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- W1972080503 abstract "Ammonium is an important intermediate of protein metabolism and is a key component of acid-base balance. Investigations of the metabolism of NH(4)(+) in vivo using isotopic techniques are difficult because of the low concentration of NH(4)(+) in biological fluids and because of frequent artifactual isotopic dilution of the enrichment of NH(4)(+) during the assay. A new gas chromatographic mass spectrometric method was designed to monitor the (15)N enrichment and concentration of NH(4)(+) in vivo. These are both calculated from the mass isotopomer distribution of hexamethylenetetramine (HMT) formed by reacting NH(4)(+) with formaldehyde. The enrichment of NH(4)(+) is amplified four times since the HMT molecule contains four atoms of nitrogen derived from NH(4)(+). This allows the measurement of low (15)N enrichment of NH(4)(+), down to 0.1%. (15)N enrichment of urea and of the amide N of L-glutamine are measured by enzymatic release of NH(4)(+) and conversion of the latter to HMT. These new techniques facilitate in vivo investigations of the metabolism of NH(4)(+) and related compounds." @default.
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- W1972080503 date "1999-11-01" @default.
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- W1972080503 title "15N enrichment of ammonium, glutamine-amide and urea, measured via mass isotopomer analysis of hexamethylenetetramine" @default.
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- W1972080503 doi "https://doi.org/10.1002/(sici)1096-9888(199911)34:11<1130::aid-jms871>3.0.co;2-y" @default.
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