| 李 蕊,杨桂花,吕高金,陈嘉川,张 磊.玉米秸秆半纤维素的逐级分离及其结构表征[J].中国造纸学报,2017,32(3):1-6 |
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| Separation and Characterization of Hemicelluloses of Corn Stalks |
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| DOI：10.11981/j.issn.1000-6842.2017.03.1 |
| Key Words:corn stalk hemicellulose separation structural characterization |
| Fund Project:国家自然科学基金（31370580,31470602,31670595）；山东省重大科技专项（2014ZZCX09101）;泰山学者工程专项经费。 |
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| Abstract: |
| Holocellulose obtained by dewaxing and delignification of corn stalks were sequentially extracted and fractionated with different solvent systems to separate hemicelluloses. The chemical structures of the separated hemicelluloses were characterized. The results showed that the obtained hemicelluloses yields were 5.8%, 0.3%, 24.4%, 38.6%, 7.1% and 12.2% of total hemicellulose in corn stalk, respectively, after extracting sequentially by dimethyl sulfoxide, dioxane-triethylamine, saturated barium hydroxide, 1 mol/L KOH, 1 mol/L NaOH, and 3 mol/L KOH. The analysis of HPAEC, FT-IR, 1H-NMR and 13C-NMR indicated that the branching degree of hemicelluloses extracted by dimethyl sulfoxide and dioxane-triethylamine was high, while that of hemicelluloses extracted by inorganic alkali system was lower. The backbone chain of the hemicelluloses extracted by dimethyl sulfoxide was β-D-xylose with acetyl group, and the branched chains were L-Arabia sugar and 4-O-methyl glucose uronic acid. TGA analysis showed that the thermal stabilities of the hemicelluloses extracted by inorganic alkali were better than that of the hemicelluloses extracted by organic solvent. |
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