Microphase Behavior and Enhanced Wet-Cohesion of Synthetic Copolyampholytes Inspired by a Mussel Foot Protein
| Autor: | Claus D. Eisenbach, Piotr J. Zalicki, Jacob N. Israelachvili, Saurabh Das, Razieh Mirshafian, J. Herbert Waite, Sungbaek Seo, B. Kollbe Ahn |
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| Rok vydání: | 2015 |
| Předmět: |
Surface Properties
Molecular Sequence Data Biochemistry Catalysis chemistry.chemical_compound Colloid and Surface Chemistry Biomimetic Materials Amphiphile Electrochemistry Animals Polymethyl Methacrylate Organic chemistry Amino Acid Sequence Peptide sequence Catechol Coacervate Aqueous solution Chemistry Cationic polymerization Proteins Adhesiveness General Chemistry Mussel Bivalvia Chemical engineering Chemical Sciences Adhesive Biotechnology |
| Zdroj: | Journal of the American Chemical Society, vol 137, iss 29 Seo, S; Das, S; Zalicki, PJ; Mirshafian, R; Eisenbach, CD; Israelachvili, JN; et al.(2015). Microphase Behavior and Enhanced Wet-Cohesion of Synthetic Copolyampholytes Inspired by a Mussel Foot Protein. Journal of the American Chemical Society, 137(29), 9214-9217. doi: 10.1021/jacs.5b03827. UC Santa Barbara: Retrieved from: http://www.escholarship.org/uc/item/9qd4s083 |
| ISSN: | 1520-5126 0002-7863 |
| DOI: | 10.1021/jacs.5b03827 |
| Popis: | © 2015 American Chemical Society. Numerous attempts have been made to translate mussel adhesion to diverse synthetic platforms. However, the translation remains largely limited to the Dopa (3,4-dihydroxyphenylalanine) or catechol functionality, which continues to raise concerns about Dopa's inherent susceptibility to oxidation. Mussels have evolved adaptations to stabilize Dopa against oxidation. For example, in mussel foot protein 3 slow (mfp-3s, one of two electrophoretically distinct interfacial adhesive proteins in mussel plaques), the high proportion of hydrophobic amino acid residues in the flanking sequence around Dopa increases Dopa's oxidation potential. In this study, copolyampholytes, which combine the catechol functionality with amphiphilic and ionic features of mfp-3s, were synthesized and formulated as coacervates for adhesive deposition on surfaces. The ratio of hydrophilic/hydrophobic as well as cationic/anionic units was varied in order to enhance coacervate formation and wet adhesion properties. Aqueous solutions of two of the four mfp-3s-inspired copolymers showed coacervate-like spherical microdroplets ( ≈ 1-5 μm at pH ∼4 (salt concentration ∼15 mM). The mfp-3s-mimetic copolymer was stable to oxidation, formed coacervates that spread evenly over mica, and strongly bonded to mica surfaces (pull-off strength: ∼17.0 mJ/m2). Increasing pH to 7 after coacervate deposition at pH 4 doubled the bonding strength to ∼32.9 mJ/m2without oxidative cross-linking and is about 9 times higher than native mfp-3s cohesion. This study expands the scope of translating mussel adhesion from simple Dopa-functionalization to mimicking the context of the local environment around Dopa. (Figure Presented). |
| Databáze: | OpenAIRE |
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