Fig. 4.
Functional dependence of relaxation times and order parameters from solid-state 2H NMR spectroscopy reveal dynamical bending rigidity of lipid membranes. Data are for unoriented lipid dispersions at 55.4 MHz and various temperatures (T ≥ Tm + 6 °C): a DLPC-d46, b DMPC-d54, c DPPC-d62, and d DSPC-d70, with acyl lengths of n = 12, 14, 16, and 18 carbons, respectively. Square-law functional relation of spin–lattice relaxation rates R1Z and order parameters |SCD| along the acyl chains (index i) for a homologous series of PCs in the Lα phase characterizes the influence of the acyl length (bilayer thickness). Adapted from Ref. (Brown et al. 2001)