2026-05-05T19:36:23Zhttps://uvadoc.uva.es/oai/request

oai:uvadoc.uva.es:10324/211082025-02-18T13:36:57Zcom_10324_31661com_10324_952com_10324_894com_10324_1186com_10324_931col_10324_31662col_10324_1404

00925njm 22002777a 4500 dc García Hernández, Celia author Medina Plaza, Cristina author García Cabezón, Ana Cristina author Martín Pedrosa, Fernando author Valle González, María Isabel del author Saja Saez, José Antonio De author Rodríguez Méndez, María Luz author 2015 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. Sensors, November 2015, vol. 15, n. 11, p. 29233-29249 1424-8220 http://uvadoc.uva.es/handle/10324/21108 10.3390/s151129233 29233 11 29249 An Electrochemical Quartz Crystal Microbalance Multisensor System Based on Phthalocyanine Nanostructured Films: Discrimination of Musts 15 LbL EQCM phthalocyanine must grapes electronic tongue An electrochemical quartz crystal microbalance multisensor system based on phthalocyanine nanostructured films: discrimination of musts