Articles producció científica> Enginyeria Química

Electrochemical detection of nitrite and ascorbic acid at glassy carbon electrodes modified with carbon nano-onions bearing electroactive moieties

  • Identification data

    Identifier: imarina:5131726
    Handle: https://hdl.handle.net/20.500.11797/imarina5131726
    Authors:
    Bartolome, Joanne PFragoso, Alex
    Abstract:
    In this work, we evaluate two novel surfaces for the simultaneous detection of nitrite and ascorbic acid in aqueous media. Glassy carbon electrodes were first modified with small carbon nano-onions (GCE/CNO) and further functionalized either by electrografting ortho-aminophenol (oAP) groups or by physical adsorption of thionine to give electroactive surfaces that were characterized by cyclic voltammetry. The modified surfaces exhibited a fast electrochemical response and were able to detect the presence of nitrite and ascorbic acid by amperometry. The presence of both CNOs and the electroactive moiety on the electrode surface enhanced the sensitivity and lowered the limit of detection of the determinations as compared to GCE modified only with oAP or thionine. The CNO-modified electrodes showed good reproducibility and stability with time and were applied in the detection of ascorbic acid in orange juice.

  • Others:

    Author, as appears in the article.: Bartolome, Joanne P; Fragoso, Alex
    Department: Enginyeria Química
    URV's Author/s: Fragoso Sierra, Alex
    Keywords: Vitamin-c Uric-acid Surfaces Spectrophotometric determination Reduction Oxidation Nitrate Nanotubes Cured meat Chemistry
    Abstract: In this work, we evaluate two novel surfaces for the simultaneous detection of nitrite and ascorbic acid in aqueous media. Glassy carbon electrodes were first modified with small carbon nano-onions (GCE/CNO) and further functionalized either by electrografting ortho-aminophenol (oAP) groups or by physical adsorption of thionine to give electroactive surfaces that were characterized by cyclic voltammetry. The modified surfaces exhibited a fast electrochemical response and were able to detect the presence of nitrite and ascorbic acid by amperometry. The presence of both CNOs and the electroactive moiety on the electrode surface enhanced the sensitivity and lowered the limit of detection of the determinations as compared to GCE modified only with oAP or thionine. The CNO-modified electrodes showed good reproducibility and stability with time and were applied in the detection of ascorbic acid in orange juice.
    Thematic Areas: Zootecnia / recursos pesqueiros Química Physical and theoretical chemistry Medicina ii Medicina i Materials chemistry Materiais Interdisciplinar Inorganic chemistry Farmacia Engenharias ii Engenharias i Ciências biológicas ii Ciências biológicas i Ciências ambientais Ciências agrárias i Ciência de alimentos Chemistry, inorganic & nuclear Biotecnología Biodiversidade Astronomia / física
    licence for use: https://creativecommons.org/licenses/by/3.0/es/
    Author's mail: alex.fragoso@urv.cat
    Author identifier: 0000-0003-4839-6094
    Record's date: 2024-10-12
    Papper version: info:eu-repo/semantics/acceptedVersion
    Licence document URL: https://repositori.urv.cat/ca/proteccio-de-dades/
    Papper original source: Inorganica Chimica Acta. 468 223-231
    APA: Bartolome, Joanne P; Fragoso, Alex (2017). Electrochemical detection of nitrite and ascorbic acid at glassy carbon electrodes modified with carbon nano-onions bearing electroactive moieties. Inorganica Chimica Acta, 468(), 223-231. DOI: 10.1016/j.ica.2017.06.024
    Entity: Universitat Rovira i Virgili
    Journal publication year: 2017
    Publication Type: Journal Publications

  • Keywords:

    Chemistry, Inorganic & Nuclear,Inorganic Chemistry,Materials Chemistry,Physical and Theoretical Chemistry
    Vitamin-c
    Uric-acid
    Surfaces
    Spectrophotometric determination
    Reduction
    Oxidation
    Nitrate
    Nanotubes
    Cured meat
    Chemistry
    Zootecnia / recursos pesqueiros
    Química
    Physical and theoretical chemistry
    Medicina ii
    Medicina i
    Materials chemistry
    Materiais
    Interdisciplinar
    Inorganic chemistry
    Farmacia
    Engenharias ii
    Engenharias i
    Ciências biológicas ii
    Ciências biológicas i
    Ciências ambientais
    Ciências agrárias i
    Ciência de alimentos
    Chemistry, inorganic & nuclear
    Biotecnología
    Biodiversidade
    Astronomia / física

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