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Structural Characterization of Lignocresols from Transgenic and Wild-Type Switchgrass.
- Source :
- Polymers (20734360); Jul2018, Vol. 10 Issue 7, p727, 1p, 1 Diagram, 6 Charts, 5 Graphs, 1 Map
- Publication Year :
- 2018
-
Abstract
- Cafferic acid-<italic>O</italic>-methyltransferases (COMT) down-regulated transgenic and wild-type switchgrass were separated into lignocresols (LCs) and sugars by a phase separation method involving 72% sulfuric acid and cresol. The isolated LCs were characterized by FTIR, GPC, <superscript>1</superscript>H NMR and 2D-HSQC to understand potential structural modification caused by transgenic engineering lignin or phase separation treatment. No significant changes were found in terms of molecular weights and the amount of incorporated <italic>p</italic>-cresols between transgenic and wild-type switchgrass LCs. However, the compositions, ratios of syringyl (S) units to guaiacyl (G) units, were changed significantly leading to decrease in S units and increase in G units for transgenic switchgrass LC. The benzodioxane structures and 5-hydroxyguaiacyl units were observed in the 2D-HSQC implied that 5-hydroxyconiferyl alcohol was incorporated into lignin as a result of COMT-down-regulation in the transgenic process. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 20734360
- Volume :
- 10
- Issue :
- 7
- Database :
- Complementary Index
- Journal :
- Polymers (20734360)
- Publication Type :
- Academic Journal
- Accession number :
- 131128710
- Full Text :
- https://doi.org/10.3390/polym10070727