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SPE Tubes Make Sample Extraction and Cleanup EasyCategory: Sample PrepThe new QuEChERS (catchers) methods for sample extraction and cleanup are based on work published by the US Department of Agriculture Eastern Regional Research Center. Researchers there developed a simple, effective and inexpensive way to extract and clean pesticide residues from the diverse sample matrices associated with food products. QuEChERS products further simplify this technique and allow labs to realize four-fold increases in sample throughput while reducing material costs. The researchers developed a simple two-step procedure involving solvent extraction and partitioning, followed by a dispersive SPE technique. Multiple adsorbents are placed in a centrifuge tube, along with organic solvent and the extracted residues. Using the dispersive SPE approach, the quantity and type of adsorbents, as well as the pH and polarity of the solvent, can be easily adjusted for differing matrix interferences and difficult analytes. Results from this approach have been verified and modified at several USDA and Food and Drug Administration labs, and the method is now widely accepted for many types of pesticide residue samples. QuEChERS tubes make using this new economical technique even easier. The centrifuge tube format, available in several sizes, contains magnesium sulfate (to partition water from organic solvent) and PSA adsorbent (to remove sugars and fatty acids), with or without graphitized carbon (to remove pigments and sterols) or C18 packing (to remove non-polar interferences). A variety of QuEChERS products are available, including products compliant with AOAC, multi-miniresidue and draft European methods.
Restek Corporation*
110 Benner Circle
Bellefonte PA 16823
Phone: 814-353-1300
Fax: 814-353-1309
http://www.restek.com
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