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- W67825044 abstract "High-sensitivity differential scanning calorimetric, vibrational Raman, and /sup 31/P NMR spectroscopic experiments have been performed as a function of temperature on aqueous dispersions of 1-0-octadeyl-2-acetoyl-sn-glycero-3-phosphocholine, a chemically synthesized platelet-activating factor. In the temperature range of -7 to 30/sup 0/C, the C(18):PAF-H/sub 2/O system is shown by Raman spectroscopy in the C-H stretching mode region to undergo two thermal phase transitions centered at 9.2 and 18.4/sup 0/C. However, an additional transition at 17.6/sup 0/C is observed by DSC, which can be assigned as the pretransition, or gel (I) ..-->.. gel (I') transition. The low temperature transition, attributed to the interdigitated lamellar gel (II) ..-->.. gel (I) phase transition is characterized by the breakdown of large interdigitated lamellar organizations into small, but aggregated, bilayer vesicles. The high-temperature transition corresponds to the interdigitated lamellar gel (I') ..-->.. micellar transition. The molecular ordering and packing structure of C(18):PAF in the various lamellar phases and phase transition regions will be discussed. It appears that the interdigitated lamellar gel (I) phase is unique for C(18):PAF dispersions when compared to the behavior of other chemically closely related phospholipids in excess water." @default.
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- W67825044 date "1986-05-01" @default.
- W67825044 modified "2023-09-26" @default.
- W67825044 title "Platelet-activating factor assemblies in excess water" @default.
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