title: Determination of cocaine and benzoylecgonine in guinea pig's hair after a single dose administration by LC-MS/MS.
abstract: A sensitive LC-MS/MS method to determine cocaine and its major metabolite benzoylecgonine in guinea pig' s hair has been established. About 20 mg of decontaminated hair sample was hydrolyzed with 0. 1 mol x L(-1) HCl at 50 degrees C overnight, in the presence of cocaine-d3 and benzoylecgonine-d8 used as internal standards, and then extracted with dichlormethane. The analysis was performed by liquid chromatography-tandem mass spectrometry (LC-MS/MS). Positive electrospray ionization (ESI +) and multiple reactions monitoring (MRM) mode were used. The limit of detection (LOD) for cocaine and benzoylecgonine was 1 pg x mg(-1). The calibration curves of extracted standards were linear over the range from 5 pg x mg(-1) to 250 pg x mg(-1) (r2 > or = 0.9997). The method was validated and applied to the analysis of guinea pig's hair after a single dose administration of cocaine hydrochloride. Cocaine and benzoylecgonine were not only detected, but also quantified in guinea pigs hair.
authors.affiliation: Department of Forensic Toxicology, Institute of Forensic Sciences, Ministry of Justice, Shanghai 200063, China.
authors.forename: Qi-ran
authors.initials: QR
authors.lastname: Sun
authors.forename: Ping
authors.initials: P
authors.lastname: Xiang
authors.forename: Hui
authors.initials: H
authors.lastname: Yan
authors.forename: Min
authors.initials: M
authors.lastname: Shen
mesh_terms: D000818:Animals; D002851:Chromatography, High Pressure Liquid; D003042:Cocaine / Q000008:administration & dosage / Q000031:analogs & derivatives* / Q000032:analysis* / Q000378:metabolism; D006168:Guinea Pigs; D006197:Hair / Q000737:chemistry* / Q000378:metabolism; D021241:Spectrometry, Mass, Electrospray Ionization; D053719:Tandem Mass Spectrometry
chemical_list: C005618:benzoylecgonine; D003042:Cocaine