✦ LIBER ✦

Interaction of water with egg lecithin in benzene solution

✍ Scribed by J.B. Davenport; L.R. Fisher

Publisher: Elsevier Science
Year: 1975
Tongue: English
Weight: 732 KB
Volume: 14
Category: Article
ISSN: 0009-3084
DOI: 10.1016/0009-3084(75)90062-6

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✦ Synopsis

Benzene solutions of purified egg leothln, with small amounts of water added, have been examined by 60 MHz and 100 MHz NMR spectroscopy, infrared spectrophotometry and phase contrast microscopy The transverse relaxation times of the water, N-methyl and O-H protons are dependent on water concentration This dependence changes sharply tot the water proton at a level of one water molecule per lecithin monohydrate molecule These results do not fully agree with those reported by other workers Four mathematical models are examined which could account for the behavlour of the water protons Models which assume a constant transverse relaxation time for water protons above a level of one water molecule per lecithin molecule cannot predict the behavlour observed It is sufficient to assume that water protons above th~s concentration have a smgle relaxation time whtch is a hnear function of water concentration The added water assocmtes pnmartly with the phosphate in the leothm head group. Above nine water molecules per leothm monohydrate molecule free water is present m the system

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