Abstract
Isomeric diacylglycerophosphocholines containing various octadecynoic acids (4-, 6-, 9-, 12-, 14- and 17-octadecynoic acid) were synthesized and purified to homogeneity. Their behaviour in monolayers, when studied by the Langmuir-Blodgett film balance technique, revealed systematic relationships between structure and packing properties. The thermotropic phase behaviour of these novel phospholipids, as measured by differential scanning calorimetry, depended in a systematic fashion on the position of the triple bond: the gel-to-liquid-crystalline phase transition temperature ( T m) passed through a minimum of -3.4°C for a triple bond in position 9.
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