title: Doping control for metandienone using hair analyzed by gas chromatography-tandem mass spectrometry.
abstract: A sensitive, specific and reproducible method for the quantitative determination of the anabolic metandienone in human hair has been developed. The preparation involved a decontamination step with methylene chloride. The hair sample (about 50 mg) was solubilised in 1 ml 1 M NaOH, 10 min at 95 degrees C, in presence of 2 ng of nandrolone-d(3) used as internal standard. The homogenate was neutralized and extracted using consecutively a solid-phase extraction (Isolute C(18) eluted with methanol) and a liquid-liquid extraction with pentane. The residue was derivatized by adding 5 microl MSTFA/NH(4)I/2-mercaptoethanol (250 microl; 5 mg; 15 microl) and 45 microl MSTFA, then incubated for 20 min at 60 degrees C. A 1 microl aliquot of derivatized extract was injected into the column (HP5-MS capillary column, 5% phenyl-95% methylsiloxane, 30 m x 0.32 mm i.d., 0.25 microm film thickness) of a Hewlett Packard (Palo Alto, CA, USA) gas chromatograph (6890 Series). Metandienone was identified using three transitions (its daughter ions at m/z 339 and 206 for the parent 444 and 191 for 206) using a Waters Quattro Micro MS-MS system. The transition m/z 444 to 206 has been used as quantification transition and the others as identification transitions. The assay was capable of detecting 2 pg/mg of metandienone when approximately 50 mg of hair material was processed. Linearity was observed for metandienone concentrations ranging from 2 to 500 pg/mg with a correlation coefficient of 0.9997. Intra-day and between-day precisions at 50 pg/mg were 13.4-16.5% and 22.0%, respectively, with an extraction recovery of 48%. The analysis of hair, cut into four segments, obtained from an athlete, revealed the presence of metandienone at the concentrations of 78, 7, 10 and 108 pg/mg in each segment of hair (0-1, 1-2, 2-3 and 3 cm to the tip).
authors.affiliation: Laboratoire Chemtox, 3 rue Grüninger, Parc d'innovation, F-67400 Illkirch, France.
authors.forename: Marie
authors.initials: M
authors.lastname: Bresson
authors.forename: Vincent
authors.initials: V
authors.lastname: Cirimele
authors.forename: Marion
authors.initials: M
authors.lastname: Villain
authors.forename: Pascal
authors.initials: P
authors.lastname: Kintz
mesh_terms: D045930:Anabolic Agents / Q000032:analysis*; D004300:Doping in Sports; D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods*; D006197:Hair / Q000737:chemistry*; D006801:Humans; D008696:Methandrostenolone / Q000032:analysis*; D012015:Reference Standards; D015203:Reproducibility of Results
chemical_list: D045930:Anabolic Agents; D008696:Methandrostenolone