Garde J A, Catalá R, Gavara R, Hernandez R J
School of Packaging, Michigan State University, East Lansing 48824-1223, USA.
Food Addit Contam. 2001 Aug;18(8):750-62. doi: 10.1080/02652030116713.
The migration (diffusion and equilibrium) processes of antioxidants (AOs) from polypropylene (PP) films of different thicknesses into n-heptane and 95% ethanol as fatty food simulants were analysed at 20, 37 and 60 degrees C. Heptane fully extracted the AOs from the polymer while a partition equilibrium described the migration to ethanol. The kinetics of migration were also studied via the diffusion coeffcients. As expected, diffusion was found to be faster when the polymer was in contact with heptane, due to polymer swelling by the solvent. The kinetics of the process in ethanol was described by different theoretical expressions which are discussed. Equations disregarding partition equilibrium failed to describe the process and the diffusion coefficient values obtained through them were much smaller than the actual ones and dependent on film thickness. The results also showed the significance of food simulant selection in the analysis of food-packaging interactions and migration variability with thickness.
在20、37和60摄氏度下，分析了不同厚度聚丙烯（PP）薄膜中的抗氧化剂（AO）向作为脂肪类食品模拟物的正庚烷和95%乙醇中的迁移（扩散和平衡）过程。正庚烷能完全从聚合物中萃取出抗氧化剂，而向乙醇中的迁移则呈现分配平衡。还通过扩散系数研究了迁移动力学。正如预期的那样，由于溶剂使聚合物溶胀，当聚合物与正庚烷接触时，扩散更快。乙醇中该过程的动力学由不同的理论表达式描述并进行了讨论。忽略分配平衡的方程无法描述该过程，通过这些方程获得的扩散系数值远小于实际值，且依赖于薄膜厚度。结果还表明了在分析食品包装相互作用以及迁移随厚度的变化时，食品模拟物选择的重要性。
