Defining the Catechol–Cation Synergy for Enhanced Wet Adhesion to Mineral Surfaces

Mussel foot proteins (Mfps) exhibit remarkably adaptive adhesion and bridging between polar surfaces in aqueous solution despite the strong hydration barriers at the solid–liquid interface. Recently, catechols and aminestwo functionalities that account for >50 mol % of the amino acid side chains...

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Bibliographic Details
Published in:Journal of the American Chemical Society 2016-07, Vol.138 (29), p.9013-9016
Main Authors: Rapp, Michael V, Maier, Greg P, Dobbs, Howard A, Higdon, Nicholas J, Waite, J. Herbert, Butler, Alison, Israelachvili, Jacob N
Format: Article
Language:English
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Summary:Mussel foot proteins (Mfps) exhibit remarkably adaptive adhesion and bridging between polar surfaces in aqueous solution despite the strong hydration barriers at the solid–liquid interface. Recently, catechols and aminestwo functionalities that account for >50 mol % of the amino acid side chains in surface-priming Mfpswere shown to cooperatively displace the interfacial hydration and mediate robust adhesion between mineral surfaces. Here we demonstrate that (1) synergy between catecholic and guanidinium side chains similarly promotes adhesion, (2) increasing the ratio of cationic amines to catechols in a molecule reduces adhesion, and (3) the catechol–cation synergy is greatest when both functionalities are present within the same molecule.
ISSN:0002-7863
1520-5126
DOI:10.1021/jacs.6b03453