Recombinant Spider Silk Protein and Delignified Wood Form a Strong Adhesive System

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University , A , Tersteegen , J , Sammaljarvi , J , Aranko , A S & Linder , M B 2021 , ' Recombinant Spider Silk Protein and Delignified Wood Form a Strong Adhesive System ' , ACS Sustainable Chemistry & Engineering , vol. 10 , no. 1 , pp. 552–561 .

Title: Recombinant Spider Silk Protein and Delignified Wood Form a Strong Adhesive System
Author: University, Aalto; Tersteegen, Jennifer; Sammaljarvi, Juuso; Aranko, A. Sesilja; Linder, Markus B.
Contributor organization: Department of Chemistry
Date: 2021-12-22
Language: eng
Number of pages: 10
Belongs to series: ACS Sustainable Chemistry & Engineering
ISSN: 2168-0485
Abstract: For developing novel fully biological materials, a central question is how we can utilize natural components in combination with biomimetic strategies in ways that both allow feasible processing and high performance. Within this development, adhesives play a central role. Here, we have combined two of nature's excellent materials, silk and cellulose, to function as an adhesive system. As an initial step in processing, wood was delignified. Without lignin, the essential microstructure and alignment of the wood remain, giving a strong scaffold that is versatile to process further. A recombinant spider silk protein was used as a fully biological and water-based adhesive. The adhesive strength was excellent with an average value of 6.7 MPa, with a maximum value of up to 10 MPa. Samples of different strengths showed characteristic features, with high tear-outs for weaker samples and only little tear-out for strong samples. As references, bovine serum albumin and starch were used. Based on the combined data, we propose an overall model for the system and highlight how multiple variables affect performance. Adhesives, in particular, biobased ones, must be developed to be compatible with the overall adherend system for suitable infiltration and so that their mechanical properties match the adherend. The engineering of proteins gives an unmatched potential for designing adhesive systems that additionally have desired properties such as being fully water-based, biologically produced, and renewable.
Subject: cellulose
protein engineering
cellulose-binding domain
lap shear strength
bovine serum albumin
Araneus diadematus
amino acid analysis
116 Chemical sciences
Peer reviewed: Yes
Rights: cc_by
Usage restriction: openAccess
Self-archived version: publishedVersion

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