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  • P-ISSN 1225-0163
  • E-ISSN 2288-8985

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    A solid-state NMR study on the hydration effect on the lipid phase change in the presence of an antimicrobial peptide

    Analytical Science and Technology / Analytical Science and Technology, (P)1225-0163; (E)2288-8985
    2013, v.26 no.6, pp.395-400
    https://doi.org/10.5806/AST.2013.26.6.395

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    Abstract

    The hydration and antimicrobial peptide effects on the lipid alignment on the surface of a thin glass plate were investigated by using the solid-state nuclear magnetic resonance spectroscopy. Pure 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphotidylcholine (POPC) lipid molecules were well aligned on the surface of a thin glass plate without direct hydration by placing the sample for a few days in the desiccator containing a saturated sodium phosphate dibasic solution, which provided 95% relative humidity. But there was a big difference between two lipid phases, the one of which was hydrated by placing the sample for a few days in the desiccator with 95% relative humidity without direct hydration and the other was directly hydrated by dropping water and then placed for a few days in the same desiccator. The surface mobility of POPC molecules in a lipid bilayer phase was much activated by water. While the time for the POPC to align on the glass plate surface was short, the time for the PG-1/POPC mixture to reach the its equilibrium state was long.

    keywords
    antimicrobial peptide, protegrin-1, lipid bilayer, hydration effect, solid-state NMR


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