纳米铜/聚丙烯复合膜中铜向食品模拟物的迁移及其对膜性能的影响

Migration of copper from nano-copper/polypropylene composite films and its effects on the properties of films

当纳米包装材料与食品接触时,纳米成分可能会迁移到食品中,由于对纳米成分的毒性研究还不充分,可能引发食品安全问题。通过电感耦合等离子体发射光谱仪(inductively coupled plasma optical emission spectrometer, ICP-OES)探究了时间、温度、纳米铜含量、偶联剂、伽马射线辐照、循环使用及乙酸食品模拟物浓度对纳米铜/聚丙烯复合膜中铜向模拟物中迁移的影响,并对比复合膜迁移前后性能的变化。结果表明:复合膜中铜向模拟物中迁移的迁移率随时间和温度的增加而增大,直至平衡;循环使用的复合膜中铜在每次循环时的迁移能力与纳米铜含量有关;伽马射线辐照、乙酸食品模拟物的浓度增大使铜的迁移量显著增大;迁移后复合膜的机械性能较稳定,微观形貌和粗糙度随迁移行为有所变化。

When nano-packaging materials come into contact with foods, nano-components may migrate into foods. As toxicity studies on nano-components are insufficient, migration of nano-components may cause food safety problems. The effects of time, temperature, nano-copper content, coupling agent, gamma ray irradiation treatment, repeated use and the concentration of acetic acid simulated foods on the release of copper from nano-copper/polypropylene composite films were studied by using inductively coupled plasma optical emission spectrometer (ICP-OES). The mechanical properties and morphology of the composite films before and after migration tests were also explored. The results indicated that the migration rate of copper from composite films increased with time and temperature until a balance was reached. When the films contacted with simulated foods repeatedly, the amount of copper migrated at each cycle was related to the nano-copper content. Increased gamma ray irradiation and the concentration of acetic acid simulated foods enhanced the amount of copper migrated significantly. The mechanical properties of the films after migration tests were relatively stable. The micro morphology and roughness of the films were changed after copper migration.