Abstract
An amphipatic liposaccharide, β16, has been synthesized by condensation of the glycoamino acid β of ovomucoid with the palmitic acid to serve as a model on which the properties of the saccharide chains can be studied. This paper reports the ternary system β16/dipalmitoylphosphatidylcholine (DPPC)/water. Using X-ray diffraction and freeze-fracture electron microscopy, it was shown that the ternary system exhibits mesomorphic structures in the temperature range over which the aliphatic chains of the DPPC are in a liquid-like conformation. A phase diagram of the system was drawn at 75°C in terms of the water concentration and of the β16 content. As the molar fraction in β16 increases from about 0.08 to 1, the ternary system displays successively two lamellar structures analogous to that exhibited by the system DPPC/H 2O, then a hexagonal structure similar to that exhibited by the system β16/H 2O. The two types of lamellar structure were shown to differ by the T or Y conformation adopted by their saccharide chains.
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