3-O-Methyl-D-glucose mutarotation and proton exchange rates assessed by 13C, 1H NMR and by chemical exchange saturation transfer and spin lock measurements.
3-O-Methyl-D-glucose (3OMG) was recently suggested as an agent to image tumors using chemical exchange saturation transfer (CEST) MRI. To characterize the properties of 3OMG in solution, the anomeric equilibrium and the mutarotation rates of 3OMG were studied by 1H and 13C NMR. This information is essential in designing the in vivo CEST experiments. At room temperature, the ratio of α and β 3OMG anomers at equilibrium was 1:1.4, and the time to reach 95% equilibrium was 6 h. The chemical exchange rates between the hydroxyl protons of 3OMG and water, measured by CEST and spin lock at pH 6.14 and a temperature of 4 °C, were in the range of 360-670 s-1.
['Rivlin|Michal|M|', 'Navon|Gil|G|http://orcid.org/0000-0002-2187-1193']
D019325:3-O-Methylglucose D002247:Carbon Isotopes D002623:Chemistry Techniques, Analytical D008279:Magnetic Resonance Imaging D009682:Magnetic Resonance Spectroscopy D011522:Protons D013696:Temperature
3-O-Methyl-D-glucose (3OMG) Chemical exchange saturation transfer (CEST) Anomeric equilibrium Mutarotation kinetics NMR spectroscopy Spin lock (SL)