Structural and Mechanical Properties of Thin Films of Bovine Submaxillary Mucin (BSM) vs. Porcine Gastric Mucin (PGM) on a Hydrophobic Surface in Aqueous Solutions

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Structural and Mechanical Properties of Thin Films of Bovine Submaxillary Mucin (BSM) vs. Porcine Gastric Mucin (PGM) on a Hydrophobic Surface in Aqueous Solutions

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Publication Article, peer reviewed scientific
Title Structural and Mechanical Properties of Thin Films of Bovine Submaxillary Mucin (BSM) vs. Porcine Gastric Mucin (PGM) on a Hydrophobic Surface in Aqueous Solutions
Author Madsen, Jan Busk ; Sotres, Javier ; Pakkanen, Kirsi I. ; Efler, Petr ; Svensson, Birte ; Hachem, Maher Abou ; Arnebrant, Thomas ; Lee, Seunghwan
Research Centre Biofilms - Research Center for Biointerfaces
Date 2016
English abstract
The structural and mechanical properties of thin films generated from two types of mucins, namely, bovine submaxillary mucin (BSM) and porcine gastric mucin (PGM) in aqueous environment were investigated with several bulk and surface analytical techniques. Both mucins generated hydrated films on hydrophobic polydimethylsiloxane (PDMS) surfaces from spontaneous adsorption arising from their amphiphilic characteristic. However, BSM formed more elastic films than PGM at neutral pH condition. This structural difference was manifested from the initial film formation processes to the responses to shear stresses applied to the films. Acidification of environmental pH led to strengthening the elastic character of BSM films with increased adsorbed mass, whereas an opposite trend was observed for PGM films. We propose that this contrast originates from that negatively charged motifs are present for both the central and terminal regions of BSM molecule, whereas a similar magnitude of negative charges is localized at the termini of PGM molecule. Given that hydrophobic motifs acting as an anchor are also localized in the terminal region, electrostatic repulsion between anchoring units of PGM molecules on a nonpolar PDMS surface leads to weakening of the mechanical integrity of the films.
DOI https://doi.org/10.1021/acs.langmuir.6b02057 (link to publisher's fulltext.)
Publisher American Chemical Society
Host/Issue Langmuir;38
Volume 32
ISSN 1520-5827
Pages 9687–9696
Language eng (iso)
Subject Sciences
Research Subject Categories::NATURAL SCIENCES
Handle http://hdl.handle.net/2043/21929 Permalink to this page
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