Study of the methanol concentration in commercial wines and its influence on the detection of quality and possible adulteration of wines
En el presente estudio, se evaluó la variación de la sensibilidad de los sensores preparados a partir de SnO2 dopados con Pt, al contacto con distintas concentraciones de metanol presente en los vinos peruanos utilizando un arreglo de sensores (narices electrónicas), con la finalidad de encontrar qué sensores eran los más apropiados para diferenciar vinos comerciales de los adulterados, se encontró que el metanol se encuentra en un mayor porcentaje en los vinos adulterados que en los comerciales. Los sensores de Pt-SnO2 recubiertos con zeolita Y fueron los que presentaron una mayor detección de este alcohol. La zeolita puede actuar como un elemento selectivo, sobre todo en los sensores dopados con platino.
En el análisis de componentes principales (PCA) obtenidos se observó una buena varianza total (Falta indicar el valor) en los resultados tanto para la Nariz 1 como para la Nariz 2 (mayor al 70%) con correlaciones cercanas a cero, lo que indica la independencia de las observaciones.
Con la Nariz 1, construida por sensores a base de Pt-SnO2, se logró una buena diferenciación de los vinos peruanos de marcas conocidas respecto a los de marcas desconocidas (posibles vinos adulterados) al aplicarse el método PCA. Mediante el análisis clúster y el Análisis Factorial se corroboraron los resultados obtenidos del PCA. Adicionalmente, con el Análisis Factorial se obtuvo un alto valor en la varianza (99,26%) de los dos factores.
Study of the methanol concentration in commercial wines and its influence on the detection of quality and possible adulteration of wines
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DOI: 10.22533/at.ed.3173112304046
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Palavras-chave: vinos, vinos posiblemente adulterados, alcoholes en vinos, análisis multivariado.
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Keywords: wines, possibly adulterated wines, alcohols in wines, multivariate analysis.
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Abstract:
In the present study, the variation of the sensitivity of the sensors prepared from SnO2 doped with Pt, in contact with different concentrations of methanol present in Peruvian wines using an array of sensors (electronic noses), in order to find which sensors were the most appropriate to differentiate commercial wines from adulterated ones, it was found that methanol It is found in a higher percentage in adulterated wines than in commercial ones. sensors Pt-SnO2 coated with zeolite Y were the ones that presented a higher detection of this alcohol. Zeolite can act as a selective element, especially in platinum-doped sensors.
In the principal component analysis (PCA) obtained, a good total variance was observed (the value is missing) in the results for both Nose 1 and Nose 2 (greater than 70%) with correlations close to zero, which indicates the independence of the observations.
With Nose 1, built by sensors based on Pt-SnO2, a good differentiation of Peruvian wines of known brands was achieved with respect to those of unknown brands (possible adulterated wines) when applying the PCA method. Through the cluster analysis and the Factorial Analysis, the results obtained from the PCA were corroborated. Additionally, with the Factorial Analysis a high value was obtained in the variance (99.26%) of the two factors.
- Ana Lucía Paredes Doig
