返青箬叶中铜向不同食品迁移的模拟研究

Simulation on the Migration of Copper from Regreened Indocalamus Leaves to Different Food

目的测定返青箬叶中铜在不同食品模拟物中的迁移量,评估其食品安全风险。方法将返青箬叶置于不同食品模拟物中,在100℃下保温24 h,使其中的铜向食品模拟物充分迁移,用微波消解−原子吸收光谱法测定返青箬叶在迁移模拟试验前后铜的含量,并计算迁移量,以分析迁移规律。结果返青箬叶中的铜在50 g/L碳酸氢钠溶液中未发生迁移,在其他5种食品模拟物中发生了不同程度的迁移,在大豆油中的迁移量最大。当五水硫酸铜浸泡液的质量浓度为5 g/L时,所制备的冷冻返青箬叶和冷鲜返青箬叶中的铜含量分别为1119.2、548.2 mg/kg,向大豆油中的迁移量分别为6.1、2.8 mg/L。返青箬叶中的铜含量越高,铜向食品模拟物中迁移的量越大。结论除碱性食品外,将返青箬叶用作食品内包装材料存在一定的食品安全风险,冷冻返青箬叶的风险远高于冷鲜返青箬叶。

The work aims to measure the migration of copper from regreened indocalamus leaves to different food simulants,and evaluate the food safety risks.Regreened indocalamus leaves were placed in different food simulants and kept at 100℃for 24 hours so that the copper in the leaves could migrate to the food simulants fully.The content of copper in regreened indocalamus leaves was measured by microwave digestion-Flame Atomic Absorption Spectrometry(AAS)to evaluate the migration of copper from regreened indocalamus leaves to food simulants before and after the simulation migration test.Finally,the migration amount was calculated,and the migration regularities of copper were analyzed.The copper in regreened indocalamus leaves did not migrate in 50 g/L sodium bicarbonate solution but migrated in other 5 food simulants varying in degrees.The largest amount of copper migration was measured in soybean oil.When the mass concentration of copper sulfate pentahydrate solution was 5 g/L,the copper contents of the prepared frozen and cold fresh regreened indocalamus leaves were 1119.2 mg/kg and 548.2 mg/kg respectively,and the migration amount of copper from the leaves to soybean oil was 6.1 mg/L and 2.8 mg/L respectively.The copper in regreened indocalamus leaves does not migrate in alkaline food,but it migrates in other five kinds of food varying in degrees,and the migration amount is the largest in soybean oil.The higher the copper content in regreen indocalamus leaves,the greater the amount of copper migration to food simulants.The use of regreened indocalamus leaves as food packaging materials has great food safety risks,and the risk of frozen regreened indocalamus leaves is much higher than that of cold fresh ones.