title: Development and validation of a liquid chromatography/tandem mass spectrometry method for the determination of DMXAA in human and mouse plasma.
abstract: A rapid, sensitive, and specific LC/MS/MS-based method was developed for determining the concentration of DMXAA in human and mouse plasma. Sample preparation involved a single protein precipitation step using acetonitrile. Separation of DMXAA and 6-isopropoxy-9-oxoxanthene-2-carboxylic acid, the internal standard, was achieved on a Waters X-Terra C(18) (50 mm x 2.1mm i.d., 3.5 microm) analytical column using a mobile phase consisting of acetonitrile/10 mM ammonium acetate (55:45, v/v) containing 0.1% formic acid and isocratic flow at 0.2 mL/min for 3 min. The analytes were monitored by tandem mass spectrometry with electrospray positive ionization. Linear calibration curves were generated over the range of 5-3000 ng/mL. The values for precision and accuracy were <9.6%, except at the LLOQ (5 ng/mL) level, which was within 16.8%. Recovery of DMXAA in mouse plasma was >65%. DMXAA was stable through 2 freeze/thaw cycles, to 2h in mouse plasma or 50% acetonitrile, and on the autosampler to 5.1h. This method was subsequently used to measure concentrations of DMXAA in mice following intraperitoneal administration.
authors.affiliation: The Ludwig Center for Cancer Genetics & Therapeutics, Johns Hopkins University School of Medicine, Baltimore, MD 21231, USA.
authors.forename: Xiaosong
authors.initials: X
authors.lastname: Zhang
authors.forename: Ming
authors.initials: M
authors.lastname: Zhao
authors.forename: Michelle A
authors.initials: MA
authors.lastname: Rudek
authors.forename: Ping
authors.initials: P
authors.lastname: He
authors.forename: Bert
authors.initials: B
authors.lastname: Vogelstein
mesh_terms: D000818:Animals; D000970:Antineoplastic Agents / Q000097:blood* / Q000493:pharmacokinetics; D002138:Calibration; D002853:Chromatography, Liquid / Q000379:methods*; D006801:Humans; D051379:Mice; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D053719:Tandem Mass Spectrometry / Q000379:methods*; D044004:Xanthones / Q000097:blood* / Q000493:pharmacokinetics
chemical_list: D000970:Antineoplastic Agents; D044004:Xanthones; C066668:vadimezan