High-performance liquid chromatographic
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Hiroshi Miwa; Magobei Yamamoto; Takashi Asano
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Article
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1990
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Elsevier Science
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English
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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 ac