Abstract
AbstractDipalmitoylphosphatidylcholine (DPPC)‐polyglycine and dimyristoylphosphatidylcholine (DMPC)‐polyglycine systems have been studied by Raman spectroscopy and differential scanning calorimetry. The results of both techniques indicate that the interactions are confined to the lipid‐water interface. Some penetration is observed in DMPC systems. The presence of cholesterol does not change the surface character of the interaction of the lipids with polyglycine molecules. Because of the similarity of the behaviour of the two lipids, DMPC can be used instead of DPPC in studies with artificial membranes. DMPC has the advantage of a lower Tm. Since lipid‐water interactions define the conformational state of extrinsic proteins and consequently their biological behaviour, these surface interactions could be a first approach to an understanding of the mechanism of processes such as the immunological response.
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