Phosphorus-31 studies on lecithin in ethanol solutions.
31P relaxation times of lecithin in ethanol solutions have been measured in dependence on temperature and water concentration. Trial calculations have been carried out on the assumption of a 2-site exchange model. The results suggest first, the relaxation behaviour is determined by various motional and exchange processes; second, at 29 MHz the dipole-dipole interaction between 31P and protons provides the dominant contribution; third, in general we are not concerned with the case of "extreme narrowing". Morover, there are no negligible intermolecular contributions to relaxation.
D002151:Calorimetry; D004578:Electron Spin Resonance Spectroscopy; D000431:Ethanol; D008968:Molecular Conformation; D010713:Phosphatidylcholines; D010759:Phosphorus Isotopes; D013816:Thermodynamics
D010713:Phosphatidylcholines; D010759:Phosphorus Isotopes; D000431:Ethanol