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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| Format: | Article |
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MDPI AG
2018-10-01
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| Series: | Molecules |
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| Online Access: | https://www.mdpi.com/1420-3049/23/11/2752 |
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| author | Yantao Xu Yecheng Xu Yufei Han Mingsong Chen Wei Zhang Qiang Gao Jianzhang Li |
| author_facet | Yantao Xu Yecheng Xu Yufei Han Mingsong Chen Wei Zhang Qiang Gao Jianzhang Li |
| author_sort | Yantao Xu |
| collection | DOAJ |
| 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. |
| first_indexed | 2024-12-17T10:33:00Z |
| format | Article |
| id | doaj.art-f6438415b7ee4ede89459d3183b68262 |
| institution | Directory Open Access Journal |
| issn | 1420-3049 |
| language | English |
| last_indexed | 2024-12-17T10:33:00Z |
| publishDate | 2018-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Molecules |
| spelling | doaj.art-f6438415b7ee4ede89459d3183b682622022-12-21T21:52:29ZengMDPI AGMolecules1420-30492018-10-012311275210.3390/molecules23112752molecules23112752The Effect of Enzymolysis on Performance of Soy Protein-Based AdhesiveYantao Xu0Yecheng Xu1Yufei Han2Mingsong Chen3Wei Zhang4Qiang Gao5Jianzhang Li6Key Laboratory of Wood Material Science and Utilization, Beijing Forestry University, Beijing 100083, ChinaKey Laboratory of Wood Material Science and Utilization, Beijing Forestry University, Beijing 100083, ChinaKey Laboratory of Wood Material Science and Utilization, Beijing Forestry University, Beijing 100083, ChinaKey Laboratory of Wood Material Science and Utilization, Beijing Forestry University, Beijing 100083, ChinaKey Laboratory of Wood Material Science and Utilization, Beijing Forestry University, Beijing 100083, ChinaKey Laboratory of Wood Material Science and Utilization, Beijing Forestry University, Beijing 100083, ChinaKey Laboratory of Wood Material Science and Utilization, Beijing Forestry University, Beijing 100083, ChinaIn 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.https://www.mdpi.com/1420-3049/23/11/2752soy protein isolatebromelaintriglycidylamineviscositywater resistanceadhesive |
| spellingShingle | Yantao Xu Yecheng Xu Yufei Han Mingsong Chen Wei Zhang Qiang Gao Jianzhang Li The Effect of Enzymolysis on Performance of Soy Protein-Based Adhesive Molecules soy protein isolate bromelain triglycidylamine viscosity water resistance 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 | soy protein isolate bromelain triglycidylamine viscosity water resistance adhesive |
| url | https://www.mdpi.com/1420-3049/23/11/2752 |
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