食品包装纸中紫外吸收剂向固态模拟物的迁移行为

摘要

研究4种紫外吸收剂,即2-(2'-羟基-3',5'-二叔丁基苯基)-5-氯代苯并三唑(UV-327)、2-(2-羟基-5-甲基苯基)苯并三氮唑(UV-P)、2-羟基-4-甲氧基二苯甲酮(UV-9)和2-羟基-4-正辛氧基二苯甲酮(UV-531)在50、75℃和100℃3个温度条件下从食品包装牛皮纸迁移到固态食品模拟物Tenax(R)中的迁移规律和影响因素.结果表明:随着温度的升高,紫外吸收剂的迁移速度加快,迁移量增加.此外,不同紫外吸收剂本身的物理化学性质(相对分子质量、油水分配系数等)也对其迁移规律和平衡迁移率产生了重要影响.在上述实验的基础上建立数学模型,以达到预测迁移量的目的.数据证明,所构建的模型可很好地预测在达到迁移平衡前,紫外吸收剂从牛皮纸迁移到Tenax(R)中的迁移量.%Migration of contaminants from packaging materials into food is a big issue in food safety and quality,as it may pose a threat for consumers.With that in mind,it is necessary to study migration characteristics and mathematic modeling to predict the amount of migration.In this study,the migration of four kinds of ultraviolet absorbers (UV-327,UV-P,UV-9 and UV-531) from kraft paper to solid food simulants was investigated at 50,75 and 100 ℃.Effects of temperature and physicochemical properties of the ultraviolet absorbers on migration were examined.Temperature played a key role in the migration process.The migration rate and final migration amount increased with temperature.Smaller molecular weight,lower values of lgPo/w and boiling points of migrants had a positive impact on the migration.The mathematic model based on Fick's second law was built and applied to predict the migration amount of UV-P from paper into solid simulants at 70 ℃.The results showed that the built mathematic model could predict the migration amount very well in the initial period before equilibrium.