Novel structural features of the ripple phase of phospholipids
Raman Research Institute - Bangalore, 560 080, India
2 National Research Council, Steacie Institute of Molecular Sciences Chalk River Laboratories - Chalk River, Ontario K0J 1J0, Canada
Accepted: 13 January 2000
We have calculated, from X-ray diffraction data, the electron density maps of the ripple phase of dimyristoylphosphatidylcholine (DMPC) and palmitoyl-oleoyl phosphatidylcholine (POPC) multibilayers at different temperatures and fixed relative humidity. Our ana lysis of the maps establishes the existence of an average tilt of the hydrocarbon chains of the lipid molecules along the direction of the ripple wave vector, which we believe is responsible for the occurrence of asymmetric ripples in these systems.
PACS: 61.10.Eq – X-ray scattering (including small-angle scattering) / 61.30.Eb – Experimental determinations of smectic, nematic, cholesteric, and other structures
© EDP Sciences, 2000