Abstract
By comparing three phospholipids with different head groups, phosphatidylcholine (PC), phosphatidylethanolamine (PE) and phosphatidylglycerol (PG), the effect of the head group on the acyl-chain packing and structure of the lipid assembly was investigated by high sensitivity differential scanning calorimetry and negative stain electron microscopy. The surface curvatures of the three assemblies were revealed to increase in the order PE < PC < PG, that is, in the order of an increase in the areas of the head groups relative to the area of the acyl chains. In accordance with this difference, the acyl-chain packing in the gel phase also differed greatly among the three assemblies, which was reflected in thermotropic behavior such as a very broad peak, a high temperature for the gel to liquid crystal transition and lack of a pretransition.
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