Abstract
Abstract The influence of low molarity (10-50 mM) CaCl2 solutions on the phases and transitions of dipalmitoylphosphatidylcholine was determined using calorimetry and x-ray diffraction. In all cases, a subgel phase was induced before characterization was initiated. The presence of 20-50 mM CaCl2 was shown to have little influence on the pre- and main-phase transitions in DPPC bilayers. However, as the CaCl2 solution concentration is increased, the enthalpy of the subgel to gel bilayer phase transition decreases until no calorimetric endotherm was observed for DPPC in 50 mM CaCl2. An observed broadening of the pre-transition for DPPC in 10 mM CaCl2 can be correlated with a second order phase transition mechanism involving a continuous change in acyl chain packing with no change in mesophase spacing.
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