title: Pharmacokinetics of magnesium lithospermate B after intravenous administration in beagle dogs.
abstract: OBJECTIVE
  To develop a specific liquid chromatography-tandem mass spectrometry (LC-MS/MS) method for the pharmacokinetic study of magnesium lithospermate B (MLB), and study the pharmacokinetics of MLB after i.v. administration in beagle dogs.
  
  
  METHODS
  Each beagle dog was iv administered MLB 3, 6, and 12 mg/kg random. The serum drug concentration was determined by specific liquid chromatography-tandem mass spectrometry (LC-MS/MS) assays. The pharmacokinetic parameters were calculated by Drug and Statistics version 1.0 program.
  
  
  RESULTS
  The calibration curve for MLB was linear over a range of 16-4096 microg/L with coefficients of correlation >0.999. The intra- and inter-day precisions (CV) of analysis were <10 %, and accuracy ranged from 90 % to 113 %. After i.v. administration of MLB at the doses of 3, 6, and 12 mg/kg, the C(0) values for MLB were estimated to be of 24, 47, and 107 mg/L, respectively. The AUC increased with the increasing doses for iv administration, and the mean AUC(0-t) values were 109.3, 247.9, and 582.4 mg x min x L(-1), respectively. MLB was distributed and eliminated quickly from central compartment, the mean T(1/2alpha) values for MLB at doses of 3, 6, 12 mg/kg were 2.2, 2.7, and 2.9 min, and the mean T(1/2beta) values were 43, 42, and 42 min, respectively.
  
  
  CONCLUSIONS
  This LC-MS/MS method is rapid, sensitive, and specific for the pharmacokinetic study of MLB. The kinetic process of MLB in beagle dogs in vivo was best fitted to a two-compartment model. For i.v. administration, the pharmacokinetic parameters of C(0) and AUC have good linearity among the doses, and MLB was distributed and eliminated quickly in beagle dogs.
authors.affiliation: Department of Pharmacology, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, China.
authors.forename: Xiao-chuan
authors.initials: XC
authors.lastname: Li
authors.forename: Chen
authors.initials: C
authors.lastname: Yu
authors.forename: Wei-kang
authors.initials: WK
authors.lastname: Sun
authors.forename: Gang-yi
authors.initials: GY
authors.lastname: Liu
authors.forename: Jing-ying
authors.initials: JY
authors.lastname: Jia
authors.forename: Yi-ping
authors.initials: YP
authors.lastname: Wang
mesh_terms: D000818:Animals; D019540:Area Under Curve; D004285:Dogs; D004365:Drugs, Chinese Herbal / Q000008:administration & dosage / Q000302:isolation & purification / Q000493:pharmacokinetics*; D005260:Female; D016166:Free Radical Scavengers / Q000008:administration & dosage / Q000493:pharmacokinetics*; D007275:Injections, Intravenous; D008297:Male; D010946:Plants, Medicinal / Q000737:chemistry; D027561:Salvia miltiorrhiza / Q000737:chemistry; D021241:Spectrometry, Mass, Electrospray Ionization; D014018:Tissue Distribution
chemical_list: D004365:Drugs, Chinese Herbal; D016166:Free Radical Scavengers; C061091:lithospermate B