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Sensors and Actuators B Chemical
Article . 2020 . Peer-reviewed
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Robust label-free CuxCoyOz electrochemical sensors for hexose detection during fermentation process monitoring

Authors: Ester López-Fernández; Jorge Gil-Rostra; Juan P. Espinós; Ramon Gonzalez; Francisco Yubero; Antonio de Lucas-Consuegra; Agustín R. González-Elipe;

Robust label-free CuxCoyOz electrochemical sensors for hexose detection during fermentation process monitoring

Abstract

Label free electrochemical sensors of glucose are used whenever long-term operation and stable response are required. For this purpose, various metals and oxides of the first transition series have been proposed as alternative to more expensive noble metal electrochemical sensors. In this work we propose a new formulation consisting of copper-cobalt mixed oxides which, in the form of porous and nanostructured thin films with well controlled Co/Cu ratio, are prepared at room temperature in one step by a modification of the magnetron sputtering oblique angle deposition procedure. Films with various compositions were electrochemically characterized by cyclic voltammetry to determine their amperometric response to glucose as a function of voltage and NaOH electrolyte concentration. This analysis showed that films with a Co/Cu atomic ratio equal 3.4 presented a maximum sensitivity (0.710 A M−1 cm−2), a small limit of detection (0.105 μM) and a resilient behaviour upon cycling operation and long storage periods that clearly overpassed the performance of copper and cobalt single oxides. The CuxCoyO electrocatalysts also presented a good selectivity towards glucose and fructose in the presence of common interference compounds found in biological fluids (e.g., ascorbic acid, acetaminophen and uric acid), sucrose and ethanol, this latter present in many agrofood liquids. The possibilities of this sensor electrocatalyst have been tested for the analysis of a wine synthetic fermentation process. The comparison of the electrochemical results with conventional analytical methods showed a lineal amperometric response with respect hexose contents in a must at different stages of its transformation into wine. Los sensores electroquímicos de glucosa sin etiquetas se utilizan siempre que se requiere una operación a largo plazo y una respuesta estable. Para ello, se han propuesto varios metales y óxidos de la primera serie de transición como alternativa a los sensores electroquímicos de metales nobles más caros. En este trabajo proponemos una nueva formulación consistente en óxidos mixtos de cobre-cobalto que, en forma de películas delgadas porosas y nanoestructuradas con una relación Co/Cu bien controlada, se preparan a temperatura ambiente en un solo paso mediante una modificación del magnetrón por pulverización oblicua. procedimiento de deposición angular. Películas con varias composiciones fueron caracterizadas electroquímicamente por voltamperometría cíclica para determinar su respuesta amperométrica a la glucosa en función del voltaje y la concentración de electrolito NaOH. Este análisis mostró que las películas con una relación atómica Co/Cu igual a 3.−1 cm −2 ), un pequeño límite de detección (0,105 μM) y un comportamiento resistente a la operación cíclica y largos períodos de almacenamiento que superó claramente el rendimiento de los óxidos simples de cobre y cobalto. El Cu x Co yLos electrocatalizadores O también presentaron una buena selectividad hacia la glucosa y la fructosa en presencia de compuestos de interferencia comunes que se encuentran en los fluidos biológicos (p. ej., ácido ascórbico, paracetamol y ácido úrico), sacarosa y etanol, este último presente en muchos líquidos agroalimentarios. Las posibilidades de este electrocatalizador sensor han sido probadas para el análisis de un proceso de fermentación sintética de vino. La comparación de los resultados electroquímicos con los métodos analíticos convencionales mostró una respuesta amperométrica lineal con respecto al contenido de hexosas en un mosto en diferentes etapas de su transformación en vino.

Country
Spain
Keywords

Detección de glucosa sin etiquetas, Seguimiento de la fermentación, Copper-cobalt mixed oxides, Label-free glucose detection, Electrochemical detection, Óxidos mixtos de cobre y cobalto, Fermentation monitoring, Detección electroquímica

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
views
OpenAIRE UsageCountsViews provided by UsageCounts
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8
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