title: A new high-performance liquid chromatography assay for the determination of sesquiterpene lactone 15-deoxygoyazensolide in rat plasma.
abstract: A simple, rapid and sensitive high-performance liquid chromatography method was developed for the analysis of the sesquiterpene lactone 15-deoxygoyazensolide (LAC15-D) in rat plasma samples. The chromatographic separation was achieved on a LiChrospher RP18 column using methanol:water (50:50, v/v) containing 0.6% acetic acid as mobile phase, at a flow rate of 0.7 mL min(-1). UV detection was carried out at 270 nm. Phenytoin was used as internal standard. Prior to the analysis, the rat plasma samples were submitted to liquid-liquid extraction with dichloromethane. The mean absolute recoveries were 73% with R.S.D. values lower than 3.5. The method was linear over the 6.0-2000 ng mL(-1) concentration range and the quantification limit was 6.0 ng mL(-1). Within-day and between-day assay precision and accuracy were studied at three concentration levels (15, 300 and 480 ng mL(-1)) and were lower than 15%. The validated method was used to measure the plasmatic concentration of LAC15-D in rats that received a single intraperitoneal dose of 30 mg kg(-1).
authors.affiliation: University of São Paulo, Faculty of Pharmaceutical Sciences of Ribeirão Preto, Ribeirão Preto, SP, Brazil. jabor@usp.br
authors.forename: Valquiria Aparecida Polisel
authors.initials: VA
authors.lastname: Jabor
authors.forename: Michel David
authors.initials: MD
authors.lastname: dos Santos
authors.forename: Pierina Sueli
authors.initials: PS
authors.lastname: Bonato
authors.forename: Dayana Rubio
authors.initials: DR
authors.lastname: Gouvea
authors.forename: Norberto Peporine
authors.initials: NP
authors.lastname: Lopes
mesh_terms: D000818:Animals; D002138:Calibration; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D006575:Heterocyclic Compounds, 3-Ring / Q000097:blood*; D051381:Rats; D012015:Reference Standards; D015203:Reproducibility of Results; D013056:Spectrophotometry, Ultraviolet
chemical_list: C498361:15-deoxygoyazensolide; D006575:Heterocyclic Compounds, 3-Ring