title: Development of a high performance liquid chromatography-tandem mass method for determination of bis(7)-tacrine, a promising anti-Alzheimer's dimer, in rat blood.
abstract: An analytical method using on-line high performance liquid chromatography-tandem mass spectrometry with electrospray ionization was developed and applied for the quantification of bis(7)-tacrine (B7T) in rat blood. B7T and pimozide (internal standard, IS) were extracted in a single step from 100 microl of alkalized blood with ethyl acetate. Analytes were separated using an Extend C-18 column at 25 degrees C. The elution was achieved isocratically with a mobile phase composed of 0.05% aqueous formic acid and acetonitrile (60:40, v/v) at a flow rate of 0.35 ml/min. Quantification was achieved by monitoring the selected ions at m/z 247 for B7T and m/z 462-->m/z 328 for pimozide. Retention times were 1.45 and 2.23 min for B7T and IS, respectively. Calibration curves were linear in the range from 86.4 to 2160.0 ng/ml. The established method is rapid, selective and sensitive for the identification and quantification of B7T in biological samples. The assay is accurate (bias <10%) and reproducible (intra- and inter-day variation <10%), with detection and quantification limit of 3.6 and 42.3 ng/ml, respectively. Furthermore, it was successfully applied for the pharmacokinetic measurement of B7T in rat with a single intravenous administration at 0.3mg/kg.
authors.affiliation: Department of Biochemistry, Hong Kong University of Science & Technology, Clear Water Bay, Kowloon, Hong Kong, SAR, PR China.
authors.forename: Hua
authors.initials: H
authors.lastname: Yu
authors.forename: Jason M K
authors.initials: JM
authors.lastname: Ho
authors.forename: Kelvin K W
authors.initials: KK
authors.lastname: Kan
authors.forename: Bobby W H
authors.initials: BW
authors.lastname: Cheng
authors.forename: Wen-Ming
authors.initials: WM
authors.lastname: Li
authors.forename: Li
authors.initials: L
authors.lastname: Zhang
authors.forename: Ge
authors.initials: G
authors.lastname: Lin
authors.forename: Yuan-Ping
authors.initials: YP
authors.lastname: Pang
authors.forename: Zhe-Ming
authors.initials: ZM
authors.lastname: Gu
authors.forename: Kelvin
authors.initials: K
authors.lastname: Chan
authors.forename: Yi-Tao
authors.initials: YT
authors.lastname: Wang
authors.forename: Yi-Fan
authors.initials: YF
authors.lastname: Han
mesh_terms: D000544:Alzheimer Disease / Q000188:drug therapy*; D000818:Animals; D019540:Area Under Curve; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D004355:Drug Stability; D005615:Freezing; D006207:Half-Life; D007275:Injections, Intravenous; D008297:Male; D008657:Metabolic Clearance Rate; D015394:Molecular Structure; D051381:Rats; D017207:Rats, Sprague-Dawley; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013619:Tacrine / Q000008:administration & dosage / Q000031:analogs & derivatives* / Q000097:blood / Q000737:chemistry / Q000493:pharmacokinetics / Q000627:therapeutic use; D053719:Tandem Mass Spectrometry / Q000379:methods*; D013997:Time Factors
chemical_list: C122128:1,7-N-heptylene-bis-9,9'-amino-1,2,3,4-tetrahydroacridine; D013619:Tacrine