Application of Empore C-8 Extraction Disks for Screening Urine in Systematic Toxicological Analysis

    Volume 37, Issue 2 (March 1992)

    ISSN: 0022-1198

    CODEN: JFSOAD

    Page Count: 7


    Temmink, A
    Senior research associate, senior research associate, research assistant, research assistant, and professor of toxicology, University Centre for Pharmacy, Groningen,

    Franke, JP
    Senior research associate, senior research associate, research assistant, research assistant, and professor of toxicology, University Centre for Pharmacy, Groningen,

    Ensing, K
    Senior research associate, senior research associate, research assistant, research assistant, and professor of toxicology, University Centre for Pharmacy, Groningen,

    de Zeeuw, RA
    Senior research associate, senior research associate, research assistant, research assistant, and professor of toxicology, University Centre for Pharmacy, Groningen,

    Chen, X-H
    Senior research associate, senior research associate, research assistant, research assistant, and professor of toxicology, University Centre for Pharmacy, Groningen,

    (Received 13 March 1991; accepted 24 July 1991)

    Abstract

    Solid-phase extraction (SPE) by means of disposable columns has become a widely accepted technique for sample pretreatment in toxicology, both for directed analyses and for screening analyses. However, the sample capacity in SPE is usually limited to a few millilitres.

    Therefore, we have investigated to what extent these problems can be overcome by using Empore extraction disks, consisting of chemically modified C-8 reversed-phase silica, embedded in an inert polytetrafluoroethylene (PTFE) matrix. Human urine was selected as the matrix and dexetimide and mepyramine were initially used as test drugs because these drugs were available in tritiated form. Additional drugs investigated included codeine, hexobarbital, imipramine, methamphetamine, and nitrazepam.

    In these investigations, the sample capacity for untreated urine was at least 25 mL, and analyte quantities up to 250 μg could be retained by these filters. Washing with water/methanol mixtures was successful in removing substantial amounts of endogenous interferences, and methanol proved to be an acceptable eluent. Thus, these disks seem to have interesting potential for toxicological analysis in that sample concentration and cleanup can be achieved at the same time.


    Paper ID: JFS13255J

    DOI: 10.1520/JFS13255J

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    Title Application of Empore C-8 Extraction Disks for Screening Urine in Systematic Toxicological Analysis
    Symposium , 0000-00-00
    Committee E30