Abstract
The addition of dimyristoyl phosphatidylcholine (DMPC) to aqueous dimethylalkylphosphine oxide solutions decreases the concentration of surfactant required to reach the temperature at which phase separation occurs (cloud point). The cloud point was shown to depend on the mole fraction of surfactant to phospholipid present. The solution below the cloud point contains mixed micelles which may increase in size as the temperature is raised faster than surfactant micelles without phospholipid. The stability of the cloud phase was found to depend upon the amount of phospholipid added. Solutions which were rich in phospholipid and held above the cloud point, produced multilamellar structures that eventually precipitated from a clear monomeric surfactant solution. The possible significance of an abrupt phase inversion from a multilamellar to mixed micellar state for biological membranes was discussed.
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