title: Influence of polymer matrix and adsorption onto silica materials on the migration of alpha-tocopherol into 95% ethanol from active packaging.
abstract: In this study, the effect of polymer materials with different polarity, namely low density polyethylene (LDPE) and ethylene vinyl acetate (EVA), on the migration behaviour of alpha-tocopherol from active packaging was investigated. The antioxidant was also adsorbed onto silica materials, namely SBA-15 (Santa Barbara-15) and Syloblock, in order to protect the antioxidant during extrusion and to ensure a controlled and sufficient release during the shelf-life of the food product. Migration experiments were performed at 7.0 +/- 0.5 degrees C and 95% ethanol was used as fatty food simulant. All films contained a high concentration of alpha-tocopherol, approximately 2000 mg kg(-1), to obtain an active packaging. Polymer matrix had a small influence on the migration profile. The migration of 80% of total migrated amount of antioxidant was retarded for 2.4 days by using LDPE instead of EVA. When alpha-tocopherol was adsorbed onto both silica materials, the migration of 80% of total migrated amount of antioxidant was retarded for 3.4 days in comparison to pure alpha-tocopherol. No difference was seen between the migration profiles of alpha-tocopherol adsorbed onto both silica materials. In the case of pure alpha-tocopherol, 82% of the initial amount of alpha-tocopherol in the film migrated into the food simulant at a rather fast migration rate. In the case of adsorption on silica materials, a total migration was observed. These antioxidative films can have positive food applications.
authors.affiliation: Ghent University, Department of Food Technology and Nutrition, Coupure Links, 6539000 Ghent, Belgium.
authors.forename: L
authors.initials: L
authors.lastname: Heirlings
authors.forename: I
authors.initials: I
authors.lastname: Siró
authors.forename: F
authors.initials: F
authors.lastname: Devlieghere
authors.forename: E
authors.initials: E
authors.lastname: Van Bavel
authors.forename: P
authors.initials: P
authors.lastname: Cool
authors.forename: B
authors.initials: B
authors.lastname: De Meulenaer
authors.forename: E F
authors.initials: EF
authors.lastname: Vansant
authors.forename: J
authors.initials: J
authors.lastname: Debevere
mesh_terms: D000327:Adsorption; D000975:Antioxidants / Q000737:chemistry; D004058:Diffusion; D004355:Drug Stability; D000431:Ethanol / Q000737:chemistry*; D018857:Food Packaging; D005519:Food Preservation / Q000379:methods; D006358:Hot Temperature; D020959:Polyethylene / Q000737:chemistry; D011108:Polymers / Q000737:chemistry*; D011145:Polyvinyls / Q000737:chemistry; D012822:Silicon Dioxide / Q000737:chemistry*; D024502:alpha-Tocopherol / Q000737:chemistry*
chemical_list: D000975:Antioxidants; D011108:Polymers; D011145:Polyvinyls; C016438:ethylenevinylacetate copolymer; D000431:Ethanol; D012822:Silicon Dioxide; D020959:Polyethylene; D024502:alpha-Tocopherol