En la actualidad, el uso de lenguas electrónicas ha cobrado importancia en la industria de alimentos, debido al crecimiento de la tecnología y su aprovechamiento en este sector. En el presente trabajo se muestra la elaboración y optimización de una red de sensores a base de polipirrol, el cual fue dopado con diferentes especies químicas para la modificación de una red de sensores de carbono como primera etapa de una lengua electrónica para el análisis de leche. Se analizó la estabilidad y variabilidad en la respuesta presentada por cada sensor mediante la aplicación de una técnica electroquímica conocida como voltametría cíclica, que se aplicó a través de dichos sensores a las muestras analizadas. Para el estudio de los datos se empleó un método estadístico de reconocimiento de patrones conocido como análisis de componentes principales (PCA) y para la optimización de los sensores modificados se usó el análisis de superficie de respuestas. Los resultados obtenidos demuestran que debido a la optimización de los sensores se generó una respuesta estable y con menor ruido en las señales respecto a los mismos sensores sin modificar. Se demostró la capacidad de esta red para responder diferente ante muestras de leche de diversa naturaleza.
In this review is shown the development of an electronic portable system of electrochemical measurements based on PSoC technology and Android, which characterizes materials across the cyclic voltammetry technique. For the application of the above mentioned technique, it is necessary a potentiostat, this one induces a potential ramp in a substance while obtaining current signals of the substance. The aim of this work is to increase the access to the techniques of electrochemical analysis of materials in educational contexts, considering that the use of a commercial team of these characteristics is limited by factors as its high cost and its big size, which causes its difficult acquisition in some laboratories. With the PSoC technology it was possible to develop a potentiostat inside of a chip, since it contains analogical and digital reconfigurable blocks into it. In this work a Free SoC 2 card was used, which has as a main element PSoC5® and it was programmed in the software PSoC Creator. Additionally, the design of an Android app is shown, which is capable of connecting via Bluetooth with the PSoC circuit and graphic the voltage and current answers obtained during the application of the technique.
In this paper the development of a multichannel portable electrochemical device based on PSoC technology (Programmable System on Chip) is shown, which enables the execution of an electrochemical technique for signal acquisition known as cyclic voltammetry, and an Android application with communication by Bluetooth to control the device developed. These elements are coupled as signal processing stages and data processing of an electronic tongue, with the aim to discriminate and classify milk samples according to their taste properties. The development of the device was made on a single chip, thanks to the benefits provided by the PSoC technology, FreeSoC card inside contains a PSoC5 LP chip, in which was set a whole electrochemical electronic measurement system through programming environment PSoC Creator. The Android application was developed from the Android Studio programming environment, in which two corresponding activities were designed to control device for signal acquisition and recording of these signals in a database. The technique of cyclic voltammetry was applied in three samples of milk with different taste properties and could observe the system's ability to respond with unique patterns against each substance, additionally a statistical method known Principal
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