title: Fluorimetric determination of kynurenine in human serum by high-performance liquid chromatography coupled with post-column photochemical reaction with hydrogen peroxide.
abstract: A high-performance liquid chromatographic method involving post-column photochemical reaction and fluorimetric detection has been developed for the determination of kynurenine in serum. Kynurenine was separated on a column of Capcell Pak C18 (resistant to pH 10). The mobile phase consisted of 0.05 M Na2B4O7-0.1 M KH2PO4 buffer (pH 8.5)-ethanol (97:3, v/v) containing 60 mM hydrogen peroxide. The post-column reagent, containing 60% (v/v) ethanol, was mixed with the mobile phase, which was irradiated with ultraviolet light to induce fluorescence. The recovery of kynurenine was 95.9 +/- 5.0% (n = 6). The method allows the determination of as little as 2 pmol of kynurenine.
authors.affiliation: Faculty of Pharmaceutical Sciences, Teikyo University, Kanagawa, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Mawatari
authors.forename: F
authors.initials: F
authors.lastname: Iinuma
authors.forename: M
authors.initials: M
authors.lastname: Watanabe
mesh_terms: D002851:Chromatography, High Pressure Liquid; D006801:Humans; D006861:Hydrogen Peroxide; D006863:Hydrogen-Ion Concentration; D007202:Indicators and Reagents; D007737:Kynurenine / Q000097:blood*; D010777:Photochemistry; D013050:Spectrometry, Fluorescence
chemical_list: D007202:Indicators and Reagents; D007737:Kynurenine; D006861:Hydrogen Peroxide