title: Development of an active food packaging system with antioxidant properties based on green tea extract.
abstract: A formula including green tea extract (GTE) was developed as an active food packaging material. This formula was moulded to obtain an independent component/device with antioxidant properties that could be easily coupled to industrial degassing valves for food packaging in special cases. GTE components (i.e., gallic acid, catechins and caffeine) were identified and quantified by HPLC-UV and UPLC-MS and migration/diffusion studies were carried out. Antioxidant properties of the formula alone and formula-valve were measured with static and dynamic methods. The results showed that the antioxidant capacity (scavenging of free radicals) of the new GTE formula was 40% higher than the non-active system (blank). This antioxidant activity increased in parallel with the GTE concentration. The functional properties of the industrial target valve (e.g., flexibility) were studied for different mixtures of GTE, and good results were found with 17% (w/w) of GTE. This new active formula can be an important addition for active packaging applications in the food packaging industry, with oxidative species-scavenging capacity, thus improving the safety and quality for the consumer and extending the shelf-life of the packaged food.
authors.affiliation: a Aragon Institute of Engineering Research (I3A), EINA, GUIA group, Department of Analytical Chemistry , University of Zaragoza , Zaragoza , Spain.
authors.forename: Daniel
authors.initials: D
authors.lastname: Carrizo
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Gullo
authors.forename: Osvaldo
authors.initials: O
authors.lastname: Bosetti
authors.forename: Cristina
authors.initials: C
authors.lastname: Nerín
mesh_terms: D000975:Antioxidants / Q000737:chemistry*; D002110:Caffeine / Q000737:chemistry; D028241:Camellia sinensis / Q000737:chemistry; D002392:Catechin / Q000031:analogs & derivatives / Q000737:chemistry; D004058:Diffusion; D018857:Food Packaging / Q000295:instrumentation / Q000379:methods*; D005519:Food Preservation / Q000379:methods; D059022:Food Safety / Q000379:methods; D016166:Free Radical Scavengers / Q000737:chemistry; D005707:Gallic Acid / Q000737:chemistry; D006801:Humans; D010936:Plant Extracts / Q000737:chemistry; D013662:Tea / Q000737:chemistry*
chemical_list: D000975:Antioxidants; D016166:Free Radical Scavengers; D010936:Plant Extracts; D013662:Tea; D002110:Caffeine; D005707:Gallic Acid; D002392:Catechin