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    Por favor, use este identificador para citar o enlazar este ítem:http://uvadoc.uva.es/handle/10324/30599

    Título
    Analysis of organic acids and phenols of interest in the wine industry using Langmuir–Blodgett films based on functionalized nanoparticles
    Autor
    Medina Plaza, CristinaAutoridad UVA
    García Cabezón, Ana CristinaAutoridad UVA Orcid
    García Hernández, CeliaAutoridad UVA
    Bramorski, Camila
    Blanco Val, María YolandaAutoridad UVA Orcid
    Martín Pedrosa, FernandoAutoridad UVA Orcid
    Kawai, Takeshi
    Rodríguez Méndez, María LuzAutoridad UVA Orcid
    Año del Documento
    2015
    Editorial
    Elsevier
    Documento Fuente
    Analytica Chimica Acta vol. 583 p. 572-578
    Zusammenfassung
    A chemically modified electrode consisting of Langmuir–Blodgett (LB) films of n-dodecanethiol functionalized gold nanoparticles (SDODAuNP-LB), was investigated as a voltammetric sensor of organic and phenolic acids of interest in the wine industry. The nanostructured films demonstrated interfacial properties being able to detect the main organic acids present in grapes and wines (tartaric, malic, lactic and citric). Compared to a bare ITO electrode, the modified electrodes exhibited a shift of the reduction potential in the less positive direction and a marked enhancement in the current response. Moreover, the increased electrocatalytic properties made it possible to distinguish between the different dissociable protons of polyprotic acids. The SDODAuNP-LB sensor was also able to provide enhanced responses toward aqueous solutions of phenolic acids commonly found in wines (caffeic and gallic acids). The presence of nanoparticles increased drastically the sensitivity toward organic acids and phenolic compounds. Limits of detection as low as 10−6 mol L−1 were achieved. Efficient catalytic activity was also observed in mixtures of phenolic acid/tartaric in the range of pHs typically found in wines. In such mixtures, the electrode was able to provide simultaneous information about the acid and the phenol concentrations with a complete absence of interferences. The excellent sensing properties shown by these sensors could be attributed to the electrocatalytic properties of the nanoparticles combined with the high surface to volume ratio and homogeneity provided by the LB technique used for the immobilization. Moreover, the LB technique also provided an accurate method to immobilize the gold nanoparticles giving rise to stable and reproducible sensors showing repeatability lower than 2% and reproducibility lower than 4% for all the compounds analyzed.
    ISSN
    0003-2670
    Revisión por pares
    SI
    Patrocinador
    unta de Castilla y León (programa de apoyo a proyectos de investigación - Ref. VA-032U13)
    Ministerio de Economía, Industria y Competitividad – FEDER (Grant CICYT AGL2012-33535)
    Idioma
    eng
    URI
    http://uvadoc.uva.es/handle/10324/30599
    Derechos
    openAccess
    Aparece en las colecciones
    • BioEcoUVa - Artículos de revista [195]
    • DEP63 - Artículos de revista [324]
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