Biophysical Journal 67: 1882-1887 (1994)
© 1994 the Biophysical Society

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Hydration force parameters of phosphatidylcholine lipid bilayers as determined from 2H-NMR studies of deuterated water.

Faculty of Physics and Geophysics, University of Leipzig, Germany.

ABSTRACT

The continuous decrease of the quadrupolar splitting of deuterated water interacting with phosphocholine lipid bilayers with growing water concentration is analyzed as a function of the water activity. From the apparent linear dependence on water activity a measure for hydration forces is obtained. The forces calculated are in the range of published data using sorption isotherms and osmotic stress technique in combination with SAXS. A simple interaction potential which includes orientational order of water adsorbed on surfaces gives a physical base for these findings. Therefore, deuterium NMR may become a powerful tool for hydration force analysis complementing well-known methods.

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