β Scribed by S.A. Penkett; A.G. Flook; D. Chapman
No coin nor oath required. For personal study only.
Proton magnetic resonance (p.m.r.) line widths and relaxation times have been measured with phospholipid molecules in a variety of environments including coarse aqueous dispersions, sonicated aqueous dispersions, and dissolved in organic solvents. Comparative measurements have also been made on other lipid systems.
Broad lines (~10 z c/s) are observed when the phospholipids are present in a lamellar mesomorphic phase and in coarse aqueous dispersions. These line widths vary with the main magnetic field Ho. High resolution p.m.r, spectra are obtained when phospholipids are present in (a) a cubic mesomorphic phase, (b) a sonicated aqueous dispersion, and (c) organic solvents.
The p.m.r, data is interpreted to provide information about the motional characteristics of the phospholipids in these different environments.
π SIMILAR VOLUMES
DMR spectra have been studied with some lecithin--D~O systems. For low hydrations the quadrupole coupling constants are less than 3 KHz depending on the concentrations of the aqueous deuterons and the temperature. The reduction of the quadrupole coupling constant from 200 KHz characteristic of simp