Heirlings L, Siró I, Devlieghere F, Van Bavel E, Cool P, De Meulenaer B, Vansant E F, Debevere J
Ghent University, Department of Food Technology and Nutrition, Coupure Links, 6539000 Ghent, Belgium.
Food Addit Contam. 2004 Nov;21(11):1125-36. doi: 10.1080/02652030400010439.
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.
在本研究中，研究了具有不同极性的聚合物材料，即低密度聚乙烯（LDPE）和乙烯-醋酸乙烯共聚物（EVA），对α-生育酚从活性包装中迁移行为的影响。抗氧化剂还被吸附到二氧化硅材料上，即SBA-15（圣巴巴拉-15）和Syloblock，以便在挤出过程中保护抗氧化剂，并确保在食品保质期内实现可控且充分的释放。迁移实验在7.0±0.5℃下进行，使用95%乙醇作为高脂肪食品模拟物。所有薄膜都含有高浓度的α-生育酚，约2000mg kg⁻¹，以获得活性包装。聚合物基质对迁移曲线影响较小。使用LDPE而非EVA时，抗氧化剂总迁移量的80%的迁移延迟了2.4天。当α-生育酚吸附到两种二氧化硅材料上时，与纯α-生育酚相比，抗氧化剂总迁移量的80%的迁移延迟了3.4天。吸附到两种二氧化硅材料上的α-生育酚的迁移曲线之间没有差异。对于纯α-生育酚，薄膜中α-生育酚初始量的82%以相当快的迁移速率迁移到食品模拟物中。在吸附到二氧化硅材料的情况下，观察到了完全迁移。这些抗氧化薄膜可在食品应用中发挥积极作用。
