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Fourier transform infrared spectroscopy (FT-IR) and X-ray diffraction-tools for probing lipopolysaccharide and lipid a membranes from gram-negative bacteria

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Abstract

FT-IR and X-ray techniques were used to get an insight into the structure of synthetic Salmonella lipid A membranes. While FT-IR was sensitively providing structure information at the molecular level from different parts of the molecule, X-ray scattering gave data on long-range order phenomena and on fatty acid chain packing pattern. The lipid A membranes exhibited lamellar structures throughout the temperature range of 4°C to 60°C and showed up to three temperature induced “transitions”. The main transitionT 3 at 47°C was assigned to anL βL α transition. The weak features atT 1 andT 2 localized between 15 and 40°C seemed to be connected to packing phenomena of lipid A aggregates within the distorted lattice.

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Naumann, D., Schultz, C., Born, J. et al. Fourier transform infrared spectroscopy (FT-IR) and X-ray diffraction-tools for probing lipopolysaccharide and lipid a membranes from gram-negative bacteria. Mikrochim Acta 94, 379–383 (1988). https://doi.org/10.1007/BF01205911

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  • DOI: https://doi.org/10.1007/BF01205911

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