RT info:eu-repo/semantics/article
T1 Discrimination of milks with a multisensor system based on layer-by-layer films
A1 Salvo Comino, Coral
A1 García Hernández, Celia
A1 García Cabezón, Ana Cristina
A1 Rodríguez Méndez, María Luz
K1 Electronic tongue
K1 Lengua electrónica
K1 Milk
K1 Leche
K1 Ionic liquid
K1 Líquido iónico
K1 Multisensor systems
K1 Sistemas multisensores
AB 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.
PB MDPI
SN 1424-8220
YR 2018
FD 2018
LK http://uvadoc.uva.es/handle/10324/40957
UL http://uvadoc.uva.es/handle/10324/40957
LA eng
NO Sensors, 2018, vol. 18, n. 8. 12 p.
NO Producción Científica
DS UVaDOC
RD 26-abr-2024