title: Sensitive determination of MDMA and its metabolite MDA in rat blood and brain microdialysates by HPLC with fluorescence detection.
abstract: Simultaneous determination of 3,4-methylenedioxymethamphetamine (MDMA) and 3,4-methylenedioxyamphetamine (MDA) in rat blood and brain microdialysates by high-performance liquid chromatography with fluorescence detection (HPLC-FL) was developed. Microdialysates were directly subjected to derivatization with 4-(4,5-diphenyl-1H-imidazol-2-yl)benzoyl chloride (DIB-Cl). The DIB-derivatives of MDMA, MDA and the internal standard, 1-methyl-3-phenylpropylamine (MPPA), were isocratically separated on an ODS column using a mixture of 50 mm phosphate buffer (pH 7.0)-acetonitrile-methanol-2-propanol (50:45:5:2, v/v/v/v %) as an eluent at a flow rate of 1.5 mL/min. The calibration curves of MDA and MDMA spiked to blood and brain microdialysates were linear over the ranges 2.5-500 and 5.0-1000 ng/mL, respectively. The detection limits of MDA and MDMA were 1.2 and 4.2 for blood and 1.3 and 4.8 ng/mL for brain, respectively. Additionally, the intra- and the inter-assay precisions were lower than 5.6% for the blood and brain microdialysates (n = 4). The proposed method was successfully applied for the monitoring of MDMA and its metabolite MDA in rat blood and brain microdialysates, and the pharmacokinetic parameters of MDMA and MDA in the microdialysates after administration of MDMA (5 mg/kg, i.p.) with or without caffeine (20 mg/kg, i.p.) were evaluated.
authors.affiliation: Department of Clinical Pharmacy, Course of Pharmaceutical Sciences, Graduate School of Biomedical Sciences, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki 852-8521, Japan.
authors.forename: Mamoru
authors.initials: M
authors.lastname: Tomita
authors.forename: Mihoko N
authors.initials: MN
authors.lastname: Nakashima
authors.forename: Mitsuhiro
authors.initials: M
authors.lastname: Wada
authors.forename: Kenichiro
authors.initials: K
authors.lastname: Nakashima
mesh_terms: D015104:3,4-Methylenedioxyamphetamine / Q000032:analysis* / Q000737:chemistry / Q000493:pharmacokinetics; D000818:Animals; D001565:Benzoates / Q000737:chemistry; D001774:Blood Chemical Analysis; D001923:Brain Chemistry; D002138:Calibration; D002851:Chromatography, High Pressure Liquid / Q000295:instrumentation / Q000379:methods; D005456:Fluorescent Dyes / Q000737:chemistry*; D007093:Imidazoles / Q000737:chemistry; D008297:Male; D017551:Microdialysis / Q000295:instrumentation / Q000379:methods; D018817:N-Methyl-3,4-methylenedioxyamphetamine / Q000032:analysis* / Q000737:chemistry / Q000493:pharmacokinetics; D010949:Plasma / Q000737:chemistry; D051381:Rats; D017208:Rats, Wistar; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D015813:Substance Abuse Detection / Q000295:instrumentation / Q000379:methods
chemical_list: C114684:4-(4,5-diphenyl-1H-imidazol-2-yl)benzoyl chloride; D001565:Benzoates; D005456:Fluorescent Dyes; D007093:Imidazoles; D015104:3,4-Methylenedioxyamphetamine; D018817:N-Methyl-3,4-methylenedioxyamphetamine