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DOI: 10.1016/S1570-0232(03)00043-6
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designer drug; metabolism; 4 '-methyl-alpha-pyrrolidinohexanophenone
R,S-4'-Methyl-alpha-pyrrolidinohexanophenone (MPHP) is a new designer drug which has appeared on the illicit drug market. The aim of this study was to identify the MPHP metabolites using solid-phase extraction, ethylation or acetylation, as well as to develop a toxicological detection procedure in urine using solid-phase extraction, trimethylsilylation and GC-MS. Analysis of urine samples of rats treated with MPHP revealed that MPHP was completely metabolized by hydroxylation of the tolyl methyl group followed by dehydrogenation to the corresponding carboxylic acid, hydroxylation of the side chain, hydroxylation of the pyrrolidine ring with subsequent dehydrogenation to the corresponding lactam and/or reduction of the keto group. The carboxy and/or hydroxy groups were found to be only partly conjugated. Based on these data, MPBP could be detected in urine via its metabolites by GC-MS using mass chromatography for screening and library search for identification. (C) 2003 Elsevier Science B.V. All rights reserved.
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