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On the stability of the ripple phase in the DPPC/PLPC/water ternary system |
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| Authors: | A Checchetti G Chidichimo A Golemme D Grasso D Imbardelli C La Rosa F P Nicoletta P W Westerman |
| Institution: | a Dipartimento di Chimica, Università della Calabria, 87036 Rende (CS), Italy b Dipartimento di Chimica, Università di Catania, via A. Doria 8, 95125 Catania, Italy c Department of Biochemistry and Molecular Pathology, Northeastern Ohio Universities' College of Medicine, P.O. Box 95, Rootstown, Ohio 44272, U.S.A |
| Abstract: | The effect of incorporation of 1-palmitoyl-sn-glycero-3-phosphocholine (PLPC) on the structure of the Pβ′ ripple mesophase in aqueous dispersions of 1,2-dipalmitoyl-sn-glycero-3-phosphocholine (DPPC) has been studied by differential scanning calorimetry (DSC) and scanning dilatometry (SD). For samples containing 34 wt. % 2H2O and 0–15 wt. % PLPC, a pretransition was observed by DSC. The pretransition disappears at 15 wt. % PLPC. The behavior of thermodynamic functions at the pretransition and main transition gives new insights on the structural changes produced by PLPC on bilayers of DPPC. |
| Keywords: | Pretransition Lipid bilayers Lysolecithin Phosphatidylcholine Differential scanning calorimetry (DSC) Scanning dilatometry (SD) |
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