title: Determination of tamsulosin in dog plasma by liquid chromatography with atmospheric pressure chemical ionization tandem mass spectrometry.
abstract: A rapid, sensitive and accurate liquid chromatographic-tandem mass spectrometric method is described for the determination of tamsulosin in dog plasma. Tamsulosin was extracted from plasma using a mixture of hexane-ethyl acetate (2:1, v/v) and separated on a C18 column interfaced with a triple quadrupole tandem mass spectrometer. The mobile phase consisting of a mixture of methanol, water and formic acid (80:20:1, v/v/v) was delivered at a flow rate of 0.5 ml/min. Atmospheric pressure chemical ionization (APCI) source was operated in positive ion mode. Selected reaction monitoring (SRM) mode using the transitions of m/z 409-->m/z 228 and m/z 256-->m/z 166.9 were used to quantify tamsulosin and the internal standard, respectively. The linearity was obtained over the concentration range of 0.1-50.0 ng/ml for tamsulosin and the lower limit of quantitation was 0.1 ng/ml. For each level of QC samples, inter- and intra-run precision was less than 5.0 and 4.0% (relative standard deviation (R.S.D.)), respectively, and accuracy was within +/-0.3% (relative error (R.E.)). This method was successfully applied to pharmacokinetic study of a tamsulosin formulation product after oral administration to beagle dogs.
authors.affiliation: Department of Chemistry, School of Chemical Engineering and Materials Science, Beijing Institute of Technology, Beijing 100081, China. mlqi@bit.edu.cn
authors.forename: Meiling
authors.initials: M
authors.lastname: Qi
authors.forename: Peng
authors.initials: P
authors.lastname: Wang
authors.forename: Lihe
authors.initials: L
authors.lastname: Liu
mesh_terms: D000284:Administration, Oral; D058668:Adrenergic alpha-1 Receptor Antagonists; D000317:Adrenergic alpha-Antagonists / Q000008:administration & dosage / Q000097:blood* / Q000493:pharmacokinetics; D000818:Animals; D001274:Atmospheric Pressure; D002853:Chromatography, Liquid / Q000379:methods*; D004285:Dogs; D013058:Mass Spectrometry / Q000379:methods*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013449:Sulfonamides / Q000008:administration & dosage / Q000097:blood* / Q000493:pharmacokinetics; D000077409:Tamsulosin
chemical_list: D058668:Adrenergic alpha-1 Receptor Antagonists; D000317:Adrenergic alpha-Antagonists; D013449:Sulfonamides; D000077409:Tamsulosin