淋膜纸杯中Al、Mg向酸性食品模拟物的迁移及数学模拟

Migration and mathematical simulation of Aluminum and Magnesium from coated paper cup into acid food simulants

为了研究淋膜纸杯中Al和Mg向酸性食品中的迁移规律以及数学模拟软件模拟迁移的有效性,对8种淋膜纸杯样品采用湿法消解的方法消解,之后利用电感耦合等离子体原子发射光谱(ICP-OES)检测8种淋膜纸杯中Al和Mg的初始含量及其向酸性食品模拟物(3%乙酸溶液)中迁移的量。淋膜纸杯中Al和Mg的初始含量分别为841.6～3 482.0,179.1～19 720.1mg/kg。在迁移条件为40℃/12h,8种样品中Al和Mg向3%乙酸溶液中迁移量分别为0.077～0.212,0.065～0.862mg/kg,而在70℃/8h下8种样品中Al和Mg向3%乙酸溶液中迁移量分别为0.074～0.180,0.064～2.209mg/kg,淋膜层低密度聚乙烯(LDPE)的厚度、迁移温度和时间以及纸的厚度和密度都能影响2种金属元素的迁移。使用迁移模拟软件AKTS-SML对8种淋膜纸杯样品进行迁移模拟,扩散系数采用Piringer模型,纸与LDPE之间的分配系数设置为1 000,LDPE与食品模拟物(3%乙酸)之间的分配系数设置为1,Al和Mg在40℃/12h下迁移模拟结果分别为0.760～3.075,0.162～17.750mg/kg;70℃/8h下迁移模拟结果分别为0.757～3.059,0.161～17.660mg/kg,软件模拟的迁移结果比试验所得到的都要高,迁移模拟结果在一定程度上能取代Al和Mg的迁移试验,确保消费者安全。

In order to study the migration of metal elements Al and Mg into acidic foods in coated paper cups and the effectiveness of mathematical simulation software to simulate migration,eight kinds of coated paper cup samples were digested by wet digestion,and then inductively coupled plasma atomic emission spectrometry(ICP-OES)was used to detect the initial contents of aluminum(Al)and magnesium(Mg)in eight kinds of coated paper cups and their migration into acidic food simulants(3% acetic acid solution).The initial contents of Al and Mg in 8 paper cups were 841.6~3 482.0 and179.1~19 720.1 mg/kg,respectively.Under the migration conditions of 40℃/12 h,the migration of metal elements Al and Mg into3% acetic acid solution in the 8 samples was 0.077~0.212 and0.065~0.862 mg/kg,and at 70 ℃/8 h,the migration of metal elements Al and Mg into 3% acetic acid solution was 0.074~0.180 and0.064~2.209 mg/kg,respectively.The thickness of the LDPE layer,the migration temperature and time,and the thickness and density of the paper can also affect the migration of the two metal elements.Using the migration simulation software AKTS-SML,simulation of Al and Mg migration were carried out.Piringer model was used to calculate the diffusion coefficients.The partition coefficient between paper and low density polyethylene(LDPE)was set to1 000,The partition coefficient between LDPE and food simulants(3% acetic acid)was set to 1,the migration of metal elements Al and Mg simulated at 40 ℃/12 h were 0.760~3.075 and 0.162~17.750 mg/kg respectively;the migration simulation results at70℃/8 hwere 0.757~3.059 and 0.161~17.660 mg/kg,the migration results simulated by the software are higher than those obtained by the experiment,migration simulation software can simulate the migration of metal elements Al and Mg to some extent.