聚丙烯餐盒复用过程中邻苯二甲酸酯类塑化剂和合成酚类抗氧化剂的检测及迁移规律研究

Study on determination and migration rule of phthalate ester plasticizers and synthetic phenolic antioxidants during the reuse of polypropylene lunch boxes

中文关键词:  聚丙烯餐盒  邻苯二甲酸酯  合成酚类抗氧化剂  复用过程迁移规律  气相色谱质谱法

英文关键词:polypropylene lunch boxes  phthalate ester plasticzers  synthetic phenolic antioxidants  migration rule of reuse process  gas chromatography-mass spectrometry

中文摘要:

      目的 建立气相色谱-质谱法(gas chromatography-mass spectrometry, GC-MS)同时测定聚丙烯(polypropylene, PP)餐盒中邻苯二甲酸酯类塑化剂和合成酚类抗氧化剂含量的分析方法, 并研究其在复用过程中向酸性食品模拟物(4%乙酸)、非酸性食品模拟物(10%乙醇、水)以及油脂类食品模拟物(异辛烷、橄榄油)的迁移量。方法 PP餐盒经正己烷超声提取, 食品模拟物根据其不同的性质选择不同萃取液, 液液萃取辅以超声提取, 经SH-Rxi-5MS (30 m×0.25 mm, 0.25 μm)石英毛细管柱分离, 单离子监测(single ion monitoring, SIM)模式扫描, 外标法定量。结果 20种化合物的线性关系在0.01~1.00 mg/L范围内表现良好, 其相关系数均大于0.99, 检出限和定量限分别是0.01~0.02 mg/L和0.03~0.06 mg/L。5种食品模拟物在0.05、0.10和0.50 mg/L 3个水平下加标回收率为80.4%~108.4%, 相对标准偏差为1.3%~10.6% (n=6)。结论 该方法实验过程简便, 灵敏度、精密度、回收率高, 适用于PP餐盒中邻苯二甲酸酯类塑化剂和合成酚类抗氧化剂含量和迁移量的测定。实验结果可知, PP餐盒在热接触和微波加热的复用过程中均有一定程度的迁移, 需要引起重视。

英文摘要:

      Objective To establish a method for the simultaneously determination of the content of phthalate ester plasticizers and synthetic phenolic antioxidants in polypropylene (PP) lunch boxes by gas chromatography-mass spectrometry (GC-MS) method, and study their migration to acidic food simulants (4% acetic acid), non acidic food simulants (10% ethanol, water), and lipid food simulants (isooctane, olive oil) during reuse. Methods The sample of PP lunch boxes ultrasonically extracted by n-hexane, different food simulants according to their different properties choose extraction liquid, liquid-liquid extraction with ultrasonic extraction, compounds separated by SH-Rxi-5MS (30 m×0.25 mm, 0.25 μm) quartz capillary column, was scanned using single ion monitoring (SIM) mode and quantified through an external standard technique. Results The linear relationships of 20 kinds of compounds were good in the range of 0.01–1.00 mg/L, and the correlation coefficients were all greater than 0.99. The limits of detection and limits of quantitative of the method were 0.01–0.02 mg/L and 0.03–0.06 mg/L, the recoveries of 5 kinds of food simulants, at 0.05, 0.10 and 0.50 mg/L, were spiked, ranging from 80.4% to 108.4%, with a relative standard deviation of 1.3% to 10.6% (n=6). Conclusion This method has the advantages of simple experimental process, high sensitivity, precision and recovery, is apt for ascertaining the determination and migration amount of phthalate ester plasticizers and synthetic phenolic antioxidants in PP lunch box. The experimental results show that, PP lunch boxes have a certain degree of migration during the reuse process of thermal contact and microwave heating, which requires attention.