三片食品罐外壁涂膜中有害物质向内涂的迁移

对制版印刷后的食品用三片金属罐外壁涂料中三聚氰胺、苯、甲苯3种有害物质在堆码过程中从外壁涂膜向内涂膜的迁移扩散进行研究。采用高效液相色谱法检测3种常用金属罐(番茄酱罐、八宝粥罐、凉茶罐)内壁和外壁涂膜中三聚氰胺、苯和甲苯3种残留物在去离子水、3g/100mL乙酸、体积分数10%乙醇3种水性食品模拟液中的初始迁移量。并对制罐铁片在恒温(30℃)、恒湿(60±2)% RH、恒压34kPa条件下堆码2个月后内壁涂膜中3种残留物的向食品模拟液中的迁移量与堆码前进行比较分析，即外壁涂膜中这3种残留物向内壁的迁移扩散情况。结果表明，3种有害物质均有从外壁向内壁迁移的现象，迁移量达到0.04～1.60μg/mL，对内壁涂膜的安全性造成极大影响，严重影响到罐装食品的安全性。

Migration of Hazardous Substance Residues in the External Coating of Three-Piece Food Cans

The migration of residual hazardous chemical agents including melamine,benzene and toluene from external can coatings to internal coatings during the stacking process was studied in this paper.A high performance liquid chromatography(HPLC) method was used to determine the substances in three different simulated aqueous food systems,including distilled water,3%(m/V) acetic acid solution and 10%(V/V) ethanol solution.The migration was monitored in the cans stacked at constant temperature(30 ℃),moisture((60 ± 2)% RH) and pressure(3.4 kPa) for two months.It was found that all the harmful substances in the exterior coatings were migrated into the internal wall of the food cans in the migration range of 0.04-1.60 μg/mL,which had a great impact on the safety of inner wall and probably caused further pollution of canned foods.