title: Direct enrichment of tryptophan and its metabolites in plasma onto a pre-column followed by reverse phase HPLC analysis.
mesh_terms: D000818:Animals; D002851:Chromatography, High Pressure Liquid / Q000379:methods; D006801:Humans; D011817:Rabbits; D014364:Tryptophan / Q000097:blood*
chemical_list: D014364:Tryptophan