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• W2078973851 abstract "Measurements of urine galactitol have been used to monitor the adequacy of diet therapy in the treatment of galactosemia. We have devised a gas chromatographic mass spectrometry (GC/MS) isotope-dilution method for the simultaneous quantification of urine galactitol and another alternate pathway product, galactonate. We prepared trimethylsilyl (TMS) derivatives and used d-[UL-13C]galactitol and d-[UL-13C]galactonate as the internal standard for GC/MS. Results obtained with this method were compared with those determined by the established GC method for galactitol and the NMR method for galactonate. Thirty-three normal urine specimens were analyzed by the isotope dilution technique for galactitol and galactonate. Results of galactitol in 6 of these urine specimens along with 18 from classic galactosemics and 19 variant galactosemics were compared with the established GC method. Results for galactonate in 15 urine specimens from galactosemics were compared to the established NMR technique. The method was linear up to 200 nmol with lower limits of detection of 1.1 nmol (1.75 mmol/mol creatinine) (Cr) and 0.8 nmol (1.28 mmol/mol Cr) for galactitol and galactonate, respectively. Intra- and Interassay imprecision ranged from 2.1–6.7% for galactitol and 3.5–8.0% for galactonate. The excretion of both metabolites was age dependent in both normal and galactosemics. In 12 normal urines from subjects under 1 year, values for galactitol ranged from 8–107 mmol/mol Cr, and in 7 over age 6, ranged from 2–5 mmol/mol Cr. Under 1 year, the range for galactonate was non-detectable to 231 and in the over 6 years group non-detectable to 25 mmol/mol Cr. In galactosemics under 1 year, the value for galactitol ranged from 397–743 and for galactonate 92–132 mmol/mol Cr while in nine patients over age 6 the range was 125–274 mmol/mol Cr for galactitol and 17–46 mmol/mol Cr for galactonate. The GC/MS method enables the simultaneous determination of urine galactitol and galactonate and is precise and useful over the wide range of concentrations needed to assess the galactose burden in patients with galactosemia." @default.
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• W2078973851 date "2006-04-01" @default.
• W2078973851 modified "2023-10-13" @default.
• W2078973851 title "Urinary galactitol and galactonate quantified by isotope-dilution gas chromatography-mass spectrometry" @default.
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• W2078973851 doi "https://doi.org/10.1016/j.cca.2005.10.015" @default.
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