Carbon dioxide colorimetric indicators for food packaging application: Applicability of anthocyanin and poly-lysine mixtures
| Autor: | Francesco Saliu, Roberto Della Pergola |
|---|---|
| Přispěvatelé: | Saliu, F, Della Pergola, R |
| Rok vydání: | 2018 |
| Předmět: |
Anthocyanin
Food spoilage Lysine 02 engineering and technology 01 natural sciences Matrix (chemical analysis) chemistry.chemical_compound CHIM/06 - CHIMICA ORGANICA Materials Chemistry Food science Electrical and Electronic Engineering Instrumentation Smart packaging CHIM/03 - CHIMICA GENERALE E INORGANICA ε-polylysine (EPL) 010401 analytical chemistry Metals and Alloys carbon dioxide polylysine Permeation 021001 nanoscience & nanotechnology Condensed Matter Physics 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials CO Food packaging Indicator chemistry Distilled water Carbon dioxide 0210 nano-technology |
| Zdroj: | Sensors and Actuators B: Chemical. 258:1117-1124 |
| ISSN: | 0925-4005 |
| Popis: | Microbial spoilage of food is accompanied by a pronounced production of carbon dioxide (CO2). Sensors that visually highlight the presence of CO2 inside the food packages can be thereby used as labels for indicating the freshness of the marketed products. Moreover, the monitoring of the optimal CO2 level is also required under modified-atmosphere packaging (MAP) conditions, being this gas prone to permeate food and package materials. In this study we investigated the CO2 sensing performance of a food grade mixture constituted of an aminoacid (L-Lysine) a polypeptide (e-poly- l -lysine, EPL) and natural occurring dyes (anthocyanins). Test carried in distilled water showed that the mixture at 0.01% w/v concentration level was very reactive, turning from azure to purple colour in less than five minutes, even when exposed to 2.5% gaseous CO2. A reverse direction transition was also observed for the 0.1% w/v solution when the CO2 levels fall down below 20%. The system was then dissolved in a biopolymeric matrix giving a coating totally constituted of food grade ingredients and usable as colorimetric CO2 indicator for cold preserved food. |
| Databáze: | OpenAIRE |
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