Food quality indicator device

Details Food quality indicator device Food quality indicator device

G - Physics

01

N

G01N 31/22 (2006.01) G01N 33/02 (2006.01)

Patent

CA 2268477

A food quality indicator device comprising an indicator compound provided on a substrate. The indicator compound changes color due to the presence of volatile compounds, such as volatile bases, in spoiled food, even when the food is frozen. Alternatively, the indicator compound detects the presence of an unwanted amine-producing biological agent, such as bacteria or fungi. The indicator compound is typically contained within a polymeric matrix disposed on the substrate. Examples of suitable indicator compounds include halogenated azo dyes, sulfonated xanthene dyes, and sulfonated hydroxy-functional triphenylmethane dyes.

L'invention concerne un dispositif indicateur de la qualité de aliments, comprenant un composé indicateur placé sur un substrat. Le composé indicateur change de couleur en présence de composés volatils tels que des bases volatiles apparaissant dans la nourriture avariée, même lorsque la nourriture est congelée. Le composé indicateur détecte en outre la présence d'agents biologiques indésirables producteurs d'amines tels que bactéries ou champignons. Le composé indicateur est normalement contenu dans une matrice polymère disposées sur le substrat. Les composés indicateurs qui conviennent sont par exemple les colorants azoïques halogénés, les colorants xanthène sulfoné et les colorants triphénylméthane sulfoné à fonctionnalité hydroxy.

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