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Biophysical Journal 20: 169-179 (1977)
© 1977 the Biophysical Society

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Hydration of phosphatidylocholine. Adsorption isotherm and proton nuclear magnetic resonance studies.

D A Wilkinson, H J Morowitz and J H Prestegard

ABSTRACT

Adsorption-desorption isotherms were obtained for water binding by 1,2-dimyristoylphosphatidylcholine in the temperature range 15 degrees-35 degrees C. The isotherms were analyzed by Brunauer et al.'s (BET) theory and also a polarization theory, the latter being more successful in fitting the data. There was some evidence for a change in the surface field of the lipid bilayer around 25 degrees C. Proton T1 and T2 measurements were used to obtain a log-normal molecular correlation time distribution for water protons in these systems. This distribution was compared with the isotherm data to effect a description of several classes of water molecules.






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Copyright © 1977 by the Biophysical Society.