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• W1991111128 abstract "Although mammalian tissues contain high levels of polyunsaturated fatty acids, our knowledge of the effects of the degree of unsaturation and double-bond location upon bilayer organization is limited. Therefore, a series of mixed-chain unsaturated phosphatidylcholines (PC) comprised of 18:0 at the sn-1 position and various unsaturates at the sn-2 position (18:1n9, 18:2n6, 18:3n6, 18:3n3, 20:2n6, 20:3n6, 20:4n6, 20:5n3, 22:4n6, 22:5n6, or 22:6n3) was studied with differential scanning calorimetry, and their gel to liquid-crystalline phase transitions yielded measurements of Tm, Tonset, delta H, and delta S. Minimal delta H values were obtained for the diene species, 1.7 and 2.9 kcal/mole for 18:2n6 and 20:2n6, respectively. These results are consistent with the dienes having an acyl chain conformation that results in perturbed chain packing. Increasing the degree of unsaturation to three or more double bonds resulted in higher delta H values, 3.7, 4.3, and 4.6 kcal/mole for 18:3n6, 20:3n6, and 20:4n6, respectively, consistent with the occurrence of a gel-state chain conformation(s), which is more tightly packed than the dienes. The 18:0,22:6n3-PC species yielded the highest delta H (6.1 kcal/mole) and delta S(22.7 cal/mol degree) of all the polyunsaturates studied. The distinctive packing properties of phospholipid bilayers containing 22:6n3 may underlie its essential role in the nervous system." @default.
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• W1991111128 date "1994-12-01" @default.
• W1991111128 modified "2023-09-29" @default.
• W1991111128 title "A calorimetric investigation of a series of mixed-chain polyunsaturated phosphatidylcholines: effect of sn-2 chain length and degree of unsaturation" @default.
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• W1991111128 doi "https://doi.org/10.1016/s0006-3495(94)80725-8" @default.
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