title: Quantitation of salbutamol in human urine by liquid chromatography-electrospray ionization mass spectrometry.
abstract: A sensitive and specific liquid chromatography-electrospray ionization-mass spectrometry (LC-ESI-MS) is described for quantitation of salbutamol in human urine using nadolol as the internal standard (I.S.). Urine samples were hydrolyzed with beta-glucuronidase followed by a solid-phase extraction procedure using Bond Elut-Certify cartridges. The HPLC column was an Agilent Zorbax SB-C(18) column. A mixture of 0.01 M ammonium formate buffer (pH 3.5)-acetonitrile (85:15, v/v) was used as the mobile phase. Analytes were quantitated using positive electrospray ionization in a quadrupole spectrometer. Selected ion monitoring (SIM) mode was used to monitor m/z 166 for salbutamol and m/z 310 for I.S. Good linearity was obtained in the range of 10.0-2000.0 ng/ml. The limit of quantification was 10.0 ng/ml. The intra- and inter-run precision, calculated from quality control (QC) samples was less than 7.3%. The accuracy as determined from QC samples was within +/-2.6%. The method was applied for determining excretion curves of salbutamol.
authors.affiliation: China Doping Control Center, National Research Institute of Sports Medicine, The State Sport General Administration, 1 Anding Road, Beijing 100029, China. zhang.jianli@sohu.com
authors.forename: Jianli
authors.initials: J
authors.lastname: Zhang
authors.forename: Youxuan
authors.initials: Y
authors.lastname: Xu
authors.forename: Xin
authors.initials: X
authors.lastname: Di
authors.forename: Moutian
authors.initials: M
authors.lastname: Wu
mesh_terms: D000420:Albuterol / Q000652:urine*; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D005260:Female; D006801:Humans; D008297:Male; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D021241:Spectrometry, Mass, Electrospray Ionization / Q000379:methods
chemical_list: D000420:Albuterol