title: Elimination of autosampler carryover in a bioanalytical HPLC-MS/MS method: a case study.
abstract: A case study in identifying and eliminating the source of autosampler carryover in a bioanalytical HPLC-MS/MS assay is described. Through a series of systematic experiments, the carryover was traced to the injection valve and was eliminated by switching from a partial loop to a full loop injection, which provided more effective flushing of the sample flow path. The susceptibility of the HPLC system to carryover was demonstrated to depend on the absolute sensitivity of the detection method and the mass of analyte injected at the assay lower limit of quantitation (LLOQ).
authors.affiliation: Merck Research Laboratories, Department of Drug Metabolism, Mail Stop, WP 75-200, West Point, PA 19486, USA. patrick_vallano@merck.com
authors.forename: P T
authors.initials: PT
authors.lastname: Vallano
authors.forename: S B
authors.initials: SB
authors.lastname: Shugarts
authors.forename: E J
authors.initials: EJ
authors.lastname: Woolf
authors.forename: B K
authors.initials: BK
authors.lastname: Matuszewski
mesh_terms: D002626:Chemistry, Pharmaceutical / Q000379:methods* / Q000592:standards*; D002851:Chromatography, High Pressure Liquid / Q000379:methods / Q000592:standards; D006801:Humans; D013058:Mass Spectrometry / Q000379:methods / Q000592:standards; D004364:Pharmaceutical Preparations / Q000097:blood / Q000737:chemistry
chemical_list: D004364:Pharmaceutical Preparations