[Studies on the detection of clonazepam and its main metabolites considering in particular thin-layer chromatography discrimination of nitrazepam and its major metabolic products (author's transl)].

The article describes analytical methods concerning screening tests for clonazepam and nitrazepam and the 7-amino derivatives. Further a detailed method is reported for the separation and identificatin of the benzodiazepine pair de. The method described permits a sharp separation and the nitro compounds with TiCl3 on the plate and forming the 7-acetamido derivatives by subsequent separation in the second dimension with ethyl acetate/acetic anhydride. The method described permits a sharp separation and highly sensitive detection by diazotization and coupling with Bratton-Marshall reagent. Amounts as low as 0.02 microng per spot can be detected. Besides preparation methods are reported for 7-aminoclonazepam, 7-acetaminoclonazepam, 2-amino-2'-chloro-5-nitrobenzophenone and 2,5-diamino-2'-chlorobenzophenone. Also spectral data (UV, IR, MS) and a literature review are given.