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816 Biochemistry 1986, 25, 8 16-822 Polymorphic Phase Behavior of Unsaturated lysophosphatidylethanolamines : A 31P NMR and X-ray Diffraction Study? C. P. S. Tilcock,* P. R. Cullis, and M. J. Hope Department of Biochemistry, The University of British Columbia, Vancouver, British Columbia, Canada V6T 1 W5 S. M. Gruner Department of Physics, Princeton University, Princeton, New Jersey 08544 Received August 5, 1985 ABSTRACT: The Polymorphic Phase Behavior of aqueous dispersions of 1-oleoyl-, 1-linoleoyl-, and 1 - linolenoyl-sn-3-glycerophosphoethanolami ne ( 1 -C 18: l,-PE, 1 -C 18:2,-PE, and 1 -C 18:3,-PE, respectively) has been investigated by 31P NMR, small-angle and wide-angle X-ray diffraction, and freeze-fracture techniques in response to changes in temperature and pH. Between -20 and 0 "C at pH 7, NMR and X-ray data indicate that 1-C18:lC-PE adopts a lamellar Phase . Above 20 OC, the X-ray diffraction from 1-C18:lC-PE reveals no long-range lattice order, whereas the NMR data indicate lamellar structure to 90 OC.
816 Biochemistry 1986, 25, 8 16-822 Polymorphic Phase Behavior of Unsaturated Lysophosphatidylethanolamines: A 31P NMR and X-ray Diffraction Study? C. P. S. Tilcock,* P. R. Cullis, and M. J. Hope
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