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    Structural conformation of lipids at the oil–water interface 
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    Structural conformation of lipids at the oil–water interface

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    Accepted version (1.129Mb)
    Volume
    8
    Pagination
    8904 - 8910
    Publisher
    RSC Publishing Logo
    Publisher URL
    http://pubs.rsc.org/
    DOI
    10.1039/C2SM26028J
    Journal
    SoftMatter
    Issue
    34
    Metadata
    Show full item record
    Abstract
    A neutron reflectivity study of the phospholipid 1,2-distearoyl-sn-glycero-3-phosphocholine at the hexadecane–water interface is reported as a function of spread amount. Two isotopic contrasts have been used to determine the structure of the phospholipid molecule in the buried interfacial region. The results indicate a roughened or diffuse monolayer at low spread amounts of phospholipid at the oil–water interface. An increase in the spread amount of phospholipid results in combination of a monolayer plus micelle-like aggregates formation at the interface. There is a transition from a monolayer to a more complex monolayer and micelle-like aggregates conformation as the amount of spread phospholipid increases. The total layer thickness for these fits is about 70 Å, which is much larger than a fully extended DSPC molecule ([similar]30 Å). This is indicative of rough molecular packing at the oil–water interface. This roughened or diffuse interface is suggested to be because of the solvation effect of the hydrocarbon tails and the resultant hydrophobic interactions. In addition, a minor contribution may originate from the accommodation of the charges in the head groups.
    Authors
    Zarbakhsh, A; Lawrence,, MJ; Webster, JRP; Campana, M
    URI
    http://qmro.qmul.ac.uk/xmlui/handle/123456789/5374
    Collections
    • School of Biological and Chemical Sciences [1924]
    Language
    English
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