Bile acid-surfactant interactions at the liquid crystal/aqueous interface

    Authors

    S. H. He; W. L. Liang; K. L. Cheng; J. Y. Fang;S. T. Wu

    Comments

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    Abbreviated Journal Title

    Soft Matter

    Keywords

    SELF-ASSEMBLED MONOLAYERS; CRYSTALS; ADSORPTION; ALIGNMENT; LIPASE; SERIES; Chemistry, Physical; Materials Science, Multidisciplinary; Physics, ; Multidisciplinary; Polymer Science

    Abstract

    The interaction between bile acids and surfactants at interfaces plays an important role in fat digestion. In this paper, we study the competitive adsorption of cholic acid (CA) at the sodium dodecyl sulfate (SDS)laden liquid crystal (LC)/aqueous interface formed with cyanobiphenyl (nCB, n=5-8) and the mixture of 5CB with 4-(4-pentylcyclohexyl) benzonitrile (5PCH). We find that the critical concentration of CA required to displace SDS from the interface linearly decreases from 160 mu M to 16 mM by reducing the alkyl chain length of nCB from n=8 to n=5 and from 16 mu Mto1.5 mu M by increasing the 5PCH concentration from 0 wt% to 19 wt% in the 5PCH-5CB binary mixture. Our results clearly demonstrate that the sensitivity of 5PCH-5CB mixtures for monitoring the interaction between CA and SDS at the LC/aqueous interface can be increased by one order of magnitude, compared to 5CB.

    Journal Title

    Soft Matter

    Volume

    10

    Issue/Number

    26

    Publication Date

    1-1-2014

    Document Type

    Article

    Language

    English

    First Page

    4609

    Last Page

    4614

    WOS Identifier

    WOS:000337136700004

    ISSN

    1744-683X

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