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首页> 美国卫生研究院文献>Toxics >Magnetic Stirring Assisted Demulsification Dispersive Liquid–Liquid Microextraction for Preconcentration of Polycyclic Aromatic Hydrocarbons in Grilled Pork Samples
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Magnetic Stirring Assisted Demulsification Dispersive Liquid–Liquid Microextraction for Preconcentration of Polycyclic Aromatic Hydrocarbons in Grilled Pork Samples

机译：电磁搅拌辅助破乳分散液-液微萃取对猪肉样品中多环芳烃的预浓缩

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摘要

A simple microextraction method, magnetic stirring assisted demulsification dispersive liquid–liquid microextraction, for preconcentration of five polycyclic aromatic hydrocarbons (fluorene, phenanthrene, anthracene, fluoranthrene, and pyrene) was investigated prior to analysis by high performance liquid chromatography. In this method, a mixture of extraction solvent and disperser solvent was rapidly injected into sample solution. The magnetic stirrer agitator aided the dispersion of the extraction solvent into the sample solution. After the formation of an emulsion, the demulsifier was added, resulting in the rapid separation of the mixture into two phases. No centrifugation step was required. Several parameters affecting the extraction efficiency of the proposed method were studied, including addition of salt, kind and volume of extraction solvent, volume of demulsifier solvent, and extraction times. Under the optimum conditions, high enrichment factor, low limit of detections (LODs) and good precision were gained. The proposed method was successfully applied to analysis of polycyclic aromatic hydrocarbon residues in grilled pork samples.
机译：在通过高效液相色谱分析之前，研究了一种简单的微萃取方法，即磁力搅拌辅助破乳分散液-液微萃取，用于预浓缩五种多环芳烃（芴，菲，蒽，芴和pyr）。在这种方法中，将萃取溶剂和分散剂的混合物快速注入样品溶液中。磁力搅拌器有助于将萃取溶剂分散到样品溶液中。形成乳液后，加入破乳剂，从而将混合物快速分离成两相。不需要离心步骤。研究了影响该方法萃取效率的几个参数，包括盐的添加，萃取溶剂的种类和体积，破乳剂的体积以及萃取时间。在最佳条件下，获得了高富集因子，低检测限（LOD）和良好的精密度。所提出的方法已成功应用于烤猪肉样品中多环芳烃残留的分析。

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