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dc.contributor.authorMedina Plaza, Cristina
dc.contributor.authorGarcía Cabezón, Ana Cristina 
dc.contributor.authorGarcía Hernández, Celia 
dc.contributor.authorBramorski, Camila
dc.contributor.authorBlanco Val, María Yolanda 
dc.contributor.authorMartín Pedrosa, Fernando 
dc.contributor.authorKawai, Takeshi
dc.contributor.authorRodríguez Méndez, María Luz 
dc.date.accessioned2018-07-11T09:53:17Z
dc.date.issued2015
dc.identifier.citationAnalytica Chimica Acta vol. 583 p. 572-578es
dc.identifier.issn0003-2670es
dc.identifier.urihttp://uvadoc.uva.es/handle/10324/30599
dc.description.abstractA 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.es
dc.format.mimetypeapplication/pdfes
dc.language.isoenges
dc.publisherElsevieres
dc.rights.accessRightsinfo:eu-repo/semantics/openAccesses
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/
dc.titleAnalysis of organic acids and phenols of interest in the wine industry using Langmuir–Blodgett films based on functionalized nanoparticleses
dc.typeinfo:eu-repo/semantics/articlees
dc.peerreviewedSIes
dc.description.embargo2022-07-7es
dc.description.lift2022-07-07
dc.description.projectunta de Castilla y León (programa de apoyo a proyectos de investigación - Ref. VA-032U13)
dc.description.projectMinisterio de Economía, Industria y Competitividad – FEDER (Grant CICYT AGL2012-33535)
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 International


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