Hydration of phospholipid bilayers in the presence and absence of cholesterol

The number of water molecules bound (unfreezable) by a molecule of dipalmitoyl phosphatidylserine (DPPS) or by a molecule of dipalmitoyl phosphatidylcholine (DPPC) alone or in mixtures with cholesterol was determined by differential scanning calorimetry (DSC). When the phospholipids are in the gel s...

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Bibliographic Details
Published in:Chemistry and physics of lipids 2005-07, Vol.136 (1), p.67-72
Main Authors: Bach, D., Miller, I.R.
Format: Article
Language:English
Subjects:
1,2-Dipalmitoylphosphatidylcholine - chemistry
Calorimetry
Cholesterol
Cholesterol - chemistry
Differential scanning calorimetry (DSC)
Dimyristoyl phosphatidylcholine (DMPC)
Dimyristoyl phosphatidylserine (DMPS)
Dipalmitoyl phosphatidylcholine (DPPC)
Dipalmitoyl phosphatidylserine (DPPS)
Hydration
Lipid Bilayers - chemistry
Phosphatidyl serine natural (PS)
Phosphatidylserines - chemistry
Phospholipid bilayers
Polarized attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR)
Thermodynamics
Water - chemistry
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Summary:The number of water molecules bound (unfreezable) by a molecule of dipalmitoyl phosphatidylserine (DPPS) or by a molecule of dipalmitoyl phosphatidylcholine (DPPC) alone or in mixtures with cholesterol was determined by differential scanning calorimetry (DSC). When the phospholipids are in the gel state and in the absence of cholesterol, molecule of DPPS binds about 3.5 molecules of water and molecule of DPPC binds about 6 molecules of water. Number of water molecules bound increases when cholesterol crystallites are formed in the bilayer. For DPPS–cholesterol mixture at X(chol) −0.5, as well as for DPPC–cholesterol mixture at X(chol) –0.5 about 7 water molecules are bound.
ISSN:0009-3084
1873-2941
DOI:10.1016/j.chemphyslip.2005.04.001