Abstract
In this paper, hemicelluloses from bamboo (Phyllostachys pubescens Mazel) stem aged six months were sequentially extracted with hot water, 2% KOH, and 5% NaOH. The water-soluble hemicelluloses H 1, and four alkali-soluble hemicellulosic fractions H 2, H 3, H 4 and H 5 were obtained, achieving a total yield of 59.60% based on the original hemicelluloses. Sugar composition analysis showed that the hemicelluloses were mainly composed of xylose (44.39-72.71%), arabinose (26.36-51.87%), ribose (0.93-2.72%), and uronic acid (0.29-5.27%). The structures of the hemicelluloses were determined to be mainly arabinoxylan, using the FT-IR and NMR techniques. The AFM images of fraction H 3 revealed a distribution of spherical nanoparticles with different sizes, while the fraction H 2 had helix rod and random coil feature. The SEM characterizations indicated that the fraction H 1 displayed spherical particles while the fraction H 3 had mainly flat particles at high magnification. Thermal stability was also analyzed using TG-DTG method and first-order kinetics model.
Original language | English (US) |
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Pages (from-to) | 41-50 |
Number of pages | 10 |
Journal | Industrial Crops and Products |
Volume | 37 |
Issue number | 1 |
DOIs | |
State | Published - May 2012 |
Bibliographical note
Funding Information:The authors are grateful for financial support of the Natural Science Foundation of China ( 30960304 ), of the Natural Science Foundation from Ministry of Education of Jiangxi Province of China ( GJJ10045 ), of the International Science and Technology Cooperation Programme of China ( 2010DFB63750 ) and the International Science and Technology Cooperation Programme of Jiangxi Provincial Department of Science and Technology ( 2010EHB03200 ).
Keywords
- Bamboo stem
- Hemicelluloses
- Morphological properties
- Structure