Analysis of the Structural Aspects of Tannin-Based Adhesives by 2D-NMR
We developed non-toxic, harmless adhesives composed of all-natural and renewable resources, of which one was composed of tannin and gelatin, which unfortunately was lacking water resistance, and the other of tannin and ε-poly-<span style="font-variant: small-caps;">l</span>-lys...
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-09-01
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| Series: | Materials |
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| Online Access: | https://www.mdpi.com/1996-1944/14/19/5479 |
| _version_ | 1797516105762209792 |
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| author | Sachikazu Omura Yoshinori Kawazoe Daisuke Uemura |
| author_facet | Sachikazu Omura Yoshinori Kawazoe Daisuke Uemura |
| author_sort | Sachikazu Omura |
| collection | DOAJ |
| description | We developed non-toxic, harmless adhesives composed of all-natural and renewable resources, of which one was composed of tannin and gelatin, which unfortunately was lacking water resistance, and the other of tannin and ε-poly-<span style="font-variant: small-caps;">l</span>-lysine. In this study, we analyzed the chemical structures of these adhesives by two-dimensional nuclear magnetic resonance (2D-NMR) to explain the difference in water-resistance of the two glues. The results showed that only one proton was left in the benzene ring of tannin after mixing. This suggests that the amino group of the protein was directly attached to the benzene ring by a Michael addition-type reaction, and not to the hydroxyl group. In addition, the heteronuclear multiple bond correlation spectrum of the tannin-poly-<span style="font-variant: small-caps;">l</span>-lysine compound indicated that the hydroxyl groups of the tannin oxidized, suggesting the improvement of its water resistance. |
| first_indexed | 2024-03-10T06:56:38Z |
| format | Article |
| id | doaj.art-12fd44be580f45b79043b4b722ad85b0 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T06:56:38Z |
| publishDate | 2021-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-12fd44be580f45b79043b4b722ad85b02023-11-22T16:22:28ZengMDPI AGMaterials1996-19442021-09-011419547910.3390/ma14195479Analysis of the Structural Aspects of Tannin-Based Adhesives by 2D-NMRSachikazu Omura0Yoshinori Kawazoe1Daisuke Uemura2Institute of Natural Drug-Leads, Kanagawa University, Hiratsuka 259-1293, Kanagawa, JapanCenter for Education and Research in Agricultural Innovation, Faculty of Agriculture, Saga University, Karatsu 847-0021, Saga, JapanInstitute of Natural Drug-Leads, Kanagawa University, Hiratsuka 259-1293, Kanagawa, JapanWe developed non-toxic, harmless adhesives composed of all-natural and renewable resources, of which one was composed of tannin and gelatin, which unfortunately was lacking water resistance, and the other of tannin and ε-poly-<span style="font-variant: small-caps;">l</span>-lysine. In this study, we analyzed the chemical structures of these adhesives by two-dimensional nuclear magnetic resonance (2D-NMR) to explain the difference in water-resistance of the two glues. The results showed that only one proton was left in the benzene ring of tannin after mixing. This suggests that the amino group of the protein was directly attached to the benzene ring by a Michael addition-type reaction, and not to the hydroxyl group. In addition, the heteronuclear multiple bond correlation spectrum of the tannin-poly-<span style="font-variant: small-caps;">l</span>-lysine compound indicated that the hydroxyl groups of the tannin oxidized, suggesting the improvement of its water resistance.https://www.mdpi.com/1996-1944/14/19/5479adhesivetanningelatinpoly-<span style="font-variant: small-caps">l</span>-lysinestructure determination2D-NMR |
| spellingShingle | Sachikazu Omura Yoshinori Kawazoe Daisuke Uemura Analysis of the Structural Aspects of Tannin-Based Adhesives by 2D-NMR Materials adhesive tannin gelatin poly-<span style="font-variant: small-caps">l</span>-lysine structure determination 2D-NMR |
| title | Analysis of the Structural Aspects of Tannin-Based Adhesives by 2D-NMR |
| title_full | Analysis of the Structural Aspects of Tannin-Based Adhesives by 2D-NMR |
| title_fullStr | Analysis of the Structural Aspects of Tannin-Based Adhesives by 2D-NMR |
| title_full_unstemmed | Analysis of the Structural Aspects of Tannin-Based Adhesives by 2D-NMR |
| title_short | Analysis of the Structural Aspects of Tannin-Based Adhesives by 2D-NMR |
| title_sort | analysis of the structural aspects of tannin based adhesives by 2d nmr |
| topic | adhesive tannin gelatin poly-<span style="font-variant: small-caps">l</span>-lysine structure determination 2D-NMR |
| url | https://www.mdpi.com/1996-1944/14/19/5479 |
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