title: Quantification of carbamylated dehydroascorbate derivative produced from cyanate and dehydroascorbate.
abstract: We established a high-performance liquid chromatographic method for separating and quantifying carbamylated dehydroascorbate derivative (CDA), a reaction product of cyanate with dehydroascorbate. The separation of CDA from interfering substances was achieved by anion-exchange HPLC using a TSK gel SAX (250x4.6 mm I.D.) column and 0.12 M NaCl eluent. The detection of CDA was achieved through two steps: (1) degradation of CDA to cyanate and amino compounds in alkaline solution, and (2) detection of these products by an indophenol reaction. For the processing of plasma and urine samples, anion-exchange solid-phase extraction was used. The detection limit for quantitative determination was 0.1 microM CDA (S/N=3). The linear range found applying the optimized conditions was 0.2 to 200 microM. The intra- and inter-day assay precision (R.S.D.) of CDA (10 microM) were 4.8 and 7.2% for rat plasma, and 4.0 and 4.9% for rat urine, respectively. The usefulness of the present method was proved by the application to plasma and urine samples. The study of the biokinetics of CDA in rats revealed that the elimination of CDA is due to urinary excretion.
authors.affiliation: Faculty of Pharmaceutical Sciences, Chiba University, Japan.
authors.forename: I
authors.initials: I
authors.lastname: Koshiishi
authors.forename: T
authors.initials: T
authors.lastname: Imanari
mesh_terms: D000818:Animals; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D003485:Cyanates / Q000097:blood / Q000737:chemistry* / Q000652:urine; D003683:Dehydroascorbic Acid / Q000097:blood / Q000737:chemistry* / Q000652:urine; D008297:Male; D051381:Rats; D017208:Rats, Wistar
chemical_list: D003485:Cyanates; C048679:dehydroerythorbic acid; D003683:Dehydroascorbic Acid