title: Determination of bromvalerylurea and its metabolites in biological samples by frit-fast atom bombardment liquid chromatography-mass spectrometry.
abstract: A simple, rapid, and sensitive method which allows us to simultaneously determine bromvalerylurea (BVU) and its three metabolites (3-methylbutyrylurea [MVU], alpha-(cystein-S-yl)isovalerylurea [CVU], and alpha-(N-acetylcystein-S-yl)isovalerylurea [AcCVU]) was investigated by frit-fast atom bombardment liquid chromatography-mass spectrometry (frit-FAB LC-MS). The LC-MS analysis was performed after the solid-phase extraction from tissue and urine samples with a Sep-Pak C18 cartridge. Tissue homogenates and urine were adjusted to pH 4.0 and applied to the cartridges. The retained BVU and its metabolites were eluted from the cartridge with 2 mL of acetonitrile/10 mM ammonium acetate buffer (pH 3.5, 50:50, v/v). The eluate was analyzed by LC-MS, which employs a semimicro type L-column ODS column. The proposed conditions are as follows: mobile phase A, 0.4% glycerol in acetonitrile/10 mM ammonium acetate buffer (pH 3.5) (5:95, v/v); mobile phase B, 0.4% glycerol in acetonitrile; elution mode, linear gradient, 100% A (5 min) to 100% B in 15 min; flow rate, 0.2 mL/min; split ratio, 1:40. Extraction recoveries of BVU and its metabolites were 91.90-97.79% from the spiked liver homogenate and 89.68-96.13% from the spiked urine. The detection limits ranged from 10 to 25 ng/g in selected ion monitoring mode.
authors.affiliation: Forensic Science Laboratory, Osaka Prefectural Police Headquarters, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Tsuchihashi
authors.forename: M
authors.initials: M
authors.lastname: Nishikawa
authors.forename: K
authors.initials: K
authors.lastname: Igarashi
authors.forename: M
authors.initials: M
authors.lastname: Tatsuno
authors.forename: M
authors.initials: M
authors.lastname: Katagi
authors.forename: F
authors.initials: F
authors.lastname: Kasuya
authors.forename: M
authors.initials: M
authors.lastname: Fukui
mesh_terms: D000818:Animals; D001968:Bromisovalum / Q000032:analysis* / Q000378:metabolism; D002853:Chromatography, Liquid / Q000379:methods*; D006801:Humans; D006993:Hypnotics and Sedatives / Q000032:analysis* / Q000652:urine; D008099:Liver / Q000737:chemistry; D008297:Male; D013058:Mass Spectrometry / Q000379:methods; D051381:Rats; D017208:Rats, Wistar
chemical_list: D006993:Hypnotics and Sedatives; D001968:Bromisovalum