title: Determination of ephedrines in urine by high-performance liquid chromatography.
abstract: An improved high-performance liquid chromatographic method with ultraviolet detection for the simultaneous determination of norephedrine, norpseudoephedrine, ephedrine, pseudoephedrine, methylephedrine and ethylephedrine in urine is described. The six substances were separated on a reversed-phase column with phosphate buffer-triethylamine (pH 5.5) as the mobile phase. The linearity and reproducibility were satisfactory for the levels usually found in urine (1-30 micrograms/ml).
authors.affiliation: Laboratorio de Control del Dopaje, ICEF y D, Consejo Superior de Deportes, Madrid, Spain.
authors.forename: C
authors.initials: C
authors.lastname: Imaz
authors.forename: D
authors.initials: D
authors.lastname: Carreras
authors.forename: R
authors.initials: R
authors.lastname: Navajas
authors.forename: C
authors.initials: C
authors.lastname: Rodriguez
authors.forename: A F
authors.initials: AF
authors.lastname: Rodriguez
authors.forename: J
authors.initials: J
authors.lastname: Maynar
authors.forename: R
authors.initials: R
authors.lastname: Cortes
mesh_terms: D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D004809:Ephedrine / Q000031:analogs & derivatives / Q000652:urine*; D006801:Humans; D015203:Reproducibility of Results; D013056:Spectrophotometry, Ultraviolet
chemical_list: D004809:Ephedrine