Bott Johannes, Franz Roland
Department of Product Safety and Analytics, Fraunhofer Institute for Process Engineering and Packaging (IVV), 85354 Freising, Germany.
Nanomaterials (Basel). 2018 Sep 13;8(9):723. doi: 10.3390/nano8090723.
In this study, the migration potential of laponite, a small synthetic nanoclay, from nanocomposites into foods was investigated. First, a laponite/ethylene vinyl acetate (EVA) masterbatch was compounded several times and then extruded into thin low-density polyethylene (LDPE) based films. This way, intercalation and partial exfoliation of the smallest type of clay was achieved. Migration of laponite was investigated using Asymmetric Flow Field-Flow Fractionation (AF4) with Multi-Angle Laser Light Scattering (MALLS) detection. A surfactant solution in which laponite dispersion remained stable during migration test conditions was used as alternative food simulant. Sample films with different loadings of laponite were stored for 10 days at 60 °C. No migration of laponite was found at a limit of detection of 22 µg laponite per Kg food. It can be concluded that laponite (representing the worst case for any larger structured type of clay) does not migrate into food once it is incorporated into a polymer matrix.
在本研究中，对一种小型合成纳米粘土——锂皂石从纳米复合材料迁移至食品中的可能性进行了调查。首先，将锂皂石/乙烯-醋酸乙烯酯（EVA）母料多次混合，然后挤出制成基于低密度聚乙烯（LDPE）的薄膜。通过这种方式，实现了最小类型粘土的插层和部分剥离。使用配备多角度激光光散射（MALLS）检测的不对称流场-流分级法（AF4）研究了锂皂石的迁移情况。一种在迁移测试条件下锂皂石分散体保持稳定的表面活性剂溶液被用作替代食品模拟物。将含有不同锂皂石含量的样品薄膜在60℃下储存10天。在每千克食品中锂皂石的检测限为22微克时，未发现锂皂石有迁移现象。可以得出结论，锂皂石（代表任何更大结构类型粘土的最坏情况）一旦被掺入聚合物基质中，就不会迁移到食品中。
