Deuteron spectroscopy and deuteron field-cycling nuclear magnetic resonance relaxometry of the hydration water of lipid bilayers: The corrugated-sheet model for interface molecular dynamics in the ripple phase
Ro. Seitter et al., Deuteron spectroscopy and deuteron field-cycling nuclear magnetic resonance relaxometry of the hydration water of lipid bilayers: The corrugated-sheet model for interface molecular dynamics in the ripple phase, J CHEM PHYS, 112(19), 2000, pp. 8715-8722
Lipid bilayers are known to form the so-called ripple phase in a certain te
mperature interval between the gel and the liquid crystalline phase transit
ions. The dynamics of heavy water at the corrugated water/lipid interface w
as studied with the aid of field-cycling nuclear magnetic resonance (NMR) r
elaxometry and NMR spectroscopy of the water deuterons. Based on the "reori
entation mediated by translational displacement" relaxation mechanism, mode
l calculations were carried out. It is shown that the features of the spin-
lattice relaxation dispersion and the coalescence of the deuteron quadrupol
e splitting in the ripple phase commonly are a consequence of the geometric
al surface topology. The deuteron splitting and T-1 dispersion data for the
ripple phase can be explained in complete accordance with the results of f
reeze etching electron microscopy and tunneling microscopy. That is, the st
ructural surface features are mirrored in the reorientational dynamics of h
ydration water. (C) 2000 American Institute of Physics. [S0021- 9606(00)511
18-0].