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Journal of Analytical Toxicology|July 1, 1983
Applicability of capillary gas chromatography to systematic toxicological analysis: occurrence of concentration-dependent retention behaviorM Bogusz, J Wijsbeek, J P Franke, et al.Journal of Chromatography|July 23, 1993
Study of lot-to-lot reproducibilities of Bond Elut Certify and Clean Screen DAU mixed-mode solid-phase extraction columns in the extraction of drugs from whole bloodX H Chen, J P Franke, J Wijsbeek, et al.Journal of Analytical Toxicology|May 1, 1994
Determination of basic drugs extracted from biological matrices by means of solid-phase extraction and wide-bore capillary gas chromatography with nitrogen-phosphorus detectionX H Chen, J P Franke, J Wijsbeek, et al.Journal of Chromatography|September 8, 1993
Reusability of Bond Elut Certify columns for the extraction of drugs from plasmaX H Chen, J P Franke, J Wijsbeek, et al.Journal of Forensic Sciences|January 1, 1992
A single-column procedure on Bond Elut Certify for systematic toxicological analysis of drugs in plasma and urineX H Chen, J Wijsbeek, J P Franke, et al.Journal of Forensic Sciences|April 1, 1986
Multicenter evaluation of ultrafiltration, dialysis, and thermal coagulation as sample pretreatment methods for the colorimetric determination of paraquat in blood and tissuesR A de Zeeuw, J Wijsbeek, J P Franke, et al.Journal of Analytical Toxicology|March 1, 1985
Impact of biological matrix, drug concentration, and method of isolation on detectability and variability of retention index values in gas chromatographyM Bogusz, J Wijsbeek, J P Franke, et al.Journal of Analytical Toxicology|July 1, 1984
Impact of biological matrix and isolation methods on detectability and interlaboratory variations of TLC Rf-values in systematic toxicological analysisM Bogusz, M Klys, J Wijsbeek, et al.Journal of Chromatography|April 2, 1993
Semi-automated solid-phase extraction procedure for drug screening in biological fluids using the ASPEC system in combination with Clean Screen DAU columnsX H Chen, J P Franke, K Ensing, et al.Journal of Analytical Toxicology|July 1, 1996
An enzymic digestion and solid-phase extraction procedure for the screening for acidic, neutral, and basic drugs in liver using gas chromatography for analysisZ P Huang, X H Chen, J Wijsbeek, et al.Pageof 4