The bioactivity of 2,5-dimethoxy-4-ethylthiophenethylamine (2C-T-2) and its detection in rat urine by capillary electrophoresis combined with an on-line sample concentration technique

The bioactivity of 2,5-dimethoxy-4-ethylthiophenethylamine (2C-T-2) on nitric oxide (NO) production and the proliferation of spleen and thymus lymphocytes to mitogen stimulation in mice are reported for the first time. NO production by T and B lymphocytes in spleen and T cells in the thymus of mice decreased after the oral administration of 2C-T-2. This indicates that 2C-T-2 intake may perturb both neural and immune activity since a decrease in NO production is indicative of a weakened defense function. 2C-T-2 (the parent drug) in rat urine samples was detected by means of capillary electrophoresis/UV absorbance combined with an on-line sample concentration technique. When the CZE and MEKC modes were employed, the detection limit was found to be 4.5 and 5.0mug/mL (at a 92. 1 % confidence level); whereas when on-line sample concentration methods, including stacking and sweeping-micellar electrokinetic chromatography were used, the detection limits were improved to 19.2 and 9.1 ng/mL, respectively. ln an analysis of some actual samples from animal experiments, three male rats were administered 20 mug/g of body weight of 2C-T-2 by intra-peritoneal injection. The first-and second-day urine fractions were collected after the administration, for use in the analysis. As a result, 2.9 mug/mL and 0.25 mug/mL of 2C-T-2, respectively, were detected after ingestion of the doses. (C) 2004 Elsevier B.V. All rights reserved.