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Composition of cell wall phenolics and polysaccharides of the potential bioenergy crop - Miscanthus.
- Source :
-
GCB Bioenergy . Aug2011, Vol. 3 Issue 4, p333-345. 13p. 1 Chart, 11 Graphs. - Publication Year :
- 2011
-
Abstract
- The composition and concentrations of cell wall polysaccharides and phenolic compounds were analyzed in mature stems of several Miscanthus genotypes, in comparison with switchgrass and reed ( Arundo donax), and biomass characteristics were correlated with cell wall saccharification efficiency. The highest cellulose content was found in cell walls of M. sinensis'Grosse Fontaine' (55%) and in A. donax (47%) and lowest (about 32%) in M. sinensis'Adagio'. There was little variation in lignin contents across M. sinensis samples (all about 22-24% of cell wall), however, Miscanthus× giganteus (M × g) cell walls contained about 28% lignin, reed - 23% and switchgrass - 26%. The highest ratios of cellulose/lignin and cellulose/xylan were in M. sinensis'Grosse Fontaine' across all samples tested. About the same total content of ester-bound phenolics was found in different Miscanthus genotypes (23-27 μg/mg cell wall), while reed cell walls contained 17 μg/mg cell wall and switchgrass contained a lower amount of ester-bound phenolics, about 15 μg/mg cell wall. Coumaric acid was a major phenolic compound ester-bound to cell walls in plants analyzed and the ratio of coumaric acid/ferulic acid varied from 2.1 to 4.3, with the highest ratio being in M × g samples. Concentration of ether-bound hydroxycinnamic acids varied greatly (about two-three-fold) within Miscanthus genotypes and was also the highest in M × g cell walls, but at a concentration lower than ester-bound hydroxycinnamic acids. We identified four different forms of diferulic acid esters bound to Miscanthus cell walls and their concentration and proportion varied in genotypes analyzed with the 5-5-coupled dimer being the predominant type of diferulate in most samples tested. The contents of lignin and ether-bound phenolics in the cell wall were the major determinants of the biomass degradation caused by enzymatic hydrolysis. [ABSTRACT FROM AUTHOR]
- Subjects :
- *PLANT cell walls
*PHENOLS
*POLYSACCHARIDES
*MISCANTHUS
*BIOMASS energy
*CELLULOSE
Subjects
Details
- Language :
- English
- ISSN :
- 17571693
- Volume :
- 3
- Issue :
- 4
- Database :
- Academic Search Index
- Journal :
- GCB Bioenergy
- Publication Type :
- Academic Journal
- Accession number :
- 66589660
- Full Text :
- https://doi.org/10.1111/j.1757-1707.2011.01091.x