title: Determination and pharmacokinetic analysis of salvianolic acid B in rat blood and bile by microdialysis and liquid chromatography.
abstract: Salvianolic acid B is an herbal ingredient isolated from Salvia miltiorrhiza. An in vivo microdialysis sampling method coupled to high-performance liquid chromatography has been developed for continuous monitoring of protein-unbound salvianolic acid B in rat blood and bile. Microdialysis probes were inserted into the jugular vein/right atrium and bile duct of Sprague-Dawley rats, and a dose of 100 mg/kg salvianolic acid B was then administered via the femoral vein. Dialysates were collected and directly injected into a liquid chromatographic system. Salvianolic acid B was eluted using a microbore reversed-phase ODS 5 microm (150 mm x 1 mm I.D.) column. Isocratic elution of salvianolic acid B was achieved within 10 min using the liquid chromatographic system. The chromatographic mobile phase consisted of acetonitrile-methanol-20 mM monosodium phosphoric acid (pH 3.5) (10:30:60, v/v/v) containing 0.1 mM 1-octanesulfonic acid with 0.05 ml/min. The wavelength of the UV detector was set at 290 nm. Salvianolic acid B in both blood and bile dialysates was adequately determined using the liquid chromatographic conditions described, although the blank bile pattern was more complex. The retention times of salvianolic acid B in rat blood and bile dialysates were found to be 7.2 min. Peak-areas of salvianolic acid B were linear (r2 > 0.995) over a concentration range of 0.1-50 microg/ml. In vivo recoveries of microdialysis probes of salvianolic acid B in rat blood and bile averaged 22 +/- 2% and 41 +/- 1%, respectively. This study indicates that salvianolic acid B undergoes hepatobiliary excretion.
authors.affiliation: Institute of Traditional Medicine, National Yang-Ming University, Taipei, Taiwan.
authors.forename: Yen-Fei
authors.initials: YF
authors.lastname: Chen
authors.forename: Ine
authors.initials: I
authors.lastname: Jaw
authors.forename: Ming-Shi
authors.initials: MS
authors.lastname: Shiao
authors.forename: Tung-Hu
authors.initials: TH
authors.lastname: Tsai
mesh_terms: D000818:Animals; D001572:Benzofurans / Q000097:blood* / Q000493:pharmacokinetics; D001646:Bile / Q000378:metabolism*; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D008297:Male; D017551:Microdialysis; D051381:Rats; D017207:Rats, Sprague-Dawley; D012015:Reference Standards; D053630:Depsides
chemical_list: D001572:Benzofurans; C076944:salvianolic acid B; D053630:Depsides