Phase equilibria of model milk membrane lipid systems |
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Authors: | Waninge Rianne Nylander Tommy Paulsson Marie Bergenståhl Björn |
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Affiliation: | Division of Food Technology, Lund University, P.O. Box 124, S-22100, Lund, Sweden. Rianne.Waninge@livsteki.lth.se |
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Abstract: | The phase behaviour of mixtures of recombined milk membrane lipids dioleoylphosphatidylcholine (DOPC), sphingomyelin (SM), dioleoylphosphatidylethanolamine (DOPE), phosphatidylinositol (PI) and dioleoylphosphatidylserine (DOPS) in 60% water was examined as a function of temperature between 5 and 90 degrees C. The aim was to examine under which lipid composition the average properties turn from balanced over to hydrophobic. The phase boundaries were determined by small angle X-ray diffraction (SAXD) and differential scanning calorimetry (DSC). The lamellar phase was dominating in the DOPC/SM/DOPE system. The phase boundary for the reversed hexagonal phase was only observed at high DOPE content within the examined temperature interval. The anionic phospholipids PI and DOPS induced a swollen lamellar phase, but no significant change of the transition between the lamellar phase and the reversed hexagonal phase was observed. |
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Keywords: | Phospholipid bilayer Milk fat globule membrane (MFGM) Phase behaviour Differential scanning calorimetry (DSC) Small angle X-ray diffraction (SAXD) |
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