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, C W > 10%. Two hydration steps are found for C W ≅ 20% and C w ≅ 30%, in good agreement with results of the literature. To explain discontinuities in the behavior of three spin-labeled molecules at C W ≅ 20%, a conformational change of the phosphatidylcholine polar head and a phase transition in the polar interface are proposed.
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