Dendrocalamus sinicus, which is the largest bamboo species in the world, has broad prospects in biomass-energy and biorefinery applications. In this study, five soluble hemicellulose fractions were sequentially isolated with 80% ethanol containing 0.025 M HCl, 80% ethanol containing 0.5% NaOH, and alkaline aqueous solutions (containing 2.00, 5.00, and 8.00% NaOH, respectively) at 75� C for 4 h from dewaxed D. sinicus, and their structural properties were examined. Gel permeation chromatography revealed that the hemicelluloses isolated from D. sinicus show a wide distribution of molecular weight. The hemicelluloses isolated by ethanol had lower weight-average molecular weights (17380-19620 g/mol), while the hemicelluloses isolated by alkaline aqueous solutions had relatively higher weight-average molecular weights (22510-42150 g/mol). Neutral sugar analysis indicated that the soluble hemicelluloses were mainly composed of arabinoglucuronoxylans, followed by minor amounts of �-glucan and starch. Spectroscopic analyses suggested that the isolated arabinoglucuronoxylans from bamboo (D. sinicus) could be defined as a linear (1?4)-�-linked-xylopyranosyl backbone to which a-L-arabinofuranose units and/or short chains of 4-O-methyl-glucuronic acid were attached as side residues via a-(1?3) and/or a-(1?2) linkages. The results obtained from the research provide basic and necessary scientific information for conversion of bamboo biomass to biorefinery.

Fractionation and characterization of hemicellulosic polysaccharides from <i>Dendrocalamus sinicus</i>

245th National Meeting (2013)

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Fractionation and characterization of hemicellulosic polysaccharides from Dendrocalamus sinicus