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Observation of buried water molecules in phospholipid membranes by surface sum-frequency generation spectroscopy

J. Chem. Phys. 131, 161107 (2009); doi:10.1063/1.3257600

Published 29 October 2009

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Maria Sovago,1 Erik Vartiainen,2 and Mischa Bonn1
1FOM Institute for Atomic and Molecular Physics, Sciencepark 104, 1098XG Amsterdam, The Netherlands
2Lappeenranta University of Technology (LUT), P.O. Box 20, Fin-53851 Lappeenranta, Finland
We investigate the structure and orientation of water molecules at the water-lipid interface, using vibrational sum-frequency generation in conjunction with a maximum entropy phase retrieval method. We find that interfacial water molecules have an orientation opposite to that predicted by electrostatics and thus are likely localized between the lipid headgroup and its apolar alkyl chain. This type of water molecule is observed for phospholipids but not for structurally simpler surfactants. ©2009 American Institute of Physics
History: Received 5 August 2009; accepted 10 October 2009; published 29 October 2009
Permalink: http://link.aip.org/link/?JCPSA6/131/161107/1
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KEYWORDS and PACS

Keywords
PACS
  • 87.64.K-
    Spectroscopy in biophysics and medical physics
  • 87.16.D-
    Biomembranes, bilayers, and vesicles
  • 42.65.Ky
    Optical frequency conversion; harmonic generation
  • 87.15.B-
    Structure of biomolecules
  • 87.15.M-
    Spectra of biomolecules
  • YEAR: 2009

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PUBLICATION DATA

ISSN:
0021-9606 (print)   1089-7690 (online)
Publisher:
AIP is a member of CrossRef AIP

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