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. 1977 Dec 27;16(26):5742-5.
doi: 10.1021/bi00645a014.

Deuteron nuclear magnetic resonance studies of phase equilibria in a lecithin-water system

J Ulmius, H Wennerström, G Lindblom, G Arvidson

Deuteron nuclear magnetic resonance studies of phase equilibria in a lecithin-water system

J Ulmius et al. Biochemistry. .

Abstract

Water deuteron NMR spectra have been studied for the system dipalmitoyllecithin (DPL)-heavy water (D2O) at different compositions and temperatures. From an analysis of the spectra in terms of quadrupole splittings, a phase diagram has been constructed for the temperature range 25-60 degrees C and the composition range 4-15 mol of D2O/mol of DPL. Evidence is given that the "pretransition" observed by differential scanning calorimetry is caused by a crossing of a three-phase line. Strong support for a specific hydration of about 11 water molecules per lecithin molecule in the phase between the pretransition and main transition is also found.

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