June 4 - 6, 2012
Crowne Plaza Hotel
St. Louis, MO
Abstracts
Pesticides, Session Chair: Chris Sack

  • Don Shelly, UCT LLC., Bristol, PA, USA

    C18 Sorbents and QuEChERS Clean-Up
    Are Variations in Pesticide Recoveries Manufacturer Dependent?

    A recent study in the literature indicated that recoveries of pesticides Phorate, Diazinon, Chlorpyrifos, and Methidathion decrease as amounts of C18 are increased in
    dispersive solid-phase extraction (d-SPE) clean-up. The C18 used in this study was from one source.  The reduced recoveries were attributed to the lipophilic pesticides
    being bound to lipids which were removed by the C18. A portion of this study was repeated in our laboratory using various amounts of C18 sorbents from five different
    manufacturers.  The purpose was to determine how differences in sorbent manufacturing can affect analyte recovery. Based on this data, the analytical chemist needs to
    carefully evaluate the C18 used in their QuEChERS clean-up to avoid irreproducible results.
    _________________________________________________________________________________________________________________________________________
    Don Shelly, Food and Environmental Technical Service, UCT LLC., 2731 Bartram Road, Bristol PA, 19007, USA, Phone 717-247-0896, Email: dshelly@unitedchem.com

  • Richard Thompson, U.S. Food and Drug Administration, Office of Regulatory Affairs, Arkansas Regional Laboratory, Jefferson, AR, USA

    A Routine Day of Pesticide Analysis at FDA's Arkansas Regional Laboratory

    The analysis of pesticides in foods at the FDA has evolved rapidly in the last few years with major shifts from gas chromatographs with element specific detectors to
    GC/MS and LC-MS/MS, and from using many involved extraction schemes to a few simplified and rapid methods. The Arkansas Regional Laboratory is one of six FDA
    laboratories involved with the analysis of foods and feeds for pesticides and industrial chemicals and it’s operation is typical of the other FDA field laboratories . This
    overview shows the challenges the FDA faces in fulfilling it’s mission to protect the American public and the techniques we are employing to meet those challenges.
    _________________________________________________________________________________________________________________________________________
    Richard Thompson, U.S. Food and Drug Administration, Office of Regulatory Affairs, Arkansas Regional Laboratory, Jefferson, AR, USA

  • Don Shelly, Xiaoyan Wang, Craig A Perman, UCT Inc., Bristol, PA, USA

    Modified QuEChERS Procedure for the Analysis of Bisphenol A in Canned Food Products

    Bisphenol A (BPA) monomer is used to prepare polycarbonate and epoxy resins and is often found as a coating on the interior of canned food products. Unreacted BPA
    leaches into food products and is ingested by consumption of these canned foods. This paper describes a simple and rapid QuEChERS method for the analysis of BPA
    in pigmented and non-pigmented canned peaches, pineapple, green tea, and tuna products. No sample preparation is required prior to the extraction step. Recoveries of
    86.6 to 112.0% is demonstrated in a BPA concentration range of 3-10 ng/g
    _________________________________________________________________________________________________________________________________________
    Don Shelly, Food and Environmental Technical Service, UCT LLC., 2731 Bartram Road, Bristol PA, 19007, USA, Phone 717-247-0896, Email: dshelly@unitedchem.com