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投稿时间：2014-11-13
投稿时间：2014-11-13
中文摘要: 建立甜菊糖中 18 种邻苯二甲酸酯的气相色谱质谱（GC-MS）检测方法。甜菊糖样品加水溶解后经正己烷提取， 采用 GC-MS 测定，外标法定量，线性良好，相关系数大于 0.995，16 种邻苯二甲酸酯的线性范围为 0.02 mg/L～2.0 mg/L 定 量限为 0.05 mg/kg，2 种线性范围为 0.2 mg/L～20 mg/L，定量限为 0.5 mg/kg，样品加标回收率为 76.2 %～116.9 %，相对标准 偏差为 4.2 %～14.3 %，该方法简单、快速、稳定。对 102 个甜菊糖样品进行检测，检出率为 23.5 %，邻苯二甲酸二丁酯（DBP）、邻苯二甲酸二（2-乙基）己酯（DEHP）存在超标的情况。
Abstract:A method was developed for the determination of 18 phthalate acid esters in stevioside by Gas chro－ matography-mass spectrometry（GC-MS）. The residues in stevioside were extracted by hexane after dissolved in water，and then analyzed by using GC-MS with external standard method. The calibration curve showed a good linearity with the correlation coefficient r2＞0.995. The linear range of 16 phthalate acid esters were between 0.02 mg/L and 2.0 mg/L， the quantification（LOQ） limits were 0.05 mg/kg. The linear range of 2 phthalate acid esters were between 0.2 mg/L and 20.0 mg/L， the quantification （LOQ） limits were 0.5 mg/kg. The recoveries were ranged from 76.2 % to 116.9 % with the relative standard deviation（RSDs） of 4.2 %-14.3 % in stevioside. The method was effective and stable. Using the method to detect phthalate acid esters in 102 stevioside sample， the positive rate was 23.5 %， and the contents of dibutyl phthalate， diethylhexyl phthalate were above the limi－ tation.
文章编号：201606035 中图分类号： 文献标志码：A
基金项目:国家质检总局课题项目（项目编号：2013IK166）
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