Abstract
Eleven side chain positional isomers of methamphetamine can be distinguished from methamphetamine using a combination of the Marquis colour test, gas chromatography (GC), high performance liquid chromatography (HPLC) and mass spectrometry (MS). Many of the compounds gave identical colour tests, and several had similar mass spectral fragmentation patterns, but the combined technique of GC MS unequivocally differentiates all the isomers.
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