Resistance of Galactoside-Terminated Alkanethiol Self-Assembled Monolayers to Marine Fouling Organisms

Thomas Ederth, Tobias Ekblad, Michala E. Pettitt, Sheelagh L. Conlan, Chun-Xia Du, Maureen E. Callow, James A. Callow, Robert Mutton, Anthony S. Clare, Fraddry D'Souza, Glen Donnelly, Anouk Bruin, Peter R. Willemsen, Xueju J. Su, Su Wang, Qi Zhao, Markus Hederos, Peter Konradsson, Bo Liedberg

    Research output: Contribution to journalArticlepeer-review

    41 Citations (Scopus)

    Abstract

    Self-assembled monolayers (SAMs) of galactoside-terminated alkanethiols have protein-resistance properties which can be tuned via the degree of methylation [Langmuir 2005, 21, 2971-2980]. Specifically, a partially methylated compound was more resistant to nonspecific protein adsorption than the hydroxylated or fully methylated counterparts. We investigate whether this also holds true for resistance to the attachment and adhesion of a range of marine species, in order to clarify to what extent resistance to protein adsorption correlates with the more complex adhesion of fouling organisms. The partially methylated galactoside-terminated SAM was further compared to a mixed monolayer of omega-substituted methyl- and hydroxyl-terminated alkanethiols with wetting properties and surface ratio of hydroxyl to methyl groups matching that of the galactoside. The settlement (initial attachment) and adhesion strength of four model marine fouling organisms were investigated, representing both micro- and macrofoulers; two bacteria (Cobetia marina and Marinobacter hydrocarbonoclasticus), barnacle cypris larvae (Balanus amphitrite), and algal zoospores (Ulva linza). The minimum in protein adsorption onto the partially methylated galactoside surface was partly reproduced in the marine fouling assays, providing some support for a relationship between protein resistance and adhesion of marine fouling organisms. The mixed alkanethiol SAM, which was matched in wettability to the partially methylated galactoside SAM, consistently showed higher settlement (initial attachment) of test organisms than the galactoside, implying that both wettability and surface chemistry are insufficient to explain differences in fouling resistance. We suggest that differences in the structure of interfacial water may explain the variation in adhesion to these SAMs.

    Original languageEnglish
    Pages (from-to)3890-3901
    Number of pages12
    JournalACS Applied Materials & Interfaces
    Volume3
    Issue number10
    DOIs
    Publication statusPublished - Oct 2011

    Keywords

    • self-assembled monolayer
    • marine biofouling
    • Cobetia marina
    • Marinobacter hydrocarbonoclasticus
    • Balanus amphitrite
    • Ulva linza
    • BALANUS-AMPHITRITE DARWIN
    • GREEN-ALGA ENTEROMORPHA
    • SURFACE FREE-ENERGY
    • PROTEIN ADSORPTION
    • ADHESION STRENGTH
    • ULVA-LINZA
    • POLY(ETHYLENE GLYCOL)
    • OLIGO(ETHYLENE OXIDE)
    • WETTING PROPERTIES
    • SETTLED SPORES

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