title: Rapid quantification of conjugated and unconjugated bile acids and C27 precursors in dried blood spots and small volumes of serum.
abstract: The aim of the study was to develop a method for fast and reliable diagnosis of peroxisomal diseases and to facilitate differential diagnosis of cholestatic hepatopathy. For the quantification of bile acids and their conjugates as well as C(27) precursors di- and trihydroxycholestanoic acid (DHCA, THCA), in small pediatric blood samples we combined HPLC separation on a reverse-phase C18 column with ESI-MS/MS analysis in the negative ion mode. Analysis was done with good precision (CV 3,7%-11.1%) and sufficient sensitivity (LOQ: 11-91 nmol/L) without derivatization. Complete analysis of 17 free and conjugated bile acids from dried blood spots and 10 microL serum samples, respectively, was performed within 12 min. Measurement of conjugated primary bile acids plus DHCA and THCA as well as ursodeoxycholic acid was done in 4.5 min. In blood spots of healthy newborns, conjugated primary bile acids were found in the range of 0.01 to 2.01 micromol/L. Concentrations of C(27) precursors were below the detection limit in normal controls. DHCA and THCA were specifically elevated in cases of peroxysomal defects and one Zellweger patient.
authors.affiliation: Department of Pediatric Kidney-, Liver-Metabolic Diseases, Children's Hospital Hannover Medical School, Hannover, Germany.
authors.forename: N
authors.initials: N
authors.lastname: Janzen
authors.forename: S
authors.initials: S
authors.lastname: Sander
authors.forename: M
authors.initials: M
authors.lastname: Terhardt
authors.forename: A M
authors.initials: AM
authors.lastname: Das
authors.forename: J O
authors.initials: JO
authors.lastname: Sass
authors.forename: R
authors.initials: R
authors.lastname: Kraetzner
authors.forename: H
authors.initials: H
authors.lastname: Rosewich
authors.forename: H
authors.initials: H
authors.lastname: Rosevich
authors.forename: M
authors.initials: M
authors.lastname: Peter
authors.forename: J
authors.initials: J
authors.lastname: Sander
mesh_terms: D001647:Bile Acids and Salts / Q000097:blood* / Q000737:chemistry*; D001656:Biliary Atresia / Q000097:blood; D001774:Blood Chemical Analysis / Q000379:methods*; D001800:Blood Specimen Collection; D002244:Carbon / Q000737:chemistry*; D002853:Chromatography, Liquid; D005693:Galactosemias / Q000097:blood; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D016014:Linear Models; D018901:Peroxisomal Disorders / Q000097:blood; D044967:Serum / Q000737:chemistry*; D053719:Tandem Mass Spectrometry; D013997:Time Factors; D014580:Ursodeoxycholic Acid / Q000627:therapeutic use
chemical_list: D001647:Bile Acids and Salts; D014580:Ursodeoxycholic Acid; D002244:Carbon