title: [Determination of bambuterol in human plasma by liquid chromatography-electrospray tandem mass spectrometry: application to pharmacokinetic study].
abstract: OBJECTIVE
  To develop a sensitive, specific and accurate method for quantifying bambuterol in human plasma and to study pharmacokinetics of bambuterol in male healthy Chinese.
  
  
  METHODS
  Plasma samples were prepared based on a simple liquid-liquid extraction. The extracted samples were analyzed on liquid chromatography using a Zorbax SB C18 column interfaced with a triple quadrupole tandem mass spectrometer and detected by use of selected reaction monitoring mode.
  
  
  RESULTS
  The linear calibration curves were obtained in the concentration range of 0.05-4.0 ng.mL-1. The limit of quantification was 0.05 ng.mL-1. The intra- and inter-run precision was measured to be below 7%. The inter-run accuracy was less than 8% for the analyte. After an oral administration of 10 mg bambuterol hydrochloride to 18 healthy Chinese volunteers the main pharmacokinetic parameters of bambuterol were as follows: Tmax was (2.3 +/- 1.3) h; Cmax was (3.95 +/- 2.20) ng.mL-1; T1/2 was (11.4 +/- 6.1) h and AUC0-t was (26.85 +/- 11.77) ng.h.mL-1.
  
  
  CONCLUSIONS
  The method is shown to be accurate, robust and convenient, and suitable for pharmacokinetic studies of bambuterol. It was found that there was marked inter-individual difference in the pharmacokinetics of bambuterol in Chinese volunteers after a single oral dose, which may be attributed to the difference of activity of cholinesterase, an enzyme catalyzing bambuterol metabolism.
authors.affiliation: Laboratory of Drug Metabolism and Pharmacokinetics, Shenyang Pharmaceutical University, Shenyang 110016, China.
authors.forename: X Y
authors.initials: XY
authors.lastname: Chen
authors.forename: H Y
authors.initials: HY
authors.lastname: Xu
authors.forename: D F
authors.initials: DF
authors.lastname: Zhong
authors.forename: H Y
authors.initials: HY
authors.lastname: Yang
authors.forename: Y F
authors.initials: YF
authors.lastname: Zhang
mesh_terms: D000328:Adult; D019540:Area Under Curve; D001993:Bronchodilator Agents / Q000097:blood* / Q000493:pharmacokinetics; D002851:Chromatography, High Pressure Liquid; D006801:Humans; D008297:Male; D021241:Spectrometry, Mass, Electrospray Ionization; D013726:Terbutaline / Q000031:analogs & derivatives* / Q000097:blood* / Q000493:pharmacokinetics
chemical_list: D001993:Bronchodilator Agents; D013726:Terbutaline; C047766:bambuterol