title: Separation of 5-hydroxyindole-3-acetic acid and indole-3-acetic acid in urine by direct injection on a reversed-phase column containing a hydrogen-accepting stationary phase.
abstract: The separation of 5-hydroxyindole-3-acetic acid and indole-3-acetic acid from urine is demonstrated. The urine is injected directly on a liquid chromatographic column which is coupled to a flow-through fluorescence detector or a UV detector. A hydrogen-accepting stationary phase, tributyl phosphate (TBP), which retains carboxylic acid selectivity, was more selective than more common reversed-phase systems with alkyl-bonded stationary phases. The mobile phases were buffers, sometimes buffers containing methanol or acetonitrile. A simple method of removing late peaks in the chromatogram, in order to reduce analysis time, is also presented.
mesh_terms: D002853:Chromatography, Liquid / Q000379:methods*; D006801:Humans; D006897:Hydroxyindoleacetic Acid / Q000652:urine*; D007210:Indoleacetic Acids / Q000652:urine*
chemical_list: D007210:Indoleacetic Acids; D006897:Hydroxyindoleacetic Acid