An ESR study of the hydration steps of lecithin multilayers. |
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Authors: | A Sanson M Ptak J L Rigaud C M Gary-BOBO |
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Institution: | Centre de Biophysique Moléculaire, C.N.R.S., 45045 Orleans, Cedex, France;Laboratoire de Physiologie Cellulaire, Collège de France, 11, place Marcelin Bethelot, 75231 Paris Cedex 05, France |
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Abstract: | A spin-labeled stearic acid and other spin-labeled molecules have been used for an ESR study of the hydration process of the egg lecithin lamellar phase for water concentrations, CW greater than 10%. Two hydration steps are found for CW approximately 20% and CW congruent to 30%, in good agreement with results of the literature. To explain discontinuities in the behavior of three spin-labeled molecules at CW congruent to 20%, a conformational change of the phosphatidylcholine polar head and a phase transition in the polar interface are proposed. |
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