Interaction of Packaging Materials and Vegetable Oils: Global Migration and Oil Absorption

摘要

Global migration of different types of plastic food packaging materials including (Polyethyleneterephthalate (PET), Polyvinylchloride (PVC), Polypropylene (PP) and Polystyrene (PS) into different type of vegetable oils (olive, sunflower and palm oils) has been determined after 20 and 60 days of storage at 24 and 37?C. The global migration was calculated by determination the weight of plastic strips before and after contact with oil and the amount of absorbed oil. The absorbed oil was determined by Gas Chromatographic (GC) analysis. The rate of migration and final yield were temperature dependent. The major fatty acids in each type of oil at the equilibrium were used to calculate this amount of bsorbed oil. In general overall migration (global migration) from plastics was found to be lower in PET and PVC compared to PS and PP. When comparing the absorption of different oils into plastics, the ranking was PS> PP >PVC> PET. The type of oil was found not only influence the global migration but also the amount of the absorbed oil. Global migration was found to be slightly higher into oil contained high amount of short- chain and unsaturated fatty acids. The results are also discussed the effect of temperature and storage time on the migration level and oil absorption.