Resistance of Galactoside-Terminated Alkanethiol Self-Assembled Monolayers to Marine Fouling Organisms
| Autor: | Sheelagh L. Conlan, G.T. Donnelly, James A. Callow, Anthony S. Clare, Bo Liedberg, Maureen E. Callow, Peter Konradsson, Tobias Ekblad, Markus Hederos, Su Wang, Fraddry D’Souza, Qi Zhao, Robert Mutton, Anouk Bruin, Chun-Xia Du, Thomas Ederth, Michala E. Pettitt, Peter R. Willemsen, Xueju J. Su |
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| Rok vydání: | 2011 |
| Předmět: |
Aquatic Organisms
Materials science Biofouling Surface Properties Cobetia marina Nanotechnology Bacterial Adhesion Ulva chemistry.chemical_compound Adsorption Ulva linza Cell Adhesion Animals General Materials Science Sulfhydryl Compounds Marinobacter hydrocarbonoclasticus biology Fouling Thoracica Galactosides Adhesion biology.organism_classification Galactoside Halomonadaceae chemistry Biophysics Protein adsorption |
| Zdroj: | ACS Applied Materials & Interfaces. 3:3890-3901 |
| ISSN: | 1944-8252 1944-8244 |
| DOI: | 10.1021/am200726a |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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