Abstract
Sonicated liposomes of dipalmitoyl phosphatidylcholine show sharp turbidity changes on heating at two distinct temperatures. A decrease in turbidity at the lower temperature (approx. 37°C) is thought to be associated with the phase transition of small vesicles and a decrease at about 44°C with larger vesicles or multilayer. An increase of turbidity between 38 and 43°C is attributed to the fusion of small vesicles. The turbidity changes were studied under various modes of vesicle preparation to confirm the interpretation of the turbidity data. Alternate interpretations are discussed.
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