期刊
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
卷 61, 期 10, 页码 2434-2445出版社
AMER CHEMICAL SOC
DOI: 10.1021/jf304686x
关键词
coconut coir; lignin; Py-GC/MS; TMAH; HSQC; DFRC; thioacidolysis; p-hydroxybenzoates; tricin
资金
- CSIC project [201040E075]
- EU-project LIGNODECO [KBBE-244362]
- CSIC
- Fondo Social Europeo (FSE)
- DOE Great Lakes Bioenergy Research Center (DOE Office of Science) [BER DE-FC02-07ER64494]
- [AGL2011-25379]
The structure of the isolated milled wood lignin from coconut coir has been characterized using different analytical methods, including Py-GC/MS, 2D NMR, DFRC, and thioacidolysis. The analyses demonstrated that it is a p-hydroxyphenyl-guaiacyl-syringyl (H-G-S) lignin, with a predominance of G units (S/G ratio 0.23) and considerable amounts of associated p-hydroxybenzoates. Two-dimensional NMR indicated that the main substructures present in this lignin include beta-O-4' alkyl aryl ethers followed by phenylcoumarans and resinols. Two-dimensional NMR spectra also indicated that coir lignin is partially acylated at the gamma-carbon of the side chain with p-hydroxybenzoates and acetates. DFRC analysis showed that acetates preferentially acylate the gamma-OH in S rather than in G units. Despite coir lignin's being highly enriched in G-units, thioacidolysis indicated that beta-beta' resinol structures are mostly derived from sinapyl alcohol. Finally, we find evidence that the flavone tricin is incorporated into the coconut coir lignin, as has been recently noted for various grasses.
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