Study of the effect of fatty acids profile on overall migration from PET into different types of oil

Overall migration (OM) of polyethylene terephthalate (PET) pieces into three types of commercial oils, namely sunflower oil, canola oil and blended oil (which included sunflower oil, soybean oil, and cottonseed oil) has been investigated by the determination of the weight variation of plastic pieces before and after 20, 60 days contact with oil at 25, 45 degrees C and also determination the amount of absorbed oil. Also Fatty acid profiles of each type of oil were determined by using a Gas Chromatography (GC) system before and after experiments to find the correlation between the amount of overall migration and fatty acid profile. The result shows that the highest migration level was noticed with PET pieces contacted with blended oil. Also the effect of temperature, storage time, kind of oils and amount of unsaturated fatty acids and degree of unsaturation in amount of migration were observed. The amount of migration has correlation with fatty acid profile, especially the amount of unsaturated fatty acids and also, the degree of unsaturation. The reasons of these subjects can be investigated in future trends. Previous investigations have been performed on food stimulant such as olive oil and synthetic triglyceric mixture HB307, the present study has the advantage of working on real food samples so obtaining more accurate results were possible.