Abstract
Using axisymmetric drop shape analysis as a film balance, the surface properties of a dipalmitoylphosphatidylcholine monolayer at the air-water interface were investigated. In particular, the controversial liquid-expanded/liquid-condensed (LE/LC) phase transition of the surface pressure-surface area isotherm was examined. The results indicate that the manifestation of this transition is dependent on the method used to form the monolayer. A ‘surface deposition’ method results in a high concentration of lipid at the interface, and compression of this type of monolayer produces the LE/LC transition. When the monolayer is formed using ‘bulk deposition,’ this transition does not occur. The proposed process of lipid arrangement for this type of monolayer is gaseous phase (G), G (or LE)-LC-solid phase (SC), and SC. Hence the LC phase is present throughout the middle region of the isotherm.
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