Journal
CARBOHYDRATE POLYMERS
Volume 101, Issue -, Pages 1191-1197Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2013.09.109
Keywords
Phyllostachys pubescens; Hemicelluloses; Steam explosion; Water impregnation; Fractionation
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Funding
- Fundamental Research Funds for the Central Universities [BLYJ201315]
- National Natural Science Foundation of China [31110103902]
- Major State Basic Research Projects of China [973-2010CB732204, 2012CB215302]
- State Forestry Administration [201204803]
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An environmentally friendly pretreatment process was developed to fractionate hemicelluloses from dried and water-immersed Phyllostachys pubescens chips by steam explosion followed with alkali and alkali/ethanol extractions. The detailed chemical and structural features of the isolated hemicellulosic fractions were comparatively investigated by HPAEC, GPC, FT-IR, C-13 NMR spectroscopies, and TGA analysis. It was found that the xylose/arabinose ratios of hemicelluloses obtained from alkali and alkali/ethanol extractions were 21.5-34.4 and 7.7-9.9, respectively, suggesting that hemicelluloses extracted with alkali had relatively lower degree of branches than those extracted with alkali/ethanol. Hemicellulosic fractions isolated from the water-immersed samples were obtained in high yields and exhibited similar compositions, which can be used as raw materials for production of value-added products. Furthermore, the hemicelluloses extracted with alkali had relatively higher molecular weight than those extracted with alkali/ethanol. In addition, an increment of incubation time resulted in a decreased thermal stability of hemicelluloses obtained from water-immersed sample. (C) 2013 Elsevier Ltd. All rights reserved.
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