By Rodolfo Paoletti, Dr. David Kritchevsky
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Extra info for Advances in lipid research. / Volume 16
It was suggested that the interaction of the divalent metal ions with phosphatidylcholine in monolayers is dependent on the packing of the hydrocarbon chains (Shah and Schulman, 1965). Anderson and Pethica (1956) measured the surface potentials of syn thetic dipalmitoylphosphatidylcholine monolayers as a function of the ionic composition of the aqueous subphase. They found that, in dilute solutions of potassium, sodium, and lithium chloride, the surface potential is independent of the concentration and the same for each electrolyte, and concluded that no ion binding to the monolayers occurs.
1973) found the condensation by cholesterol to occur with those molecular species that form expanded films, and most strongly with molecules having a segment of saturated hydrocarbon chain extending nine or more carbons from the carboxyl group. Ghosh and Tinoco (1972) also considered the structural requirements of sterols in this interaction with individual phos phatidylcholine species. Of the sterols tested by Ghosh and Tinoco (1972), all condensed strongly with dipalmitoylphosphatidylcholine at low pres sures, while cholesterol and ß-sitosterol produced the greatest condensation with films prepared from eight other synthetic species.
J. HOLUB AND A. KUKSIS linoleic acid in combination with saturated and monounsaturated acids. The third fraction contained linoleic acid almost exclusively and was pres ent only after feeding safflower oil. It was identified as dilinoleoylphosphatidylcholine. Fraction four was rich in arachidonic acid and saturated acids and accounted for 15-20% of the total chylomicron phosphatidylcholine with both kinds of fat meals. These were largely palmitoyl and stearoyl arachidonates. , 1968; Yurkowski and Walker, 1971) have shown that the phosphatidylcholines normally present in the mucosa are largely the palmitoyl and stearoyl linoleates and arachidonates.
Advances in lipid research. / Volume 16 by Rodolfo Paoletti, Dr. David Kritchevsky