title: Quantification of urinary 5-aminolevulinic acid by gas chromatography-mass spectrometry.
abstract: In this report, we describe a method for the specific quantification of urinary 5-aminolevulinic acid. It is based on gas chromatographic mass spectrometric measurement of the trimethylsilyl ester of the ethylacetoacetate pyrrole derivative of 5-aminolevulinic acid. Selected ion monitoring (SIM) was used for quantification using 3-hydroxymyristic acid as an internal standard. The detection limit of this method was 0.1 nmol/ml. This method was applied to the determination of urinary 5-aminolevulinic acid from a tyrosinemia type I patient and normal subjects, and 21.4 mmol/mol creatinine and 0.54+/- 0.49 mmol/mol creatinine (n = 7), respectively, were detected. Less than 0.2 ml urine was sufficient for the determination of 5-aminolevulinic acid in healthy subjects.
authors.affiliation: Division of Human Genetics, Medical Research Institute, Kanazawa Medical University, 1-1 Daigaku, Uchinada, Kahoku-gun, Ishikawa 920-0293, Japan. shinka@kanazawa-med.ac.jp
authors.forename: Toshihiro
authors.initials: T
authors.lastname: Shinka
authors.forename: Tomiko
authors.initials: T
authors.lastname: Kuhara
mesh_terms: D000622:Aminolevulinic Acid / Q000652:urine*; D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods*; D006801:Humans; D012015:Reference Standards; D020176:Tyrosinemias / Q000652:urine
chemical_list: D000622:Aminolevulinic Acid