By Rodolfo Paoletti, Dr. David Kritchevsky
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Extra info for Advances in lipid research. / Volume 16
Highly unsaturated phosphatidylcholines gave transition temperatures below 0°C. Natural phosphatidylcholines, which contain a mixture of chain lengths, gave a much broader endotherm at the solid-to-liquid crystal transition than those of a single, discrete chain length. The solid-state properties of both acylglycerols and acylglycerophospholipids in the bulk state are affected by the presence of each other as well as of cholesterol and other lipids. The latter effects are con sidered below under monolayer properties and in a special section reserved for interaction with cholesterol (see Section II,B,3).
However, readily discernible discrepancies are also seen in the proportions of the various species of the diacylglycerophosphorylethanolamines. There are lesser differences in the molecular species of the phosphatidylethanol amines of rat skeletal muscle and red blood cells, which also contain signifi cant amounts of plasmalogenic species (Yeung et al, 1977). In summary, comparison of the composition of molecular species reveals dramatic differences for some glycerophospholipids and marked similarities for others among different tissues within an animal species.
In nature, there is a rough correlation between chain length, unsaturation, and cholesterol content in the membranes of various subcellular fractions. The mitochondrial mem branes contain little cholesterol, and have much more unsaturation in the hydrocarbon chains. In myelin, the cholesterol is present to a much higher degree and the hydrocarbon chains are more saturated. Ladbrooke et al. (1968) have suggested that one of the purposes for cholesterol in cell membranes may be to prevent the lipid chains from crystallizing.
Advances in lipid research. / Volume 16 by Rodolfo Paoletti, Dr. David Kritchevsky