Lacroix C, Wojciechowski F, Danger P
Laboratoire de Pharmacocinétique, Centre Hospitalier, Le Havre, France.
J Chromatogr. 1993 Aug 11;617(2):285-90. doi: 10.1016/0378-4347(93)80500-4.
A column-switching high-performance liquid chromatographic method for the simultaneous determination of clobazam, diazepam and their main metabolites in human plasma is described. A 200-microliters plasma sample was directly injected into a precolumn filled with TSK-gel PW. After a washing step with potassium phosphate buffer, the retained substances were backflushed into a reversed-phase column with a mobile phase of acetonitrile-phosphate buffer-diethylamine. Various drugs frequently co-administered with clobazam or diazepam do not interfere with the determination.