Study of the interaction of water with phospholipid bilayers by FTIR spectroscopy

Authors

  • Valeria Conti Nibali Ruhr Universität
  • Khaoula Khouzami Università degli Studi di Messina
  • Ulderico Wanderlingh Università degli Studi di Messina
  • Caterina Branca Università degli Studi di Messina
  • Giovanna D'Angelo Università degli Studi di Messina

DOI:

https://doi.org/10.1478/AAPP.952A8

Keywords:

Lipid bilayer, solvation water, FTIR, model membranes, phosphatidylcholine (PC), Water distribution

Abstract

The hydration of the dimyristoylphosphatidylcholine multi-bilayers has been studied by means of Fourier transform infrared spectroscopy. The structure of water confined in lipid membrane, under water-rich and water-poor conditions has been investigated by examining the OH stretching band region. We found that the structure of solvation water of lipid bilayer differs from bulk water. In addition, interaction of water molecules with carbonyl group and phosphate group of phosphatidylcholine have been observed through the downshift of the relative vibrational components representing hydrogen bonded groups. We infer  that the disorder of the water network occurs especially in the interfacial region of phospholipids and it increases above the gel to liquid crystalline phase transition, giving rise to an increase of the absorption around 3600 cm-1 which indicates the presence of weakly hydrogen bonded water aggregates.

Author Biography

  • Valeria Conti Nibali, Ruhr Universität
    Lehrstuhl für Physikalische Chemie II

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Published

2017-12-02

Issue

Vol. 95 No. 2 (2017)

Section

Articles

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