title: Quantitative determination of peptide drug in human plasma samples at low pg/ml levels using coupled column liquid chromatography-tandem mass spectrometry.
abstract: Plasma concentrations after administration of peptide drugs are often low due to the high potency often seen with this class of compounds. In this work a bioanalytical method based on coupled column liquid chromatography-tandem mass spectrometry (LC-MS/MS) is presented for quantification of a peptide drug, FE 202158, under clinical development. A volume of 0.5 ml human plasma is solid phase extracted on a weak cationic exchanger. After evaporation of the solvent to dryness, the reconstituted sample is injected into a coupled column liquid chromatography system. A heart-cut from the initial column, a cyano column, is trapped on a C(4) column and thereafter injected into a microbore C(18) column. For the detection a triple quadrupole mass spectrometer, equipped with a TurboIonSpray interface working in positive ion mode, is used. The design of the system is described and the gain in sensitivity and selectivity, compared to a conventional system, is discussed. Data from validation of the bioanalytical method are presented. For human plasma samples a lower limit of quantification (LLOQ) of 5.00 pg/ml (=4.77 pmol/l) was achieved. The inter-assay precision was less than 11% and bias was within +/-4% over the whole validated range of 5.00-860 pg/ml.
authors.affiliation: Department of Bioanalysis, Experimental Medicine & Bioanalysis, Clinical & Non-Clinical R & D, Ferring Pharmaceuticals A/S, Kay Fiskers Plads 11, 2300 Copenhagen S, Denmark. ulf.lovgren@ferring.com
authors.forename: Ulf
authors.initials: U
authors.lastname: Lövgren
authors.forename: Sara
authors.initials: S
authors.lastname: Johansson
authors.forename: Lasse Skov
authors.initials: LS
authors.lastname: Jensen
authors.forename: Carina
authors.initials: C
authors.lastname: Ekström
authors.forename: Alf
authors.initials: A
authors.lastname: Carlshaf
mesh_terms: D002853:Chromatography, Liquid / Q000379:methods*; D006801:Humans; D010455:Peptides / Q000097:blood*; D004364:Pharmaceutical Preparations / Q000097:blood*; D012680:Sensitivity and Specificity; D052616:Solid Phase Extraction; D053719:Tandem Mass Spectrometry / Q000379:methods*
chemical_list: D010455:Peptides; D004364:Pharmaceutical Preparations