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The Effect of Enzymolysis on Performance of Soy Protein-Based Adhesive

In this study, bromelain was used to break soy protein molecules into polypeptide chains, and triglycidylamine (TGA) was added to develop a bio-adhesive. The viscosity, residual rate, functional groups, thermal behavior, and fracture surface of different adhesives were measured. A three-ply plywood...

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Autores principales: Xu, Yantao, Xu, Yecheng, Han, Yufei, Chen, Mingsong, Zhang, Wei, Gao, Qiang, Li, Jianzhang
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6278455/
https://www.ncbi.nlm.nih.gov/pubmed/30356000
http://dx.doi.org/10.3390/molecules23112752
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author Xu, Yantao
Xu, Yecheng
Han, Yufei
Chen, Mingsong
Zhang, Wei
Gao, Qiang
Li, Jianzhang
author_facet Xu, Yantao
Xu, Yecheng
Han, Yufei
Chen, Mingsong
Zhang, Wei
Gao, Qiang
Li, Jianzhang
author_sort Xu, Yantao
collection PubMed
description In this study, bromelain was used to break soy protein molecules into polypeptide chains, and triglycidylamine (TGA) was added to develop a bio-adhesive. The viscosity, residual rate, functional groups, thermal behavior, and fracture surface of different adhesives were measured. A three-ply plywood was fabricated and evaluated. The results showed that using 0.1 wt% bromelain improved the soy protein isolate (SPI) content of the adhesive from 12 wt% to 18 wt%, with viscosity remaining constant, but reduced the residual rate by 9.6% and the wet shear strength of the resultant plywood by 69.8%. After the addition of 9 wt% TGA, the residual rate of the SPI/bromelain/TGA adhesive improved by 13.7%, and the wet shear strength of the resultant plywood increased by 681.3% relative to that of the SPI/bromelain adhesive. The wet shear strength was 30.2% higher than that of the SPI/TGA adhesive, which was attributed to the breakage of protein molecules into polypeptide chains. This occurrence led to (1) the formation of more interlocks with the wood surface during the curing process of the adhesive and (2) the exposure and reaction of more hydrophilic groups with TGA to produce a denser cross-linked network in the adhesive. This denser network exhibited enhanced thermal stability and created a ductile fracture surface after the enzymatic hydrolysis process.
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spelling pubmed-62784552018-12-13 The Effect of Enzymolysis on Performance of Soy Protein-Based Adhesive Xu, Yantao Xu, Yecheng Han, Yufei Chen, Mingsong Zhang, Wei Gao, Qiang Li, Jianzhang Molecules Article In this study, bromelain was used to break soy protein molecules into polypeptide chains, and triglycidylamine (TGA) was added to develop a bio-adhesive. The viscosity, residual rate, functional groups, thermal behavior, and fracture surface of different adhesives were measured. A three-ply plywood was fabricated and evaluated. The results showed that using 0.1 wt% bromelain improved the soy protein isolate (SPI) content of the adhesive from 12 wt% to 18 wt%, with viscosity remaining constant, but reduced the residual rate by 9.6% and the wet shear strength of the resultant plywood by 69.8%. After the addition of 9 wt% TGA, the residual rate of the SPI/bromelain/TGA adhesive improved by 13.7%, and the wet shear strength of the resultant plywood increased by 681.3% relative to that of the SPI/bromelain adhesive. The wet shear strength was 30.2% higher than that of the SPI/TGA adhesive, which was attributed to the breakage of protein molecules into polypeptide chains. This occurrence led to (1) the formation of more interlocks with the wood surface during the curing process of the adhesive and (2) the exposure and reaction of more hydrophilic groups with TGA to produce a denser cross-linked network in the adhesive. This denser network exhibited enhanced thermal stability and created a ductile fracture surface after the enzymatic hydrolysis process. MDPI 2018-10-24 /pmc/articles/PMC6278455/ /pubmed/30356000 http://dx.doi.org/10.3390/molecules23112752 Text en © 2018 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Xu, Yantao
Xu, Yecheng
Han, Yufei
Chen, Mingsong
Zhang, Wei
Gao, Qiang
Li, Jianzhang
The Effect of Enzymolysis on Performance of Soy Protein-Based Adhesive
title The Effect of Enzymolysis on Performance of Soy Protein-Based Adhesive
title_full The Effect of Enzymolysis on Performance of Soy Protein-Based Adhesive
title_fullStr The Effect of Enzymolysis on Performance of Soy Protein-Based Adhesive
title_full_unstemmed The Effect of Enzymolysis on Performance of Soy Protein-Based Adhesive
title_short The Effect of Enzymolysis on Performance of Soy Protein-Based Adhesive
title_sort effect of enzymolysis on performance of soy protein-based adhesive
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6278455/
https://www.ncbi.nlm.nih.gov/pubmed/30356000
http://dx.doi.org/10.3390/molecules23112752
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