1. Differential Scanning Calorimetry
DPPC
00C for 3 days
Trapped kinetic states

2. Polymorphic Structure Depends:
Structure of lipid –head group and acyl chains
Degree of hydration
T, P, pH, ionic strength
Polymorphic Structure Depends:

3. DSC for DPPH as a function of water hydration
CHAIN LENGTH

4. DxPC
DxPC
Ripple to liquid = solid
Gel to ripple = open
X=2 gives straightest line. Concept : Carbonyl and terminal methyl do not stabilize transition and that the gel liquid is dominated by chain melting
Extrapolates to 151oC polymethylene (138oC mp)
Extrapolates to n = 4.8 at 0K, implies you need at least 5 carbon atoms in chain for an organized assembled structure

5. DxPC
Need at least 8C to have lamellar structures, smaller acyl chains form micelles

9. POPC vs OPPC