Abstract
Abstract The interaction of monovalent ions and the dipalmitoyl phosphatidylcholine (DPPC) bilayer was studied using differential scanning calorimetry (DSC). Phase transition temperatures, enthalpies and entropies were determined as function of the ion-millieu. Separate attention was given to the role of cations and that of anions. In general alkali chloride salts increase both the main transition temperature (Tm) and the pretransition temperature (Tp) of the DPPC bilayer. The T, increasing effect correlates with the (charge)2/radius-values of the cations. A Li+ >Na+ >K+ >Rb+ >Cs+ order of effectiveness was established. In contrast, up to 3M concentration no specific order of cation effectiveness was noted on the main phase transition temperature. Each of alkali chlorides produced an increase in T, of approximately 1.5[ddot]C at 3M concentration. In contrast with alkali chlorides, alkali nitrates and alkali perchlorates produced no measurable effects on the DPPC phase transition temperature. These results...
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