The 1-Monooleoyl-rac-glycerol/n-Octyl-β- d -Glucoside/Water System. Phase Diagram and Phase Structures Determined by NMR and X-ray Diffraction

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Using SAXD and NMR techniques as well as visual observations, a detailed study of the extension of the phase regions and their structures has been performed for the ternary system 1-monooleoyl- rac -glycerol (MO)/ n -octyl-β- d -glucopyranoside (OG)/ 2 H 2 O at 25 °C. OG in water forms a large region of a micellar solution phase, in which substantial amounts of MO can be dissolved. Increasing the MO concentration at constant water content results in the formation of two- and three-phase areas, consisting of liquid, lamellar, or cubic phases in equilibrium with a very dilute water/OG solution. Besides the different phases previously reported for the binary systems, an additional hexagonal phase occurs at high OG contents. Addition of minor amounts (≈1.5 wt %) of OG converts the cubic phases present in the MO/ 2 H 2 O system to an L α phase, while the cubic phase in the OG/ 2 H 2 O system is able to dissolve as much as 15 wt % MO. Since a major part of the phase diagram consists of planar bilayers, it is concluded that for most MO/OG ratios the spontaneous curvature is close to zero. The reason for this is discussed in terms of the molecular packing of MO and OG.