Comprehensive screening method for the qualitative detection of narcotics and stimulants using single step derivatisation

A selective and sensitive screening method for the detection of prohibited narcotic and stimulating agents in doping control is described and validated. This method is suitable for the detection of all narcotic agents mentioned on the World Anti-Doping Agency (WADA) doping list in addition to numerous stimulants. The analytes are extracted from urine by a combined extraction procedure using CH2Cl2/MeOH (9/1, v/v) and t-butylmethyl ether as extraction solvents at pH 9.5 and 14, respectively. Prior to GC–MS analysis the obtained residues are combined and derivatised with MSTFA. The mass spectrometer is operated in the full scan mode in the range between m/z 40 and 550. The obtained limits of detection (LOD) for all components included in this extensive screening method are in the range 20–500 ng/ml, which is in compliance with the requirements set by WADA. Besides narcotic and stimulating agents, this method is also capable of detecting several agents with anti-estrogenic activity and some beta-agonists. As an example, a positive identification of hydroxyl-methoxy-tamoxyfen is shown.