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Stable isotope dilution analysis of 4‐hydroxybutyric acid: An accurate method for quantification in physiological fluids and the prenatal diagnosis of 4‐hydroxybutyric aciduria
Author(s) -
Gibson K. M.,
Aramaki S.,
Sweetman L.,
Nyhan W. L.,
DeVivo D. C.,
Hodson A. K.,
Jakobs C.
Publication year - 1990
Publication title -
biomedical and environmental mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.475
H-Index - 121
eISSN - 1096-9888
pISSN - 0887-6134
DOI - 10.1002/bms.1200190207
Subject(s) - amniotic fluid , chromatography , chemistry , isotope dilution , urine , gas chromatography–mass spectrometry , fetus , mass spectrometry , biochemistry , pregnancy , biology , genetics
A quantitative assay for 4‐hydroxybutyric acid was developed using D 6 ‐4‐hydroxybutyric acid as an internal standard. 4‐Hydroxybutyric acid was isolated by liquid chromatography and the amount quantified by selected ion monitoring, ammonia chemical ionization gas chromatography/mass spectrometry of the trimethylsilyl derivatives. The concentrations of 4‐hydroxybutyric in control physiological fluids were: 2.64 ± 3.46 mmol mol −1 creatinine in urine, 1.09 ± 2.87 μmol l −1 in plasma, 0.98 ± 1.17 μmol l −1 in cerebrospinal fluid and 1.28 ± 0.47 μmol l −1 in amniotic fluid. The concentration of 4‐hydroxybutyric acid in the amniotic fluid from a pregnancy at risk for 4‐hydroxybutyric aciduria was 2.30 μmol l −1 , indicating an unaffected fetus. The stable isotope dilution assay of 4‐hydroxybutyric acid in physiological fluid samples is a rapid, sensitive and accurate method for quantification, as well as a valuable technique for the prenatal diagnosis of 4‐hydroxybutyric aciduria.