title: Differentiated quantification of human bile acids in serum by high-performance liquid chromatography-tandem mass spectrometry.
abstract: Determination of quantitative changes in the pattern of serum bile acids is important for the monitoring of diseases affecting bile acid metabolism. A sensitive and specific high-performance liquid chromatography (HPLC)-MS/MS method was developed for the differentiated quantification of unconjugated as well as glycine- and taurine-conjugated cholic, chenodeoxycholic (CDCA), deoxycholic (DCA), ursodeoxycholic (UDCA) and lithocholic acid (LCA) in serum samples. After solid-phase extraction and reversed-phase HPLC separation, detection of the conjugated bile acids was performed using electrospray ionization (ESI)-MS/MS and selected reaction monitoring mode, whereas unconjugated bile acids were determined by ESI-MS and selected ion monitoring mode. The within-day and between-day coefficients of variation were below 7% for all bile acids and the recovery rates of the extraction procedure were between 84.9 and 105%. The developed method was applied to a group of 21 healthy volunteers and preliminary reference intervals in serum were established. In patients with drug-induced cholestasis, an elevation of primary bile acids has been shown.
authors.affiliation: Institute of Clinical Chemistry, University Hospital Zurich, Rämistrasse 100, CH-8091 Zurich, Switzerland.
authors.forename: Ines
authors.initials: I
authors.lastname: Burkard
authors.forename: Arnold
authors.initials: A
authors.lastname: von Eckardstein
authors.forename: Katharina M
authors.initials: KM
authors.lastname: Rentsch
mesh_terms: D000328:Adult; D001647:Bile Acids and Salts / Q000097:blood*; D002779:Cholestasis / Q000097:blood / Q000139:chemically induced; D002851:Chromatography, High Pressure Liquid / Q000295:instrumentation / Q000379:methods*; D005260:Female; D006801:Humans; D008297:Male; D013058:Mass Spectrometry / Q000379:methods*; D008875:Middle Aged; D012016:Reference Values; D015203:Reproducibility of Results
chemical_list: D001647:Bile Acids and Salts