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Changes in chemical characteristics of bamboo (Phyllostachys pubescens) components during steam explosion

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Abstract

Chemical changes in cell wall components of bamboo internode during steam explosion process were analyzed to investigate self-binding mechanism of binderless board from steam-exploded pulp. More than 30% of xylose on initial mass, which is a major hydrolyzate of bamboo hemicelluloses, was lost after steam explosion treatment. Bamboo lignin is characterized by the presence of ester- and/or ether-linked p-coumaric acid to lignin. The content of phenolic hydroxyl groups of lignin isolated from steam-exploded pulp was characterized 2.3 times higher than those of the extract-free bamboo internode due to the cleavage of β-O-4 linkages. Alkaline nitrobenzene oxidation of the bamboo lignin gave vanillin, syringaldehyde and p-hydroxybenzaldehyde as major products. The content of p-hydroxybenzaldehyde decreased after steam explosion treatment, indicating the cleavage of ester- and/or ether-linked p-coumaric acid. The total yield of erythronic and threonic acids in ozonation products of the extract-free bamboo internode lignin was 268 mmol (200 g lignin)−1, while those of lignins in the steam-exploded pulp and powdery fraction were 96 and 129 mmol (200 g lignin)−1, respectively, suggesting the significant cleavage of β-O-4 linkages during steam explosion treatment. The cleavage of β-O-4 linkages was also confirmed by 1H- and 13C-NMR spectroscopic observations.

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Acknowledgments

This work was successfully completed with the financial support of the National Natural Science Foundation of China (30671636), and Agricultural Key Research Project of Zhejiang Province of China (2006C22077).

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Correspondence to Zhenfu Jin.

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Shao, S., Wen, G. & Jin, Z. Changes in chemical characteristics of bamboo (Phyllostachys pubescens) components during steam explosion. Wood Sci Technol 42, 439–451 (2008). https://doi.org/10.1007/s00226-008-0183-8

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