Determination of vanillin by using gold nanoparticle-modified screen-printed carbon electrode modified with graphene quantum dots and Nafion.

Autor: Durán GM; Department of Analytical Chemistry and Food Technology, University of Castilla-La Mancha, Camilo José Cela Av, E-13071, Ciudad Real, Spain.; Regional Institute for Applied Chemistry Research (IRICA), Camilo José Cela Av, E-13071, Ciudad Real, Spain., Llorent-Martínez EJ; Department of Analytical Chemistry and Food Technology, University of Castilla-La Mancha, Camilo José Cela Av, E-13071, Ciudad Real, Spain.; Regional Institute for Applied Chemistry Research (IRICA), Camilo José Cela Av, E-13071, Ciudad Real, Spain., Contento AM; Department of Analytical Chemistry and Food Technology, University of Castilla-La Mancha, Camilo José Cela Av, E-13071, Ciudad Real, Spain.; Regional Institute for Applied Chemistry Research (IRICA), Camilo José Cela Av, E-13071, Ciudad Real, Spain., Ríos Á; Department of Analytical Chemistry and Food Technology, University of Castilla-La Mancha, Camilo José Cela Av, E-13071, Ciudad Real, Spain. Angel.Rios@uclm.es.; Regional Institute for Applied Chemistry Research (IRICA), Camilo José Cela Av, E-13071, Ciudad Real, Spain. Angel.Rios@uclm.es.
Jazyk: angličtina
Zdroj: Mikrochimica acta [Mikrochim Acta] 2018 Mar 03; Vol. 185 (3), pp. 204. Date of Electronic Publication: 2018 Mar 03.
DOI: 10.1007/s00604-018-2738-1
Abstrakt: A voltammetric analytical assay for the selective quantification of vanillin is described. It is based on the use of a gold nanoparticle-modified screen-printed carbon electrode (SPCE) modified with graphene quantum dots (GQD) in a Nafion matrix. The GQD were synthesized by an acidic thermal method and characterized by UV-Vis, photoluminescence, and FTIR spectroscopy. The modified SPCE displays a strongly enhanced response to vanillin. Linear sweep voltammetry (LSV) and differential pulse voltammetry (DPV) were applied to optimize the methods. The analytical assay has linear responses in the 13 to 660 μM and 0.66 to 33 μM vanillin concentration ranges. The detection limits are 3.9 μM and 0.32 μM when using LSV and DPV, respectively. The analytical assay is selective and stable. It was applied to the determination of vanillin in several food samples with satisfactory results. Recoveries from spiked samples ranged between 92.1 and 113.0%. Graphical abstract The selective and sensitive quantification of vanillin is carried out by the use of a gold nanoparticle-modified screen-printed carbon electrode modified with graphene quantum dots in a Nafion matrix.
Databáze: MEDLINE
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