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Issue 13, 2012
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Embedded proteins and sacrificial bonds provide the strong adhesive properties of gastroliths

Esben Thormann,a  Hiroyasu Mizuno,a  Kjell Jansson,b  Niklas Hedin,b  M. Soledad Fernández,c  José Luis Arias,c  Mark W. Rutland,ad  Ranjith Krishna Pai*b  and  Lennart Bergström*b 
Author affiliations

* Corresponding authors

a KTH Royal Institute of Technology, Department of Chemistry, Surface and Corrosion Science, SE-100 44 Stockholm, Sweden

b Department of Materials and Environmental Chemistry, Arrhenius Laboratory, Stockholm University, SE-106 91 Stockholm, Sweden
E-mail: lennart.bergstrom@mmk.su.se, rkpai@bnl.gov

c Faculty of Veterinary Sciences and CIMAT, University of Chile, Santiago, Chile

d YKI, Institute for Surface Chemistry, Drottning, Kristinas vag 45, 114 86 Stockholm, Sweden

Abstract

The adhesive properties of gastroliths from a freshwater crayfish (Cherax quadricarinatus) were quantified by colloidal probe atomic force microscopy (AFM) between heavily demineralized gastrolith microparticles and gastrolith substrates of different composition. Combined AFM and transmission electron microscopy studies demonstrated that the sequential detachment and large adhesion energies that characterise the adhesive behaviour of a native gastrolith substrate are dominated by sacrificial bonds between chitin fibres and between chitin fibres and CaCO3. The sacrificial bonds were shown to be strongly related to the gastrolith proteins and when the majority of these proteins were removed by ethylenediaminetetraacetic acid (EDTA), the sequential detachment disappeared and the adhesive energy was reduced by more than two orders of magnitude.

Graphical abstract: Embedded proteins and sacrificial bonds provide the strong adhesive properties of gastroliths

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Publication details

The article was received on 05 Mar 2012, accepted on 24 Apr 2012 and first published on 26 Apr 2012


Article type: Paper
DOI: 10.1039/C2NR30536D
Citation: Nanoscale, 2012,4, 3910-3916
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    Embedded proteins and sacrificial bonds provide the strong adhesive properties of gastroliths

    E. Thormann, H. Mizuno, K. Jansson, N. Hedin, M. S. Fernández, J. L. Arias, M. W. Rutland, R. K. Pai and L. Bergström, Nanoscale, 2012, 4, 3910
    DOI: 10.1039/C2NR30536D

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