Abstract
The compression/expansion properties of monolayers of dimyristoylphosphatidylcholine (DMPC), dipalmitoylphosphatidylcholine (DPPC) and distearoylphosphatidylcholine (DSPC) mixed with β-casein at the water|air interface are investigated by the film balance technique. An increase of the area per lipid molecule at constant surface pressure was found as the result of the incorporation of protein molecules into the lipid monolayers. When the films are compressed to a sufficiently high surface pressure the isotherms of the mixed protein–lipid monolayers coincide with those of pure lipid monolayers; i.e. the protein is “squeezed out”. Quantitative recording of consecutive cyclic compressions/expansions reveals that the processes in the mixed monolayers are reversible. The analysis suggests phase separation between protein and lipid.
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