title: Narrow-bore sample trapping and chromatography combined with quadrupole/time-of-flight mass spectrometry for ultra-sensitive identification of in vivo and in vitro metabolites.
abstract: The identification of in vitro and in vivo metabolites is vital to the discovery and development of new pharmaceutical therapies. Analytical strategies to identify metabolites at different stages of this process vary, but all involve the use of liquid chromatography separations combined with detection via mass spectrometry (HPLC/MS). Reported here is the use of narrow-bore column (0.5-1.0 mm i.d.) trapping of metabolites, followed by back-flushing onto a matching analytical column. Separated metabolites were then identified using quadrupole time-of-flight mass spectrometry (MS) and tandem MS. Metabolites in human plasma and from low-level in vitro incubations, that were not identified using standard HPLC/MS approaches, were characterized using the instrumental configuration described here.
authors.affiliation: Procter & Gamble Pharmaceuticals, Health Care Research Center, 8700 Mason-Montgomery Road, Mason, OH 45040-8006, USA.
authors.forename: David J
authors.initials: DJ
authors.lastname: Foltz
authors.forename: Jose
authors.initials: J
authors.lastname: Castro-Perez
authors.forename: Pamela
authors.initials: P
authors.lastname: Riley
authors.forename: John R
authors.initials: JR
authors.lastname: Entwisle
authors.forename: Timothy R
authors.initials: TR
authors.lastname: Baker
mesh_terms: D002851:Chromatography, High Pressure Liquid / Q000295:instrumentation / Q000379:methods*; D006801:Humans; D013058:Mass Spectrometry / Q000379:methods*; D004364:Pharmaceutical Preparations / Q000097:blood / Q000378:metabolism*; D012680:Sensitivity and Specificity
chemical_list: D004364:Pharmaceutical Preparations