1H NMR determination of urinary betaine in patients with premature vascular disease and mild homocysteinemia
1995 (English)In: Clinical Chemistry, ISSN 0009-9147, E-ISSN 1530-8561, Vol. 41, no 2, 275-283 p.Article in journal (Refereed) Published
Urinary N,N,N-trimethylglycine (betaine) and N,N-dimethylglycine (DMG) have been identified and quantified for clinical purposes by proton nuclear magnetic resonance (1H NMR) measurement in previous studies. We have assessed these procedures by using both one-dimensional (1-D) and 2-D NMR spectroscopy, together with pH titration of urinary extracts to help assign 1H NMR spectral peaks. The betaine calibration curve linearity was excellent (r = 0.997, P = 0.0001) over the concentration range 0.2-1.2 mmol/L, and CVs for replicate betaine analyses ranged from 7% (n = 10) at the lowest concentration to 1% (n = 9) at the highest. The detection limit for betaine was < 15 mumol/L. Urinary DMG concentrations were substantially lower than those of betaine. Urinary betaine and DMG concentrations measured by 1H NMR spectroscopy from 13 patients with premature vascular disease and 17 normal controls provided clinically pertinent data. We conclude that 1H NMR provides unique advantages as a research tool for determination of urinary betaine and DMG concentrations.
Place, publisher, year, edition, pages
1995. Vol. 41, no 2, 275-283 p.
Adult, Amino Acid Metabolism, Inborn Errors/urine, Betaine/*urine, Creatinine/urine, Glycine/urine, Homocysteine/*blood, Humans, Hydrogen-Ion Concentration, *Magnetic Resonance Spectroscopy, Male, Regression Analysis, Sarcosine/analogs & derivatives/urine, Vascular Diseases/*urine
Physical Chemistry Chemical Sciences
IdentifiersURN: urn:nbn:se:liu:diva-114156PubMedID: 7533065OAI: oai:DiVA.org:liu-114156DiVA: diva2:790546
0009-9147 (Print) Journal Article Research Support, Non-U.S. Gov't2015-02-252015-02-112015-03-05Bibliographically approved