Back to Search
Start Over
Physicochemical characterisation of residual hemicelluloses isolated with cyanamide-activated hydrogen peroxide from organosolv pre-treated wheat straw
- Source :
-
Bioresource Technology . Aug2005, Vol. 96 Issue 12, p1342-1349. 8p. - Publication Year :
- 2005
-
Abstract
- Abstract: Seven residual hemicellulosic preparations (19.6–45.0% of the original hemicelluloses) were extracted from wheat straw pre-treated with various organic solvents using 1.8% H2O2–0.18% cyanamide at 50°C and pH 10.0 for 4h. Their chemical compositions and physicochemical properties were determined using GC, HPLC, GPC, FT-IR and 13NMR spectroscopy. The results indicated that all the residual hemicellulosic preparations were heteropolysaccharides containing xylose, glucose, arabinose, galactose, mannose, rhamnose and 4-O-methyl-α-d-glucopyranosyluronic acid. The predominant monosaccharide was xylose, ranging between 67.7% and 81.9% of the total neutral sugars, composed mainly of l-arabino-(4-O-methyl-d-glucurono)-d-xylan. The content of contaminant lignin in the isolated residual hemicelluloses was 2.89–5.31%. The M w values of the two residual hemicellulosic preparations H6 and H7 (42,710 and 44,080gmol−1, respectively) obtained from the aqueous-alcohol pre-treated straw were much higher than those of H1–H5 (12,980–15,950gmol−1) extracted from the organic acid pre-treated straw. [Copyright &y& Elsevier]
- Subjects :
- *HEMICELLULOSE
*HYDROGEN peroxide
*DISINFECTION & disinfectants
*ORGANIC compounds
Subjects
Details
- Language :
- English
- ISSN :
- 09608524
- Volume :
- 96
- Issue :
- 12
- Database :
- Academic Search Index
- Journal :
- Bioresource Technology
- Publication Type :
- Academic Journal
- Accession number :
- 17545823
- Full Text :
- https://doi.org/10.1016/j.biortech.2004.11.018