title: Proof of concept of using chromogenic arrays as a tool to identify blue cheese varieties.
abstract: A new chromogenic array for the identification and classification of blue cheeses has been developed. It is based on the response of a chromogenic array composed of five sensing materials prepared by the incorporation of pH indicators to MCM-41 and alumina. Four blue cheeses were tested: Roquefort, Blue Stilton, blue cheese with leaves and blue cheese spread. The colour modulations of the chromogenic array were processed by the principal component analysis (PCA) and partial least squares discriminant analysis (PLS-DA). The statistical PCA analysis showed different responses to each cheese. PLS-DA models were developed by incorporating the data measured at diverse times, and this approach allowed us to obtain a perfect classification of all five cheeses in 5.5h. The results suggest that chromogenic arrays and optoelectronic noses can be a suitable approach to develop simple systems to classify blue cheeses and of potential use for the detection of food fraud.
authors.affiliation: Centro de Reconocimiento Molecular y Desarrollo Tecnológico, Unidad Mixta Universitat Politècnica de València-Universitat de València, Camino de Vera s/n, 46022 Valencia, Spain.
authors.forename: Patricia
authors.initials: P
authors.lastname: Zaragozá
authors.affiliation: Centro de Reconocimiento Molecular y Desarrollo Tecnológico, Unidad Mixta Universitat Politècnica de València-Universitat de València, Camino de Vera s/n, 46022 Valencia, Spain. Electronic address: joroli@upvnet.upv.es.
authors.forename: José V
authors.initials: JV
authors.lastname: Ros-Lis
authors.affiliation: Centro de Reconocimiento Molecular y Desarrollo Tecnológico, Unidad Mixta Universitat Politècnica de València-Universitat de València, Camino de Vera s/n, 46022 Valencia, Spain; CIBER de Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), Spain.
authors.forename: José-Luis
authors.initials: JL
authors.lastname: Vivancos
authors.affiliation: Centro de Reconocimiento Molecular y Desarrollo Tecnológico, Unidad Mixta Universitat Politècnica de València-Universitat de València, Camino de Vera s/n, 46022 Valencia, Spain; CIBER de Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), Spain.
authors.forename: Ramón
authors.initials: R
authors.lastname: Martínez-Máñez
mesh_terms: D002611:Cheese / Q000032:analysis* / Q000145:classification; D002623:Chemistry Techniques, Analytical / Q000379:methods*; D016002:Discriminant Analysis; D016018:Least-Squares Analysis; D025341:Principal Component Analysis
keywords: Blue cheese; Chromogenic sensors; Food classification; Optoelectronic nose