title: Determination of baicalin in rat cerebrospinal fluid and blood using microdialysis coupled with ultra-performance liquid chromatography-tandem mass spectrometry.
abstract: An in vivo microdialysis sampling method coupled with ultra-performance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS) was employed for continuous simultaneous monitoring of unbound baicalin in rat blood and brain. Microdialysis probes were inserted into the jugular vein and brain cerebrospinal fluid (CSF) of Sprague-Dawley rats then, following administration of baicalin at doses of 24mg/kg via the candal vein, samples were collected every 20min and injected directly into the UPLC-MS/MS system. In vitro recoveries of the probes were 19.26% and 18.38%, while in vivo recoveries of the probes were 15.0% and 17.52% for blood and brain, respectively. This improved method offers a rapid quantitative procedure for the determination of baicalin with a retention time of only 1.6min. The lower limit of quantification (LLOQ) and the lower limit of detection (LLOD) based on a signal-to-noise ratio of 5 were 2.37 and 0.1ng/ml for anticoagulant citrate dextrose (ACD) solution, and 1.185 and 0.3ng/ml for artificial cerebrospinal fluid (aCSF), respectively. The pharmacokinetics results indicated that baicalin could pass through the blood-brain barrier (BBB) and was detectable in brain dialysate. These in vivo microdialysis-based measurements provide a technique for simple sampling and rapid sensitive analysis of unbound baicalin in rat blood and CSF and for further application in pharmacokinetic studies.
authors.affiliation: College of Pharmacy, Shenyang Pharmaceutical University, Shenyang 110016, PR China.
authors.forename: Huifeng
authors.initials: H
authors.lastname: Huang
authors.forename: Yu
authors.initials: Y
authors.lastname: Zhang
authors.forename: Rui
authors.initials: R
authors.lastname: Yang
authors.forename: Xing
authors.initials: X
authors.lastname: Tang
mesh_terms: D000818:Animals; D000894:Anti-Inflammatory Agents, Non-Steroidal / Q000737:chemistry / Q000493:pharmacokinetics; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D005419:Flavonoids / Q000097:blood* / Q000134:cerebrospinal fluid* / Q000493:pharmacokinetics; D008297:Male; D017551:Microdialysis / Q000379:methods*; D015394:Molecular Structure; D051381:Rats; D017207:Rats, Sprague-Dawley; D015203:Reproducibility of Results; D053719:Tandem Mass Spectrometry / Q000379:methods*
chemical_list: D000894:Anti-Inflammatory Agents, Non-Steroidal; D005419:Flavonoids; C038044:baicalin