纳米银-聚乙烯复合包装中助剂对银向食品模拟物迁移的影响

为探究纳米银-聚乙烯复合包装中添加剂对纳米银颗粒向食品模拟物迁移的影响，在20、40 ℃和70 ℃条件下分别将空白纳米银聚乙烯复合包装和含有助剂（抗氧化剂1076、抗氧化剂168、光稳定剂622和光稳定剂944）的纳米银聚乙烯复合包装在3 g/100 mL乙酸溶液和体积分数50%乙醇溶液两种食品模拟物中浸泡1～30 h，然后蒸干定容并用电感耦合等离子体质谱测定银的含量。结果表明：食品模拟物中银的加标回收率在84.19%～115.69%之间，相对标准偏差在3.21%～8.75%之间；在8 h内塑料中的添加剂会促进银向两种食品模拟物的迁移；同时银的迁移率会随着迁移温度的升高和迁移时间的增加而增大直至平衡；平衡时，塑料中的添加剂反而阻碍银向这两种食品模拟物的迁移；银在酸性模拟物中的迁移率大于在酒精类模拟物中的迁移率。

Impact of Additives on Migration of Silver from Nanosilver-Plastic Food Packaging to Food Simulants

This study aimed to explore the effects of additives in nanosilver packaging on the migration of silver (Ag) intofood simulants. Two nanosilver films, blank nanosilver-polyethylene film and nanosilver-polyethylene film containingadditives, which were Irganox 1076, Irganox 168, light stabilizer 622 and light stabilizer 944, were soaked in the foodsimulants 3 g/100 mL aqueous acetic acid (m/V) or 50% aqueous ethanol (V/V) at 20, 40 or 70 ℃ for 1–30 h, and digestedwith electric heating digestion. Then the initial content of silver in films and the amount of the migrated silver weredetermined by inductively coupled plasma mass spectrometry (ICP-MS). The spike recoveries of Ag from food simulantranged from 84.19% to 115.69% with relative standard deviation (RSD) between 3.21% and 8.75%. The results indicatedthat from the start to 8 hours, the amount of Ag migrated into two food simulants was promoted by the presence of additivesin the films. In addition, silver content was increased gradually with increasing the migration temperature and time in bothfood simulants. At the migration balance, additives hindered silver movement. The amount of Ag migrated in aqueous aceticacid was higher than that in aqueous ethanol.