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  • Title: On-line coupling of solid-phase extraction and capillary electrophoresis for the determination of cefoperazone and ceftiofur in plasma.
    Author: Puig P, Tempels FW, Borrull F, Calull M, Aguilar C, Somsen GW, de Jong GJ.
    Journal: J Chromatogr B Analyt Technol Biomed Life Sci; 2007 Sep 01; 856(1-2):365-70. PubMed ID: 17572160.
    Abstract:
    We present a method for determining two cephalosporins (cefoperazone and ceftiofur) in plasma by on-line solid-phase extraction (SPE)-capillary zone electrophoresis (CZE) with a T-split interface. Using this interface, a part of the SPE elution plug containing the cephalosporins is injected while the rest of the sample is flushed to waste. SPE was carried out using a C(18) micro-precolumn and the cephalosporins presented good retention properties with breakthrough volumes above 1 ml. Using a desorption volume of 426 nl of acetonitrile, recoveries were 75 and 90%, for cefoperazone and ceftiofur, respectively. The resulting elution volume was about 1.8 microl. A deproteinization step was included prior to SPE for the analysis of plasma samples with recoveries of 90 and 57% for cefoperazone and ceftiofur, respectively. With UV detection at 254 nm, linear relationships between the injected concentration and peak area was measured between 10 and 500 ng ml(-1) for standards, and 200 and 1500 ng ml(-1) for plasma samples. Intra-day (n=5) and inter-day (n=5) peak area repeatability were lower than 12% RSD. The detection limits obtained for spiked plasma (100 ng ml(-1) cefoperazone and ceftiofur) are sufficient for applying the method to pharmacokinetic studies.
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