Sensitive determination of MDMA and its metabolite MDA in rat blood and brain microdialysates by HPLC with fluorescence detection
Biomedical Chromatography – May 02, 2007
Source: OpenAlex
Summary
A new method effectively detects MDMA and its metabolite MDA in rat blood and brain microdialysates, achieving detection limits as low as 1.2 ng/mL for MDA and 4.2 ng/mL for MDMA. Utilizing high-performance liquid chromatography with fluorescence detection, the calibration curves showed linearity from 2.5 to 500 ng/mL for MDA and 5.0 to 1000 ng/mL for MDMA. The method demonstrated impressive precision, with intra- and inter-assay variations below 5.6%. This advancement aids pharmacokinetic studies of these substances in forensic toxicology and drug analysis.
Abstract
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‐1 H ‐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 m m 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. Copyright © 2007 John Wiley & Sons, Ltd.