Phase transitions of phospholipids in monolayers and surface viscosity

✍ Scribed by Makoto Hayashi; Toshio Muramatsu; Ichiro Hara; Tsutomu Seimiya

• Publisher: Elsevier Science
• Year: 1975
• Tongue: English
• Weight: 291 KB
• Volume: 15
• Category: Article
• ISSN: 0009-3084
• DOI: 10.1016/0009-3084(75)90043-2

✦ Synopsis

The surface pressures and the surface viscosities of lecithin, cephalin and its analogs were measured at the air-water and the oil-water interfaces. It was found that the surface viscosity of the phospholipids used in this study was very high, and was comparable to those of some polymer films at the oil-water interface as well as at the air-water interface under the conditions where the monolayers were condensed. The plateaus indicating the phase transitions in monolayers were clearly observed on the pressure-area curves at the oil-water interface in all of the specimens studied. It was found that the phase transitions exactly corresponded to the abrupt increases in surface viscosity. From the results thus obtained, an intermolecular ionic linkage between neighboring molecules in the monolayers is discussed.