Migration regularity of toxic and harmful substances in food packaging materials

Migration refers to chemicals in food packaging materials to contact with the food inside surface diffusion and solvation or dissolved. Migration is a process of diffusion and balance. Moving objects in the polymer film diffusion migration can be divided into three interconnected stages: permeate quality spread in the polymer dissolves, seepage at the interface between polymer and food quality, penetrating into food. Food packaging material migration test was used for evaluating packaging material to the flow of the content of toxic and harmful substances in food. Migration amount except is determined by the nature of the migration of material and dosage, also related to the contact material and environmental conditions. Migration of poisonous and harmful material mainly by food simulation content, the influence of factors such as migration time and temperature. Due to the complicated composition of the food itself, some of the material composition of pollutants migration quantity will have the effect of trace, so you need to choose simple, reasonable food simulation experiment for migration. According to the European Union standards, according to the different food itself characteristic, can choose distilled water, 3% of acetic acid, 15% ethanol and distillation simulation objects of olive oil as a food. Lily wang etc. The research results show that the phthalic acid ester compounds in high temperature, high oil content of food is relatively low temperature, low oil content of food pollution degree is bigger. Zhi-bin yu, etc. Research has shown that, under the environment of oily, food packaging material migration objects relative quantity biggest migration; In the acid and the environment, food packaging material migration migration relative amounts were less. Time and temperature are the important factors that affect migration of chemical substances, confirmed by the short-term high temperature low temperature when soaking and long soak effect is the same. Contact, but at the same time, the migration amount increases with temperature rise. At the same temperature conditions, the total amount of migration increased with the extension of time, and the higher the temperature, the more obvious increase trend. Under the condition of low temperature, even if contact for a long time, the migration of the change is very small. In addition, microwave heating, high pressure treatment, etc, will be accelerated migration velocity of harmful substances.
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