Fig. 3.

Ordering in sterol–phospholipid binary mixtures. (A) The fraction of phospholipid (DPPC) in complex form (order parameter f) in a binary mixture, calculated using the equilibrium constant derived from the phase diagram for the ternary mixture in Fig. 1. (B) First moments for deuterium NMR spectra of sterol–DPPC mixtures. The data points for E–DPPC mixtures are taken from ref. 14. The curve is calculated assuming that the first moment is a linear function of f, using the experimental values of M₁ at 0.0 and 0.35 mol fraction E for calibration (see text). Note that the data points refer to E–DPPC binary mixtures, whereas the curve is calculated for a C–DPPC binary mixture.