title: Sensitive measurement of vinorelbine in dog plasma by liquid chromatography-electrospray ionization tandem mass spectrometry utilizing transitions from double-charged precursor ions.
abstract: A sensitive high-performance liquid chromatography/tandem mass spectrometry (LC/MS/MS) method for measuring vinorelbine was developed. A 100 µL aliquot of plasma was spiked with deuterium-labeled internal standard and subjected to solid-phase extraction using an Oasis HLB μ-elution plate. Two microliters of the extracted samples was directly injected into LC/MS/MS. Chromatographic separation was achieved on a Capcell Pak C18 UG column (2 × 75 mm) with a gradient elution of methanol (mobile phase B) against 0.05% formic acid in aqueous 10 mm ammonium formate (mobile phase A). The LC flow rate was set to 0.28 mL/min and the gradient (solvent B concentration) was processed from 40 to 90%. In mass spectrometric detection, observation of the reaction from a double-charged precursor ion [M + 2H](2+) (m/z 390) to product ion m/z 122 provided very high sensitivity. The method was validated with a lower limit of detection of 0.2 ng/mL with 0.1 mL of plasma, and the method was used to determine the plasma pharmacokinetics of vinorelbine in dogs.
authors.affiliation: Pharmaceutical Research Laboratories, Nippon Kayaku Co. Ltd., 3-31-12 Shimo, Kita-ku, Tokyo, Japan. makoto.niwa@nipponkayaku.co.jp
authors.forename: Makoto
authors.initials: M
authors.lastname: Niwa
authors.forename: Takashi
authors.initials: T
authors.lastname: Kawashiro
mesh_terms: D000327:Adsorption; D000818:Animals; D019540:Area Under Curve; D002853:Chromatography, Liquid / Q000379:methods*; D004285:Dogs; D004355:Drug Stability; D006863:Hydrogen-Ion Concentration; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D052616:Solid Phase Extraction; D021241:Spectrometry, Mass, Electrospray Ionization; D053719:Tandem Mass Spectrometry / Q000379:methods*; D014747:Vinblastine / Q000031:analogs & derivatives* / Q000097:blood / Q000493:pharmacokinetics; D000077235:Vinorelbine
chemical_list: D014747:Vinblastine; D000077235:Vinorelbine