Abstract
MANY experiments have been carried out with monolayer films of lecithin1,2, but reports of them do not fully describe the details of phospholipid preparations. On the other hand, three-dimensional liquid crystal phases of mixtures of phospholipids and water have been studied in detail3,4, and it has been shown that the phases are greatly influenced by the freshness of lecithin and also of the phospholipids. Aged phospholipids are not able to form liquid crystals. The electrical resistance of the fresh phospholipid bilayer at the water–water interface decreases rapidly 30 min after spreading the films in the presence of oxygen5. Our monolayer films of lecithin were also influenced by the degree of freshness of the lecithin.
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