title: High-performance liquid chromatographic analyses of hydroxymonocarboxylic acids and dicarboxylic acids in urine as their 2-nitrophenylhydrazides.
abstract: Both hydroxymonocarboxylic acids and dicarboxylic acids in urine were converted into their 2-nitrophenylhydrazides without lengthy and cumbersome sample workup and were separated from each other by two-step extraction with diethyl ether at different pH values. HPLC analysis of each acid group was achieved isocratically within 30 min. By the use of a visible-range detector (400 nm) the detection limits ranged from 1 to 2 pmol and from 2 to 5 pmol per injection for the hydroxymonocarboxylic acids and dicarboxylic acids, respectively. The analytical results showed good recovery and reproducibility. Analysis profiles of the two acid groups in normal and diabetic subjects could be performed with 200 microliters of urine. The present method is superior over previously published methods because of its great simplicity and its time-, cost-, and labor-saving nature.
authors.affiliation: Faculty of Pharmaceutical Sciences, Fukuoka University, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Miwa
authors.forename: M
authors.initials: M
authors.lastname: Yamamoto
authors.forename: T
authors.initials: T
authors.lastname: Asano
mesh_terms: D055598:Chemical Phenomena; D002621:Chemistry; D002851:Chromatography, High Pressure Liquid; D003924:Diabetes Mellitus, Type 2 / Q000652:urine; D003998:Dicarboxylic Acids / Q000652:urine*; D005022:Ethyldimethylaminopropyl Carbodiimide; D006801:Humans; D006834:Hydrazines / Q000032:analysis*; D006880:Hydroxy Acids / Q000652:urine*; D008722:Methods; D010659:Phenylhydrazines; D015203:Reproducibility of Results
chemical_list: D003998:Dicarboxylic Acids; D006834:Hydrazines; D006880:Hydroxy Acids; D010659:Phenylhydrazines; C060574:2-nitrophenylhydrazine; D005022:Ethyldimethylaminopropyl Carbodiimide