title: Determination of underivatised sterols and bile acid trimethyl silyl ether methyl esters by gas chromatography-mass spectrometry-single ion monitoring in faeces.
abstract: A method for quantification of total faecal sterols and bile acids (BAs) in human stool by using gas chromatography-mass spectrometry-single ion monitoring (GC-MS-SIM) is described. Cholesterol, coprostanol, coprostanone, cholestanol, iso-lithocholic acid (iso-LCA), lithocholic acid (LCA), iso-deoxycholic acid (iso-DCA), deoxycholic acid (DCA), chenodeoxycholic acid (CDCA), cholic acid (CA), and 12-oxo-deoxycholic acid (12-oxo-DCA) in faeces of 86 healthy subjects were determined. The sample preparation for sterol analysis requires hydrolysis and liquid extraction from matrix, but no derivatisation. The GC-flame ionisation detection (FID) and total ion current (TIC) in GC-MS were not sufficient for sterol and BA determination, whereas selectivity and specificity of the GC-MS-SIM ensured the analysis of sterols and BAs in faeces.
authors.affiliation: Friedrich Schiller University, Institute of Nutrition, Dornburger Str. 24, 07743 Jena, Germany.
authors.forename: Sylvia
authors.initials: S
authors.lastname: Keller
authors.forename: Gerhard
authors.initials: G
authors.lastname: Jahreis
mesh_terms: D001647:Bile Acids and Salts / Q000032:analysis* / Q000737:chemistry; D002138:Calibration; D004952:Esters / Q000032:analysis; D005243:Feces / Q000737:chemistry*; D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods*; D015203:Reproducibility of Results; D013261:Sterols / Q000032:analysis*
chemical_list: D001647:Bile Acids and Salts; D004952:Esters; D013261:Sterols