加热方式对聚碳酸酯中双酚A迁移规律影响

Effect of heating methods on Migration of bisphenol A from polycarbonate

结合聚碳酸酯(PC)塑料的实际使用情况,以蒸馏水、自来水和矿泉水为食品模拟物,采用高效液相-荧光检测法测定PC塑料中双酚A在微波加热和恒温加热时向不同水质中的迁移量。结果表明:微波加热和恒温加热条件下,迁移率均随加热时间的延长而增加,其中蒸馏水中迁移率最低。微波加热比常规恒温加热达到平衡的时间缩短近12倍,说明微波加热能加速塑料中有害物质的迁移速率;蒸馏水和自来水在2种加热方式下的最大迁移率并无差别(P>0.05),矿泉水在微波加热时最大迁移率要高于恒温加热(P<0.01),因此,使用微波加热食品时,应注意容器所盛装食品的性质和控制加热的时间,以免引起PC容器中双酚A向食品的迁移。

The migration rates of bisphenol A from PC in the distilled water,tap water and mineral water were determined under microwave heating and constant temperature heating by high performance liquid chromatograph fluorescence detector The results showed that the migration rates of bisphenol A increased with the increasing of heating time under both heating methods. Among three different types of water,the migration rate of bisphenol A in the distilled water was the lowest. The equilibrium time of the migration by the microwave heating was nearly 12 times shorter than that by constant temperature heating. This indicated that the migration rates of harmful substances in the plastic were accelerated under the microwave heating process. As a result,the migration test time was saved and the cost was reduced. There was no obvious difference in maximum migration rates of bisphenol A in the distilled water and tap water between two heating methods（ P 0. 05）. The maximum migration rate of bisphenol A in the mineral water by the microwave heating was higher than that by the constant temperature heating（ P 0. 01）. Therefore,when the food was heated by the microwave heating,the heating time should be paid more attention due the food properties in order to minimize the migration of bisphenol A from PC to the food.