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Boatto G, Nieddu M, Carta A, Pau A, Palomba M, Asproni B, Cerri R. 
“Determination of amphetamine-derived designer drugs in human urine by SPE extraction and capillary electrophoresis with mass spectrometry detection”. 
J Chromatogr B Analyt Technol Biomed Life Sci. 2005 Jan 20;814(1):93-8.
In recent years, a number of newer designer drugs have entered the illicit drug market. The methylenedioxy-derivates of amphetamine represent the largest group of designer drugs. This paper describes a method for screening for and quantification of ten 2,5-methylenedioxy-derivates of amphetamine and phenylethylamine in human urine, using capillary electrophoresis coupled to electrospray ionisation-mass spectrometry CE-ESI-MS. Prior to CE-MS analysis, a simple solid-phase extraction SPE was used for sample cleanup. The method was validates according to international guidelines.
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