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STRUCTURE OF HEMICELLULOSES UPON MATURATION OF BAMBOO (Neosinocalamus affinis) CULMS

Articles

Journal/Conference:

CELLULOSE CHEMISTRY AND TECHNOLOGY

Language:

English

Year:

2016

Volume:

50

Issue:

2

Pages:

189-198

Keywords:

Neosinocalamus affinis bamboo; DMSO-soluble hemicelluloses; structural characterization; maturation; starch

The DMSO-soluble hemicelluloses were obtained from the delignified one-, two-, and three-year-old bamboo (Neosinocalamus affinis) culms. Chemical composition analysis showed that the content of carbohydrates, lignin, extractives, and ash for differently aged bamboo culms had relatively small differences. The yields of hemicelluloses ranged from 6.53% to 9.78% of the holocellulose by the DMSO extraction. The GPC analysis revealed that the hemicelluloses had relatively high molecular weight and low polydispersity index, which indicated that they had a lower degree of degradation under the treatment with DMSO. The degree of acetylation values provided evidence indicating that DMSO-soluble hemicelluloses were highly acetylated. Based on the analysis of HPAEC, GPC, FT-IR, and NMR, the structure of bamboo hemicelluloses was barely changed during its maturation. The DMSO-soluble hemicelluloses mainly consisted of O-acetyl-arabino-4-O-methylglucurono-(1 -> 4)-beta-D-xylan, while relatively higher starch content was present in the DMSO-soluble fractions of the three-year-old bamboo culms.