New Approach to Multiresidue Pesticide Determination in Foods with High Fat Content Using Disposable Pipette Extraction (DPX) and Gas Chromatography−Mass spectrometry (GC-MS)

详细信息    查看全文

• 作者：Hongxia Guan ; William E. Brewer ; Stephen L. Morgan
• 刊名：Journal of Agricultural and Food Chemistry
• 出版年：2009
• 出版时间：November 25, 2009
• 年：2009
• 卷：57
• 期：22
• 页码：10531-10538
• 全文大小：870K
• 年卷期：v.57,no.22(November 25, 2009)
• ISSN：1520-5118

文摘

Organochlorine and organophosphate pesticides in corn muffin mix and cocoa beans were analyzed using disposable pipette extraction (DPX) for rapid cleanup followed by gas chromatography−mass spectrometry (GC-MS). The DPX method in this study used weak anion exchange (WAX) mechanisms to remove the major sample matrix interferences, fatty acids, from the chromatographic analyses. The limits of detection (LOD) were determined to be <10 ppb for all studied pesticides in corn muffin. DPX-WAX exhibited average recoveries reaching 100% for most targeted pesticides, with relative standard deviations below 10%. These results indicate that DPX with weak anion exchange sorbent is effective at eliminating fatty acid interferences in foods of high fat content prior to multiresidue pesticide analysis. Furthermore, the DPX cleanup method takes approximately 2 min to perform. In addition, removal of fatty acids from cocoa beans demonstrates the high capacity of this extraction method for samples containing up to 50% fat.