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Automated micro-SPE Clean-up of QuEChERS Extracts for Multi-Residue Pesticide Analysis
Automated micro-SPE Clean-up of QuEChERS Extracts for Multi-Residue Pesticide Analysis
Submitted on 11 Jan 2017

Guenter Boehm1, Reto Bolliger1, Hans-Joachim Hübschmann2, Bruce D. Morris3, Richard B. Schriner3
1CTC Analytics AG, Zwingen, Switzerland; 2CTC Analytics AG, Osaka, Japan; 3Hill Laboratories, Hamilton East, New Zealand
This poster was presented at EPRW 2016
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Poster Abstract
The extraction and clean-up of pesticides from food still poses challenges due to the high number and difference in chemical nature of the compounds embedded in food matrices of high complexity and highly varying compositions. Due to their differences in polarity compounds are analysed by GC or LC separation typically using MS/MS or accurate mass instrumentation.
In recent years the QuEChERS (Quick Easy Cheap Effective Rugged Safe) methodology [1] has been introduced in many food safety laboratories for pesticides. While the extraction step has been well standardised (AOAC 2007.1; CEN 15662) the clean-up of the resulting extracts still differs widely for different matrices and laboratories. The potential for high sample throughput using the QuEChERS extraction is impeded by laborious manual sample preparation. Analytical limitations come from the dispersive SPE (dSPE) step used in the QuEChERS methodology with high matrix load and reduced recoveries for low polar pesticides from lipid matrix foods. In consequence several matrix dependent clean-up strategies are found in the literature to overcome matrix effects.
An automated procedure for the clean-up of QuEChERS extracts as well as typical results obtained with it are presented. With the versatile methodology an almost matrix independent, robust and efficient clean-up solution for extracts can be realized [2,3].

[1] Anastassiades M, Lehotay SJ, Stajnbaher D, Schenck FJ; J. AOAC Int. 2003, 86, 412−31. [2] Morris BD, Schriner RB; J. Agric. Food Chem. 2015, 63, 5107-19. [3] Lehotay SJ, Han L, Sapozhnikova Y; Chromatographia 2016, 79, 1113-30Report abuse »
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