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Journal of Pharmaceutical and Biomedical Analysis|January 1, 1986
Determination of carbisocaine, heptacaine and pentacaine in plasma by capillary gas chromatography with nitrogen-selective detectionV Marko, J Wijsbeek, R A De ZeeuwJournal of Analytical Toxicology|March 25, 2000
SPEC disc solid-phase extraction for rapid broad-spectrum drug screening in urineR A de Zeeuw, J Wijsbeek, J P FrankeJournal of Lipid Research|July 1, 1970
Separation of sterols by vapor-programmed thin-layer chromatographyW H Wientjens, R A De Zeeuw, J WijsbeekJournal of Pharmaceutical and Biomedical Analysis|January 1, 1988
Impact of urine matrix and isolation procedure on retention behaviour of basic drugs in thin-layer chromatographyJ P Franke, R A De Zeeuw, J WijsbeekJournal of Analytical Toxicology|July 1, 1986
Potentials of wide-bore fused silica capillary columns for substance identification by means of retention indicesJ P Franke, R A de Zeeuw, J WijsbeekPharmaceutisch Weekblad. Scientific Edition|August 26, 1983
Capillary gas chromatography on fused silica columns with splitless injection: the determination of phenobarbital in blood plasmaJ P Franke, J Wijsbeek, R A de ZeeuwJournal of Analytical Toxicology|November 1, 1986
Influence of biological matrix on retention behaviour and identification possibilities of selected neutral and acidic drugs in thin layer chromatography. An interlaboratory investigationM Bogusz, J P Franke, J Wijsbeek, et al.Journal of Analytical Toxicology|November 1, 1992
Isolation of acidic, neutral, and basic drugs from whole blood using a single mixed-mode solid-phase extraction columnX H Chen, J P Franke, J Wijsbeek, et al.Veterinary and Human Toxicology|January 1, 1979
Isolation and determination of quaternary ammonium compounds by means of XAD-columns and thin layer chromatographyL P Franke, J Wijsbeek, J E Greving, et al.Archives of Toxicology|June 8, 1979
Isolation and determination of quaternary ammonium compounds by means of amberlite XAD-columns and thin layer chromatographyJ P Franke, J Wijsbeek, J E Greving, et al.Pageof 4