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The Interdigitated Gel Phase in Mixtures of Cationic and Zwitterionic Phospholipids

The Interdigitated Gel Phase in Mixtures of Cationic and Zwitterionic Phospholipids

Eric A Smith, Phoebe K Dea

Biophys Chem. 2015 Jan;196:86-91.

PMID: 25451682

Abstract:

To examine the phase behavior of mixtures of zwitterionic and cationic lipids we used three derivatives of 1,2-dipalmitoyl-sn-glycero-3-phosphocholine (DPPC). All three lipids are uniquely capable of spontaneously forming the interdigitated gel phase (LβI) under typical hydration conditions. The P-O-ethyl derivative, 1,2-dipalmitoyl-sn-glycero-3-ethylphosphocholine (EDPPC), was chosen as the cationic lipid. For the zwitterionic lipids, we use the ether-linked 1,2-di-O-hexadecyl-sn-glycero-3-phosphocholine, (DHPC) and the fluorine substituted 1-palmitoyl-2-(16-fluoropalmitoyl)-sn-glycero-3-phosphocholine (F-DPPC). Differential scanning calorimetry (DSC) and fluorescence spectroscopy were used to analyze the lipid mixtures. The F-DPPC/EDPPC mixtures are interdigitated at all lipid ratios below the main transition temperature (Tm). In addition, EDPPC stabilizes the interdigitated gel phase of DHPC until the ripple gel phase (Pβ') is eliminated and only the LβI to liquid crystalline phase (Lα) main transition remains. These results demonstrate that mixtures of cationic and zwitterionic lipids can be compatible with the interdigitated phase.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP36314473	1,2-Di-O-hexadecyl-sn-glycero-3-phosphocholine		36314-47-3	Price

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