该研究采用液液萃取结合气相色谱-质谱（GC-MS）法建立了白酒接触用塑料材料中2,2,4-三甲基-1,3-戊二醇双异丁酸酯（TXIB）迁移量的测定方法。方法采用食品模拟物对常见塑料材料样品进行迁移试验后，得到模拟浸泡液，选择正己烷作为萃取溶剂对模拟浸泡液进行萃取，萃取溶剂体积为2 mL，震荡萃取时间为1 min，萃取液用HP-5ms（30 m×0.25 mm×0.25 µm）毛细管色谱柱进行分离，采用GC-MS选择离子模式（SIM）进行分析，外标法定量。该方法可快速定量分析白酒接触用塑料材料中TXIB迁移量，线性关系良好（r=0.9975），定量限为0.02 mg/kg，加标回收率为106.60%~119.90%，相对标准偏差为2.30%~6.50%。该方法快速、灵敏、准确，适用于白酒接触用塑料材料中TXIB迁移量的检测。

Liquid-liquid extraction and gas chromatography-mass spectrometry (GC-MS) was used to establish a quantitative method for measuring the leaching of 2,2,4-trimethyl-1,3-pentanediol diisobutyrate (TXIB) in plastics in contact with Chinese Baijiu. Food simulants were used to prepare a simulated soaking solution for measuring the leaching of common plastic materials. N-Hexane was used as an extraction solvent. The volume of extraction solvent was 2 mL, and the shaking extraction time was 1 min. The extract was separated by HP-5 ms (30 m×0.25 mm×0.25 μm) capillary chromatography, analyzed by GC-MS with selective ion monitoring, and quantified using an external standard. The results show that this method can be used to rapidly measure the quantity of TXIB leached from plastic materials into Baijiu, which is reflected by the regression line correlation coefficient (r=0.9975), limit of quantification (0.02 mg/kg), recovery (106.60%~119.90%), and relative standard deviations (2.30%~6.50%). This method is rapid, sensitive, and accurate, and is suitable for evaluating TXIB leaching from plastics in contact with Baijiu.

贵州茅台酒股份有限公司自建项目（2016010）