By Rodolfo Paoletti, Dr. David Kritchevsky
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Extra info for Advances in lipid research. / Volume 16
1973). As expected, egg phosphatidylcholine gives a much lower viscosity than dipalmitoylphosphatidylcholine and both have greatly increased vis cosity when cholesterol is added. 4. , 1976). The occurrence of characteristic molecular species of acylglycerols and diacylglycerophospholipids in natural lipoproteins and membrane complexes agrees best with models of the type put forward by Benson (1966), Wallach et al. (1975), and Singer and Nicolson (1972), in which a membrane peptide is envisaged to be located on both of the membrane surfaces and also within the apolar core of the membrane.
The behavior of the mixed cholesterolphosphatidylcholine films was attributed in part to van der Waals inter actions which varies with different molecular species. Ghosh et al. (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.
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.