Abstract
Two types of film structure are formed when liposomes are spread at the air/water interface. At zero surface pressure, there is a slow transformation of the closed bilayered structure into a lipid monolayer. The internal content of the liposomes is released into the aqueous subphase. In contrast, when multilamellar liposomes are spread against a surface pressure, they retain their internal content at the air/water interface by forming multilayered structures. Among the liposomes which dipped through the interface an important fraction loses its internal content. During the spreading process at zero surface pressure, it seems that the outer layer of the liposome spreads with a better yield as compared with the inner layer. It is possible to use this spreading technique to determine the asymmetrical distribution of lipids across bilayers.
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