³¹P-NMR Studies of the Interactions between
Lecithin and Polar Solvents

Yu. A. Shchipunov, E. V. Shumilina, V. V. Kon’shin, and B. N. Chernyshov

Institute of Chemistry, Far East Division, Russian Academy of Sciences,
pr. Stoletiya Vladivostoka 159, Vladivostok, 690022 Russia

Received January 9, 1996

Abstract—Gel formation in nonaqueous solutions of soybean lecithin induced by polar solvents is studied by
³¹P NMR. The main concepts of our model, according to which phospholipid molecules in polymer-like
micelles are linked via solvent molecules forming linear networks of hydrogen bonds with the phosphate groups
of lecithin, are confirmed. It is shown that gel-forming solvents (water and formamide) and the phosphate group
are H-bonded. The twofold reduction of the chemical shift on transition from formamide to dimethylformamide
is attributed to the decrease in the number of hydrogen bonds due to screening of the amino group by methyl
groups.

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