Abstract

Abstract Oriented samples of sphingomyelin (SM), cholesterol (CHOL) and their mixtures in SM : CHOL molar proportions of 4 : 1, 3 : 1, 2 : 1, 1 : 1 and 1 : 2 were studied by x-ray diffraction. These samples were in multilayered form such that a series of discrete series of x-ray reflections were recorded from a well-defined lamellar repeating distance. Samples with SM : CHOL molar ratio of 2 : 1 had a phase different from the SM bilayers alone. Samples with SM : CHOL ratio less than and greater than 2 : 1 appeared to have separate SM and CHOL phases. An x-ray analysis of the diffraction pattern of the 2 : 1 SM : CHOL complex is presented.

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