Back to Search
Start Over
Elucidating Tricin-Lignin Structures: Assigning Correlations in HSQC Spectra of Monocot Lignins
- Source :
- Polymers, Vol 10, Iss 8, p 916 (2018)
- Publication Year :
- 2018
- Publisher :
- MDPI AG, 2018.
-
Abstract
- Tricin [5,7-dihydroxy-2-(4-hydroxy-3,5-dimethoxyphenyl)-4H-chromen-4-one] is a flavone that has been found to be incorporated in grass lignin polymers via 4′–O–β coupling. Herein, we investigated the tricin-lignin structure using nuclear magnetic resonance (NMR) methods by comparing the 1H–13C heteronuclear correlation (HSQC) NMR spectra of the isolated lignin with a series of dimeric and trimeric tricin-4′–O–β-ether model compounds. Results showed that the tricin moiety significantly affects the chemical shift of the Cβ/Hβ of 4′–O–β unit, producing peaks at around δC/δH 82.5–83.5/4.15–4.45, that differ from the Cβ/Hβ correlations from normal 4–O–β units formed solely by monolignols, and that have to date been unassigned.
Details
- Language :
- English
- ISSN :
- 20734360
- Volume :
- 10
- Issue :
- 8
- Database :
- Directory of Open Access Journals
- Journal :
- Polymers
- Publication Type :
- Academic Journal
- Accession number :
- edsdoj.f67edaae05849dcaa6f4f6f857e826b
- Document Type :
- article
- Full Text :
- https://doi.org/10.3390/polym10080916