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将纳米纤维固相萃取技术与气相色谱-火焰离子化检测器相结合,建立了同时检测油脂类食品中4种邻苯二甲酸酯(邻苯二甲酸二丁酯(DBP)、邻苯二甲酸丁基苄酯(BBP)、邻苯二甲酸-(2-乙基己)酯(DEHP)、邻苯二甲酸二正辛酯(DNOP))的新方法.为了获得最佳提取效率,对提取条件包括提取溶剂、吸附剂形貌、离子强度和p H进行了优化.在最佳提取条件下,DBP,BBP,DEHP和DNOP的检出限分别为50,25,50,25 ng/g,线性范围为50~4 000 ng/g.将该方法应用于多种食用油样品的检测,只需5 mg PS纳米纤维,即可实现油脂类食品中PAEs的高效萃取,回收率为96.7%~102.3%,相对标准偏差(RSD)小于5%.该方法减少了有机溶剂的使用量和样品前处理过程中复杂繁琐的程序,灵敏度高,重现性好.
Combining the technology of nanofiber solid-phase extraction with gas chromatography-flame ionization detector, the simultaneous determination of four kinds of phthalates (dibutyl phthalate (DBP), o- (BBP), (2-ethylhexyl) phthalate (DEHP), and di-n-octyl phthalate (DNOP) .For the best extraction efficiency, The extraction conditions including extraction solvent, morphology of adsorbent, ionic strength and p H were optimized.Under the optimal extraction conditions, the detection limits of DBP, BBP, DEHP and DNOP were 50, 25, 50, 25 ng / g , Linear range of 50 ~ 4 000 ng / g.This method is applied to the detection of a variety of edible oil samples, just 5 mg PS nanofibers, PAEs can be achieved efficient extraction of oil-based foods, the recovery was 96.7% ~ 102.3%, and the relative standard deviation (RSD) is less than 5%. This method reduces the amount of organic solvents used and the complex and cumbersome procedures in sample preparation. It has high sensitivity and reproducibility.