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| Isolation and Characterization of Corn Stover Hemicellulose |
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| DOI：10.11981/j.issn.1000-6842.2011.03.26 |
| Key Words:corn stover; hemicellulose; ion chromatography; thermogravimetric analysis |
| Fund Project:本课题为国家重点基础研究发展计划资助项目（编号2007CB210201）。 |
| Author Name | Affiliation | | 程合丽 | 华南理工大学制浆造纸工程国家重点实验室，广东广州，510640 | | 詹怀宇* | 华南理工大学制浆造纸工程国家重点实验室，广东广州，510640 | | 李兵云 | 华南理工大学制浆造纸工程国家重点实验室，广东广州，510640 | | 付时雨 | 华南理工大学制浆造纸工程国家重点实验室，广东广州，510640 |
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| Abstract: |
| Hemicellulose was extracted from corn stover with potassium hydroxide, and the main composition and structure of the hemicellulose were studied，and thermogravimetric analysis was carried out to investigate its thermal stability. Results showed that KOH solution is an effective solvent for the dissolution of corn stover hemicellulose, almost 95% of the total hemicellulose was extracted when using 80 g/L KOH at 75℃ for 2h，among which 75.6% was xylan, the main component of corn stover hemicellulose. Besides, arabinan, glucan and galactan were also detectable. Molecular weight of the hemicellulose determined by gel permeation chromatography was 53431, with the polydispersity of 1.07. NMR and FT-IR analysis suggested the structure of the hemicelluloses from corn stover was assumed to be an arabinoxylan mainly consisting of (1→4)-β-D-xylan backbone substituted in hydroxy groups at C2 and/or C3 by single α-L-arabinose residue, single α-D-glucuronic acid residue. In addition, the (1→4)-linked β-D-xylopyranosyl residues in the backbone may contain substituted phenolic acids. Thermal analysis suggested that the decomposition temperature of hemicellulose was 190~350℃ and the maximum weight loss rate was 0.89%/℃, happened at 267℃. |
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