The spin-spin proton relaxation times T2 of concentrated sucrose, maltose,D-glucose andL-proline solutions were determined using a Bruker Minispec NMR Spectrometer. Log spin echo amplitude decay curves were also determined and their non-linear nature allowed the proportions of different proton types to be calculated. These were in agreement with the theoretical proportions of ring (non-exchangeable protons), solute hydroxyl protons and water protons in the simple sugar molecules. A deuteration experiment confirmed that only non-exchangeable ring protons remained.

Concentrated sweet solutions contain only non-exchangeable ring protons, as determined by pulsed NMR analysis, in agreement with theoretical proportions.

Identification of proton type in concentrated sweet solutions by pulsed NMR analysis

Key Takeaway: Concentrated sweet solutions contain only non-exchangeable ring protons, as determined by pulsed NMR analysis, in agreement with theoretical proportions.