关键词: 纳米银, 复合包装, 食品模拟物, 塑料添加剂, 迁移, 电感耦合等离子体质谱

Abstract:

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.

Key words: nanosilver, composite packaging, food stimulant, plastic additive, migration, inductively coupled plasma massspectrometry (ICP-MS)