NMR and calorimetric studies of changes in phase transition of head group modified phospholipids.
The 13C- and 31P-NMR spectra and DSC thermograms of unsonicated dispersions consisting of phospholipids of varying methylation stages of the propanolamine head group were investigated. Methylation of the head group was accompanied by a corresponding reduction in the phase transition temperatures. In the liquid crystalline state the 31P-anisotropy of the chemical shift is about equal for all studied compounds, demonstrating that the motion of the phosphate group is not influenced by modifications of the propanolamine group.
D002151:Calorimetry; D055598:Chemical Phenomena; D002621:Chemistry; D009682:Magnetic Resonance Spectroscopy; D008745:Methylation; D010743:Phospholipids; D011412:Propanolamines; D013696:Temperature
D010743:Phospholipids; D011412:Propanolamines