2024-03-29T00:13:13Zhttp://uvadoc.uva.es/oai/requestoai:uvadoc.uva.es:10324/409572021-06-24T07:46:49Zcom_10324_31661com_10324_952com_10324_894com_10324_1186com_10324_931col_10324_31662col_10324_1404
Discrimination of milks with a multisensor system based on layer-by-layer films
Salvo Comino, Coral
García Hernández, Celia
García Cabezón, Ana Cristina
Rodríguez Méndez, María Luz
Electronic tongue
Lengua electrónica
Milk
Leche
Ionic liquid
Líquido iónico
Multisensor systems
Sistemas multisensores
Producción Científica
A nanostructured electrochemical bi-sensor system for the analysis of milks has been developed using the layer-by-layer technique. The non-enzymatic sensor [CHI+IL/CuPcS]2, is a layered material containing a negative film of the anionic sulfonated copper phthalocyanine (CuPcS) acting as electrocatalytic material, and a cationic layer containing a mixture of an ionic liquid (IL) (1-butyl-3-methylimidazolium tetrafluoroborate) that enhances the conductivity, and chitosan (CHI), that facilitates the enzyme immobilization. The biosensor ([CHI+IL/CuPcS]2-GAO) results from the immobilization of galactose oxidase on the top of the LbL layers. FTIR, UV–vis, and AFM have confirmed the proposed structure and cyclic voltammetry has demonstrated the amplification caused by the combination of materials in the film. Sensors have been combined to form an electronic tongue for milk analysis. Principal component analysis has revealed the ability of the sensor system to discriminate between milk samples with different lactose content. Using a PLS-1 calibration models, correlations have been found between the voltammetric signals and chemical parameters measured by classical methods. PLS-1 models provide excellent correlations with lactose content. Additional information about other components, such as fats, proteins, and acidity, can also be obtained. The method developed is simple, and the short response time permits its use in assaying milk samples online.
Ministerio de Economía, Industria y Competitividad - Fondo Europeo de Desarrollo Regional (project AGL2015-67482-R)
Junta de Castilla y Leon - Fondo Europeo de Desarrollo Regional (project VA-011U16)
Junta de Castilla y León (grant BOCYL-D-4112015-9)
2020-05-29T11:52:03Z
2020-05-29T11:52:03Z
2018
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Sensors, 2018, vol. 18, n. 8. 12 p.
1424-8220
http://uvadoc.uva.es/handle/10324/40957
10.3390/s18082716
eng
https://www.mdpi.com/1424-8220/18/8/2716
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-nd/4.0/
© 2018 MDPI
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http://creativecommons.org/licenses/by-nc-nd/4.0/
UVaDOC. Repositorio Documental de la Universidad de Valladolid
http://uvadoc.uva.es/handle/10324/40957