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pubmed-article:10701079pubmed:abstractTextInteraction of lasalocid sodium salt (Las-Na) with dipalmitoylphosphatidylcholine (DPPC) as a membrane model was investigated by highly-sensitive differential scanning calorimetry (DSC). The insertion properties of the antibiotic were studied both in multilamellar suspensions and unilamellar vesicles, for Las-Na/DPPC molar ratios (r) ranging from 0.005 to 0.1. The effect of the antibiotic on the lipid thermotropic behavior is concentration dependent and drastically changes at a critical r of 0.04 in both model membranes. Below this ratio, Las-Na molecules interact with DPPC bilayers without disrupting the global organization of the membrane. In the multilamellar systems only the transition cooperativity is affected whereas for the mixed vesicles, a decrease in the enthalpy change suggests a different mode of insertion. Above this ratio, implantation of the antibiotic give rise to lateral phase separation in multilamellar systems. These structural modifications have repercussions on the formation of mixed LAS-Na/DPPC vesicles which seems limited to an r value of 0.04.lld:pubmed
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pubmed-article:10701079pubmed:dateRevised2003-11-14lld:pubmed
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pubmed-article:10701079pubmed:articleTitleA differential scanning calorimetry study of the interaction of lasalocid antibiotic with phospholipid bilayers.lld:pubmed
pubmed-article:10701079pubmed:affiliationGroupe de Recherche en Physique et Biophysique, Université René Descartes-Paris V, France. betrenco@citi2.frlld:pubmed
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