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• W1981012152 abstract "Membrane stability is of central concern in many biology and biotechnology processes. It has been suggested that intramembrane electrostatic interactions play a key role in membrane stability. However, due primarily to a lack of supporting experimental evidence, they are not commonly considered in mechanical analyses of lipid membranes. In this paper, we use the micropipette aspiration technique to characterize the elastic moduli and critical tensions of lipid vesicles with varying surface charge. Charge was induced by doping neutral phosphatidylcholine vesicles with anionic lipids phosphatidylglycerol and phosphatidic acid. Measurements were taken in potassium chloride (moderate ion-lipid binding) and tetramethylammonium chloride (low ion-lipid binding) solutions. We show that inclusion of anionic lipid does not appreciably alter the areal dilation elasticity of lipid vesicles. However, the tension required for vesicle rupture decreases with increasing anionic lipid fraction and is a function of electrolyte composition. Using vesicles with 30% charged (i.e., unbound) anionic lipid, we measured critical tension reductions of 75%, demonstrating the important role of electrostatic interactions in membrane stability." @default.
• W1981012152 created "2016-06-24" @default.
• W1981012152 creator A5048330548 @default.
• W1981012152 creator A5067125133 @default.
• W1981012152 date "2002-10-01" @default.
• W1981012152 modified "2023-09-27" @default.
• W1981012152 title "Intramembrane Electrostatic Interactions Destabilize Lipid Vesicles" @default.
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• W1981012152 doi "https://doi.org/10.1016/s0006-3495(02)73962-3" @default.
• W1981012152 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/1302290" @default.
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