PVC保鲜膜中DEHP和DEHA向猪肉中迁移规律研究

为探究食品级PVC保鲜膜中增塑剂向猪肉中迁移的行为,建立了新鲜猪肉中9种增塑剂同时检测的固相萃取-气相色谱检测方法,并运用建立的方法对市售食品级PVC保鲜膜中增塑剂含量以及其向猪肉中的迁移行为进行分析。结果表明:方法的最低检出限(LOD,S/N=3)为0.020~0.036mg/kg,能够满足分析需要。市售食品级PVC保鲜膜中检测到邻苯二甲酸二(2-乙基己基)酯(di(2-ethylhexyl)phthalate,DEHP)和己二酸二(2-乙基)己酯(di(2-ethylhexyl)adipate,DEHA)两种增塑剂,并以这两种增塑剂为实验对象进行迁移实验。迁移实验中,接触温度、时间、猪肉的脂肪含量对迁移量均有影响:在一定范围内,接触温度越高、时间越长、脂肪含量越高,迁移量越大；对于薄的包装材料,选择与食品接触的那一面进行单侧迁移实验与实际情况更接近。

Migration Behavior of DEHP and DEHA from PVC Wrap to Pork

In order to investigate the migration of plasticizer from PVC wrap to pork, a method for determination of nine plasticizers in pork by gas chromatography coupled with solid-phase extraction was deve-loped. The contents and migration behaviors of plasticizers in PVC wrap were analyzed by using the established method. The results showed that the limits of detection (LOD, S/N=3) for nine kinds of plasticizer were ranged from 0.020 mg/kg to 0.036 mg/kg, which could meet the need of analysis. Di (2-ethylhexyl) phthalate (DEHP) and di (2-ethylhexyl) adipate (DEHA) were detected in PVC wrap obtained from the market. The migrating of DEHP and DEHA from PVC wrap to pork was studied. In the migration experiment, the quantity of migration was influenced by temperature, contact time, and fat contents of pork. In a certain range, the increasing of temperature, contact time, and fat contents led to a larger migration. For thin packaging materials, the result of single-side migration test was closer to the actual situation. The experimental data could predict the safety of plasticizers in food packaging materials and prepackaged foods.