快餐包装纸中矿物油向固体食品模拟物的迁移

Migration of Mineral Oil Hydrocarbons from Fast Food Wrapping Paper into Solid Food Simulants

研究从市场上收集到的24种快餐包装纸中的矿物油向固体食品模拟物Tenax的迁移规律。在多个不同的迁移条件(40℃/0.5、1、2、3 h,40℃/10 d和70℃/2 h),探究矿物油的迁移行为及其影响因素,以评价其安全性。选择正己烷-乙醇(1∶1,V/V)混合溶液对Tenax进行过夜萃取,采用质量分数0.3%硝酸银固相萃取柱对饱和烃矿物油(mineral oil saturated hydrocarbons,MOSH)和芳香烃矿物油(mineral oil aromatic hydrocarbons,MOAH)进行分离纯化,最后用气相色谱-氢火焰离子化检测法和气相色谱-质谱法分别进行定量和定性分析。结果表明:随着温度的升高,多种快餐包装纸中矿物油向Tenax的迁移量也随之增加。涂蜡纸中MOSH迁移量均有所检出,其数值为110.49~615.40 mg/kg,而MOAH部分均未检出,这可能是因为涂蜡纸表面涂覆的石蜡层属于MOSH类,导致其MOSH部分的迁移量较高。网购餐盘纸和常规餐盘纸中MOSH迁移量约为其特定限量值(0.6 mg/kg)的10~400倍,MOAH的迁移量约为其特定限量值(0.5 mg/kg)的10~70倍,而使用优质胶印油墨的原生纤维餐盘纸均未超过其限量值。最后,通过对印有胶印油墨的原生纤维餐盘纸中矿物油进行溯源分析,发现经过迁移的矿物油一部分可能来源于其所用油墨,其他来源可能来自于回收纤维、黏合剂、添加剂和加工助剂等。

The migration behavior of mineral oil hydrocarbons from 24 kinds of fast food wrapping paper into the solid food simulant Tenax was explored under various conditions(40℃/0.5,1,2 and 3 h;40℃/10 d;and 70℃/2 h),and the factors affecting it were evaluated to evaluate their safety.An n-hexane-ethanol(1:1,V/V)mixed solution was used to extract the mineral oil hydrocarbons in Tenax overnight.Then,the mixed solution was separated and fractionated on silver nitrate solidphase with mass ratio in 0.3%extraction column into mineral oil saturated hydrocarbons(MOSH)and mineral oil aromatic hydrocarbons(MOAH),which were quantified and qualified by gas chromatography-flame ionization detection(GC-FID)and gas chromatography-mass spectrometry,respectively.The results showed that the amount of migrated mineral oil hydrocarbons increased as temperature increased.The migration of MOSH from the waxed paper samples was detected at levels of 110.49-615.40 mg/kg,while the migration of MOAH was not detected in any of the samples,indicating that the paraffin layer coated on the waxed paper surface contained MOSH but not MOAH.The migration amounts of MOSH and MOAH from online-purchased traymates and common traymates were approximately 10-400 and 10-70 times higher than the specific limit values(0.6 and 0.5 mg/kg),respectively.However,the migration amounts from traymates with virgin fiber with high-quality printing ink did not exceed the limits.Finally,through source analysis of mineral oil in virgin fiber plate paper with printing ink,it was found that part of the migrated mineral oil may come from the ink.Other sources may include recycled fibers,binders,additives and processing aids.