title: Automated metabolic profiling of organic acids in human urine. I. Description of methods.
abstract: We describe a complete procedure for separation and mechanized analysis of organic acids in human urine. The acid fraction of urine is separated by anion-exchange chromatography on diethylaminoethyl-Sephadex. Individual acids are identified and measured by use of a gas-chromatography/mass spectrometer/computer system that can clearly distinguish contributions from at least 150 substances in a single sample. We discuss analytical recoveries, contributions from the sample separation process, stability of stored samples before and after processing, and reproducibility of the extraction procedure.
mesh_terms: D001322:Autoanalysis / Q000379:methods; D002264:Carboxylic Acids / Q000302:isolation & purification / Q000652:urine*; D002849:Chromatography, Gas; D002852:Chromatography, Ion Exchange / Q000379:methods; D004355:Drug Stability; D006801:Humans; D013058:Mass Spectrometry; D013048:Specimen Handling
chemical_list: D002264:Carboxylic Acids