A scanning calorimetric study of small molecule-lipid bilayer mixtures.

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Abstract
The influence of small molecules on the main phase transition of dimyristoyl phosphatidylcholine was observed by high-sensitivity differential scanning calorimetry. The variation with temperature of the excess heat capacity is markedly affected by solid solution formation, which appears to be of frequent occurrence in solutions in lipid bilayers. The experimental results are in some cases in reasonable agreement with ideal solution theory.