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Comparison of the separation of nine tryptamine standards based on gas chromatography, high performance liquid chromatography and capillary electrophoresis methods.

Wang MJ, Liu JT, Chen HM, Lin JJ, Lin CH

Department of Chemistry, National Taiwan Normal University, 88 Sec. 4, Tingchow Road, Taipei, Taiwan.

Nine tryptamines, including alpha-methyltryptamine (AMT), N,N-dimethyltryptamine (DMT), 5-methoxy-alpha-methyltryptamine (5-MeO-AMT), N,N-diethyltryptamine (DET), N,N-dipropyltryptamine (DPT), N,N-dibutyltryptamine (DBT), N,N-diisopropyltryptamine (DIPT), 5-methoxy-N,N-dimethyltryptamine (5-MeO-DMT), and 5-methoxy-N,N-diisopropyltryptamine (5-MeO-DIPT) were selected as model compounds. Comparisons of their sensitivity, selectivity, time, cost and the order of migration are described based on different separation techniques (GC, HPLC and CE, respectively). As a result, the limit of detection (S/N=3) obtained by GC/MS and LC/UV-absorption ranged from 0.5 to 15 microg/mL and 0.3 to 1.0 microg/mL, respectively. In contrast to this, based on the CZE/UV-absorption method, the limit of detection (S/N=3) was determined to 0.5-1 microg/mL. However, when the sweeping-MEKC mode was applied, it dramatically improved to 2-10 ng/mL. In the case of GC, HPLC and CE, migration times of the nine standards ranged from 11 to 15 min and 8 to 23 min by GC and HPLC, respectively; ranged from 20 to 26 min by sweeping-MEKC. The order of migration of DMT, DET, DPT and DBT follows the molecular weight, whereas the order of migration of AMT and 5-MeO-AMT (primary amines), DIPT (an isomer of DPT) and 5-methoxy-tryptamines (5-MeO-AMT, 5-MeO-DMT and 5-MeO-DIPT) can be altered by changing the separation conditions.

Published 4 February 2008 in J Chromatogr A, 1181(1): 131-6.
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