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- W1995804924 abstract "To allow in vivo determination of synthetic rates for individual proteins, physiological incorporation of infused [15N]glycine into urinary hippuric acid has been used as an indicator of intrahepatic tracer dilution. Although the kidneys might contribute to hippurate production, the relationship between hepatic, plasma, and urinary hippurate has not yet been established in humans. To further investigate these issues we developed a fast, sensitive, and reliable method for measuring simultaneously hippurate concentrations and in vivo tracer incorporation into hippurate in plasma and urine using stable isotopes and gas chromatography-mass spectrometry. We then tested this assay under several experimental conditions. Reference compounds [( 15N]- and [ring-2H5]hippurate) were synthesized and gave linear standard curves. Postabsorptive hippurate plasma levels in healthy subjects ranged from 1.2 to 10.5 microM and protein binding was 79 +/- 6% (mean +/- SD). Following a bolus dose of [15N]glycine tracer appeared in plasma hippurate; enrichment in hippurate was indistinguishable from that in glycine after an equilibration period of 20 min, indicating a close relationship between intracellular glycine and plasma hippurate. A 16-h infusion of [15N]glycine resulted in identical enrichment levels in urinary and plasma hippurate; glycine enrichment in a hepatic export protein (VLDL-ApoB) was approaching plasma hippurate but not plasma free glycine enrichment. The ability to monitor plasma hippurate is of practical advantage compared to the sampling of urine. Furthermore it allows the monitoring of rapid events in the intrahepatic dilution of an infused glycine tracer. This assay may, therefore, become an important tool in the study of hepatic protein metabolism." @default.
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- W1995804924 date "1990-12-01" @default.
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- W1995804924 title "Analysis of plasma hippurate in humans using gas chromatography-mass spectrometry: Concentration and incorporation of infused [15N]glycine" @default.
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- W1995804924 doi "https://doi.org/10.1016/0003-2697(90)90239-6" @default.
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