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Title: An Electrochemical Quartz Crystal Microbalance Multisensor System Based on Phthalocyanine Nanostructured Films: Discrimination of Musts
Authors: García Hernández, Celia
Medina Plaza, Cristina
García Cabezón, Cristina
Martín Pedrosa, Fernando
del Valle, Isabel
de Saja, José Antonio
Rodríguez Méndez, María Luz
Issue Date: 2015
Publisher: MDPI
Description: Producción Científica
Citation: Sensors, November 2015, vol. 15, n. 11, p. 29233-29249
Abstract: An array of electrochemical quartz crystal electrodes (EQCM) modified with nanostructured films based on phthalocyanines was developed and used to discriminate musts prepared from different varieties of grapes. Nanostructured films of iron, nickel and copper phthalocyanines were deposited on Pt/quartz crystals through the Layer by Layer technique by alternating layers of the corresponding phthalocyanine and poly-allylamine hydrochloride. Simultaneous electrochemical and mass measurements were used to study the mass changes accompanying the oxidation of electroactive species present in must samples obtained from six Spanish varieties of grapes (Juan García, Prieto Picudo, Mencía Regadío, Cabernet Sauvignon, Garnacha and Tempranillo). The mass and voltammetric outputs were processed using three-way models. Parallel Factor Analysis (PARAFAC) was successfully used to discriminate the must samples according to their variety. Multi-way partial least squares (N-PLS) evidenced the correlations existing between the voltammetric data and the polyphenolic content measured by chemical methods. Similarly, N-PLS showed a correlation between mass outputs and parameters related to the sugar content. These results demonstrated that electronic tongues based on arrays of EQCM sensors can offer advantages over arrays of mass or voltammetric sensors used separately.
Keywords: LbL
electronic tongue
ISSN: 1424-8220
Peer Review: SI
DOI: 10.3390/s151129233
Sponsor: Ministerio de Economía, Industria y Competitividad – FEDER (Grant CICYT AGL2012-33535)
Junta de Castilla y León (programa de apoyo a proyectos de investigación - Ref. VA-032U13)
University of Valladolid (PIF-UVa)
Publisher Version:
Rights Owner: MDPI
Language: eng
Rights: info:eu-repo/semantics/openAccess
Appears in Collections:DEP63 - Artículos de revista

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