title: [Simple and rapid screening for methamphetamine and 3,4-methylenedioxymethamphetamine (MDMA) and their metabolites in urine using direct analysis in real time (DART)-TOFMS].
abstract: An ionization technique, direct analysis in real time (DART) has recently been developed for the ambient ionization of a variety samples. The DART coupled with time-of-flight mass spectrometry (TOFMS) would be useful as a simple and rapid screening for the targeted compounds in various samples, because it provides the molecular information of these compounds without time-consuming extraction. In this study, we investigated rapid screening methods of illicit drugs and their metabolites, such as methamphetamine (MA), 3,4-methylenedioxymethamphetamine (MDMA), amphetamine (AP) and 3,4-methylenedioxyamphetamine (MDA) in human urine using DART-TOFMS. As serious matrix effects caused by urea in urine samples and ionizations of the targeted compounds were greatly suppressed in the DART-TOFMS analyses, simple pretreatment methods to remove the urea from the samples were investigated. When a pipette tip-type solid-phase extraction with a dichloromethane and isopropanol mixed solution as an eluent was used for the pretreatment, the limits of detection (LODs) of 4 compounds added to control urine samples were 0.25 µg/ml. On the other hand, the LODs of these compounds were 0.5 µg/ml by a liquid-liquid extraction using a dichloromethane and hexane mixed solution. In both extractions, the recoveries of 4 compounds from urine samples were over 70% and these extraction methods showed good linearity in the range of 0.5-5 µg/ml by GC-MS analyses. In conclusion, our proposed method using DART-TOFMS could simultaneously detect MA, MDMA and their metabolites in urine at 0.5 µg/ml without time-consuming pretreatment steps. Therefore it would be useful for screening drugs in urine with the molecular information.
authors.affiliation: National Institute of Health Sciences, Tokyo, Japan.
authors.forename: Maiko
authors.initials: M
authors.lastname: Kawamura
authors.forename: Ruri
authors.initials: R
authors.lastname: Kikura-Hanajiri
authors.forename: Yukihiro
authors.initials: Y
authors.lastname: Goda
mesh_terms: D006801:Humans; D013058:Mass Spectrometry / Q000379:methods*; D008694:Methamphetamine / Q000652:urine*; D018817:N-Methyl-3,4-methylenedioxyamphetamine / Q000652:urine*; D015813:Substance Abuse Detection / Q000379:methods*
chemical_list: D008694:Methamphetamine; D018817:N-Methyl-3,4-methylenedioxyamphetamine