This still remains a great challenge for analytical chemists and may rely on identification of different target compounds. In the case of precursor drug administration, the parent compounds are usually detectable only for a short time, before being fully metabolised or decomposed. For this reason parent compounds can rarely be used for differentiating. Specific metabolites are usually detectable for a much longer time. Their use as target compounds for differentiating has found little application however, since all metabolites are not extracted together with MA and AM and are additionally fully converted to AM or MA after a certain time post administration. Enantiomeric profiles for methamphetamine and/or amphetamine, metabolically formed from precursors have been described for some medicaments and have been used successfully for differentiating between illicit intake and intake of precursors. Thus a reliable method for the quantitative determination of AM/MA enantiomers is essential for differentiation (Kraemer and Mauer, 2002; Musshof, 2000).
A great number of research efforts have focussed on the separation of AM/MA enantiomers particularly from urine or blood matrices. These have been extensively reviewed (e.g. Kraemer and Mauer, 1998; Musshof, 2000). ...Show more