研究了塑料包装材料对长时间存放的液体食品中不挥发物的迁移规律。采用食品包装常用的5 种塑料薄膜,在常规试验条件下,研究了不同模拟浸泡液中的不挥发物总量与浸泡时间的线性关系,延长浸泡时间至120 d 以及在极限试验条件下的不挥发物迁移量。在3 种浸泡液中的不挥发物总量均随着浸泡时间的增加而增大,在乙酸浸泡液(4%)中的迁移总量最多,最大值为28. 5 mg/ L,在乙醇浸泡液(65%)中的迁移总量最少,最大值为20. 5 mg/ L,A 薄膜在长达120 d 的模拟浸泡液中,不挥发物总量达到了55. 5 mg/ L,极限使用条件下,在正己烷浸泡液中的迁移总量最多,最大值为95. 5 mg/ L。在3 种浸泡液中5 种薄膜均存在迁移行为,危害程度有待评估。

The migration pattern of nonvolatile substance from plastic material to liquid food. Five kinds of plastic films commonly used in food packaging were tested. The linear relationship between total amount of nonvolatile and time were studied in different soaking liquids, under normal test conditions and extending soaking time up to 120 days. The results showed that the total amount of nonvolatile increases along with the increasing of soaking time; the amount of migration is most and the maximum 28. 5 mg/ L in 4% acetic acid; the amount of migration is least and the maximum is 20. 5 mg/ L in 65% ethanol; total amount of nonvolatile of A film in simulated immersion fluid for up to 120 days is 55. 5 mg/ L; the amount of migration is most and the maximum 95. 5 mg/ L in n-Hexane soaking liquid under extreme using conditions. Migration behavior of the five films was found in three soaking liquids, and damage would be assessed in the future.