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Change in enthalpy vs. molar ratio upon titration of G5 into various phospholipid SUVs at 50°C in PBS. The interaction of G5 and anionic lipids demonstrated significant heat release (ΔH < 0) and a specific saturating stoichiometry after which no dendrimer-lipid interaction was observed. ΔH0 = 0 ± 10 kJ/mol for the polycationic dendrimers and zwitterionic lipids. The polycationic polymer-cationic lipid interaction had only an initial endothermic interaction.
