Journal
FORENSIC SCIENCE INTERNATIONAL
Volume 149, Issue 2-3, Pages 171-179Publisher
ELSEVIER IRELAND LTD
DOI: 10.1016/j.forsciint.2004.05.017
Keywords
gamma-hydroxybutyric acid; endogenous level; diabetic; urine; gas chromatography-mass spectrometry; forensic toxicology
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Urinary endogenous concentrations of gamma-hydroxybutyric acid (GHB), alpha-hydroxybutyric acid (AHB) and beta-hydroxybutyric acid (BHB) have been investigated for both healthy humans and diabetics by using a newly optimized GC-MS procedure. The endogenous concentrations in healthy volunteers' urine ranged 0.16-2.14 mu g/ml for GHB, 0.10-2.68 mu g/ml for AHB and 8.51-34.7 mu g/ml for BHB. In diabetics, the concentrations ranged 0.17-3.03 mu g/ml for GHB, 0.14-124 mu g/ml for AHB and 4.94-4520 mu g/ml for BHB. Although notably elevated BHB and AHB concentrations were observed for severely uncontrolled diabetics, their GHB concentrations ranged within or near the range seen in healthy humans. The results of this study confirm the previously suggested 10 mu g/ml cutoff concentration of urinary GHB to distinguish exogenous GHB, even for uncontrolled diabetic patients suffering severe ketoacidosis. (c) 2004 Elsevier Ireland Ltd. All rights reserved.
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