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Supported phospholipid monolayers. The molecular structure investigated by vibrational sum frequency spectroscopy
RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, YKI – Ytkemiska institutet.ORCID iD: 0000-0002-8935-8070
2011 (English)In: The Journal of Physical Chemistry C, ISSN 1932-7447, E-ISSN 1932-7455, Vol. 115, no 21, p. 10617-10629Article in journal (Refereed) Published
Abstract [en]

The molecular structure, packing properties, and hydrating water of Langmuir-Blodgett monolayers of the phospholipids 1, 2-distearoyl-sn-glyercophosphatidylcholine (DSPC, 18:0 PC), its deuterated analogue (18:0 PC-d83), and 1, 2-distearoyl-sn-glyerco-phosphatidylserine (DSPC, 18:0 PS) deposited on planar calcium fluoride (CaF2) substrates have been investigated using the surface-specific nonlinear optical technique vibrational sum frequency spectroscopy (VSFS). Compression isotherms were recorded before the deposition of the monolayers at a surface pressure of 35 mN/m, mimicking the conditions of biological cell membranes. The CH and CD stretch regions, the water region, and the lower wavenumber region, containing phosphate, ester, carboxylate, and amine signals, thus partly covering the fingerprint region, were probed to obtain a complete map of the molecules. The data indicate that all deposited monolayers formed a well-ordered and stable film, and probing the water region revealed significant differences in hydration for the different headgroups. In addition, the tilt angle of the aliphatic chains relative to the surface normal was estimated to be approximately 4 degrees to 10 degrees based on orientational analysis using the antisymmetric methyl stretching vibration. Orientational analysis of the ester C=O groups was also performed, and the result was consistent with the estimated tilt angle of the aliphatic chains.

Place, publisher, year, edition, pages
2011. Vol. 115, no 21, p. 10617-10629
Keywords [en]
Supported phospholipid monolayers. The molecular structure investigated by vibrational sum frequency spectroscopy
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Natural Sciences
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URN: urn:nbn:se:ri:diva-27041DOI: 10.1021/jp111587eOAI: oai:DiVA.org:ri-27041DiVA, id: diva2:1054045
Note

A3006

Available from: 2016-12-08 Created: 2016-12-08 Last updated: 2018-08-17Bibliographically approved

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Rutland, Mark W.

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