Hydrogen Bond Networks Near Supported Lipid Bilayers from Vibrational Sum Frequency Generation Experiments and Atomistic Simulations

We report vibrational sum frequency generation spectra from supported lipid bilayers in which the OH and the CH stretching signals are probed at different salt concentrations. Atomistic simulations show a negligible impact of salt on the OH stretching spectra, indicating the observed SFG intensity c...

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Bibliographic Details
Published in:arXiv.org 2018-03
Main Authors: Dogangun, Merve, Ohno, Paul E, Liang, Dongyue, McGeachy, Alicia C, Ariana Gray Be, Dalchand, Naomi, Li, Tianzhe, Cui, Qiang, Geiger, Franz M
Format: Article
Language:English
Subjects:
Hydrogen bonding
Hydrogen bonds
Lipids
Simulation
Stretching
Water chemistry
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Summary:We report vibrational sum frequency generation spectra from supported lipid bilayers in which the OH and the CH stretching signals are probed at different salt concentrations. Atomistic simulations show a negligible impact of salt on the OH stretching spectra, indicating the observed SFG intensity changes are due to chi(3) and potential dependent contributions. These are further analyzed in the contact of exact-zero reference states. Further experiments and simulations identify specific hydrogen bonding interactions between interfacial water molecules at the PC head group of the zwitterionic DMPC lipids at 3200 wavenumbers.
ISSN:2331-8422