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Propofol adsorption at the air/water interface: a combined vibrational sum frequency spectroscopy, nuclear magnetic resonance and neutron reflectometry study.

Abstract

Propofol is an amphiphilic non-surfactant that strongly influences the function of cell membranes, yet data regarding interfacial properties of propofol remains scarce. Here we consider propofol adsorption at the air/water interface as elucidated by means of vibrational sum frequency spectroscopy (VSFS), neutron reflectometry (NR), and surface tensiometry. Vibrational sum frequency spectroscopy data show that propofol adsorbed at the air/water interface interacts with water with both strong hydrogen bonding interactions and with weak interactions in the proximity of the hydrocarbon parts of the molecule. In the concentration range studied there is almost no change in the orientation adopted at the interface. Neutron reflectometry shows that propofol forms a dense monolayer with a thickness of 8.6 Å and a limiting area per molecule of 40 Å2, close to the value extracted from surface tensiometry. The possibility that islands or multilayers of propofol form at the air/water interface is therefore excluded as long as the solubility limit is not exceeded. Additionally, nuclear magnetic resonance (NMR) measurements of the 1H nuclear magnetic resonance chemical shifts demonstrate that propofol does not form dimers or multimers in bulk water up to the solubility limit.

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Publication details

The article was received on 15 Aug 2018, accepted on 07 Nov 2018 and first published on 08 Nov 2018


Article type: Paper
DOI: 10.1039/C8SM01677A
Citation: Soft Matter, 2018, Accepted Manuscript
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    Propofol adsorption at the air/water interface: a combined vibrational sum frequency spectroscopy, nuclear magnetic resonance and neutron reflectometry study.

    P. Niga, P. Hansson-Mille, A. Swerin, P. M. Claesson, J. Schoelkopf, P. A. C. Gane, J. Dai, I. Furó, R. A. Campbell and C. M. Johnson, Soft Matter, 2018, Accepted Manuscript , DOI: 10.1039/C8SM01677A

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