec
authors.affiliation: Department of Comparative Biomedicine and Food Science, University of Padua, Agripolis, Viale dell'Università 16, Legnaro, 35020, PD, Italy.
authors.forename: Vittorino
authors.initials: V
authors.lastname: Corraducci
authors.affiliation: Regional Centre for Advanced Technologies and Materials, Palacky University, 17., listopadu 1192/12, 771 46, Olomouc, Czech Republic.
authors.forename: Jiri
authors.initials: J
authors.lastname: Tuček
authors.affiliation: Regional Centre for Advanced Technologies and Materials, Palacky University, 17., listopadu 1192/12, 771 46, Olomouc, Czech Republic.
authors.forename: Ondrej
authors.initials: O
authors.lastname: Malina
authors.affiliation: Regional Centre for Advanced Technologies and Materials, Palacky University, 17., listopadu 1192/12, 771 46, Olomouc, Czech Republic.
authors.forename: Radek
authors.initials: R
authors.lastname: Zbořil
authors.affiliation: Department of Comparative Biomedicine and Food Science, University of Padua, Agripolis, Viale dell'Università 16, Legnaro, 35020, PD, Italy. fabio.vianello@unipd.it.|Regional Centre for Advanced Technologies and Materials, Palacky University, 17., listopadu 1192/12, 771 46, Olomouc, Czech Republic. fabio.vianello@unipd.it.
authors.forename: Fabio
authors.initials: F
authors.lastname: Vianello
mesh_terms: D002384:Catalysis; D055664:Electrochemical Techniques; D005290:Ferric Compounds / Q000737:chemistry*; D049329:Nanostructures / Q000737:chemistry*; D059808:Polyphenols / Q000032:analysis*; D013634:Tannins / Q000737:chemistry*
chemical_list: D005290:Ferric Compounds; D059808:Polyphenols; D013634:Tannins
keywords: electrochemistry; iron oxide; nanoparticles; organic-inorganic hybrid composites; tannic acid