Abstract
A 532 nm red pigment formed in the thiobarbituric acid (TBA) assay of human urine was characterized after separation of the pigment by high-performance liquid chromatography. The yield of the red pigment was some-what higher at pH 2 than at pH 5; its development was not inhibited by ethylenediaminetetraacetic acid. The characteristics of the pigment were similar to those of the pigment derived from standard malonaldehyde. The amount of the pigment formed was roughly equal to the content of malonaldehyde derivatives estimated as 1-(2,4-dinitrophenyl)pyrazole. Pigment formation was significantly enhanced byt-butyl hydroperoxide (t-BuOOH) and ferric ions, which may be due to pigment formed from aldehydes other than malonaldehyde; the presence of these aldehydes was confirmed by the formation of the corresponding 2,4-dinitrophenylhydrazones. The amount of pigment produced from 24-h urine samples of 12 healthy subjects was estimated to be 26–95 nmol/kg, and 65–182 nmol/kg in the presence oft-BuOOH. These values are lower than those for urine of rabbit or rat. The TBA reactivity in the absence and presence oft-BuOOH of human urine was not related to age or sex. The TBA reactivity of human urine collected in the afternoon and in the evening was higher than that of urine collected in the morning.
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Abbreviations
- BHT:
-
butylated hydroxytoluene
- DNPH:
-
2,4-dinitrophenylhydrazine
- DNPP:
-
1-(2,4-dinitrophenyl)pyrazole
- EDTA:
-
ethylenediaminetetraacetic
- HPLC:
-
high-performance liquid chromatography
- TBA:
-
thiobarbituric acid
- t-BuOOH:
-
tert-butyl hydroperoxide
- TMP:
-
tetramethoxypropane
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Kosugi, H., Kojima, T. & Kikugawa, K. Characteristics of the thiobarbituric acid reactivity of human urine as a possible consequence of lipid peroxidation. Lipids 28, 337–343 (1993). https://doi.org/10.1007/BF02536320
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DOI: https://doi.org/10.1007/BF02536320