毛竹竹青和竹黄半纤维素的提取与结构表征

doi:10.3969/j.issn.0253-2417.2015.05.006

Abstract

Abstract: Bamboo green and bamboo yellow separated from Moso bamboo residues were delignified by NaClO₂ after grinded, sifted and dewaxed by toluene-ethanol to achieve holocellulose. The resulted holocellulose was constantly extracted with 1%, 5% and 10% KOH to obtain hemicellulose. The yields of hemicellulose acquired from bamboo green and bamboo yellow were calculated as 81.74% and 85.36%, respectively. Then, the chemical compositions and structures of these hemicelluloses were characterized by HPAEC, GPC, FT-IR, ¹H NMR and 2D HSQC techniques. The results indicated that the proportions of xylose in the bamboo green and bamboo yellow hemicellulose preparations were 61.02%-73.76% and 65.22%-80.00%, respectively. The weight average molecular weight of hemicellulose preparations of bamboo yellow were 44 870-48 560 g/mol, which were higher than that of bamboo green hemicellulose preparations (43 970-46 245 g/mol). It was demonstrated that the back chain of hemicelluloses were composed of β-D-xylan. Meanwhile, α-L-arabinofuranose and 4-O-methyl-α-D-glucuronic acid were linked to back chain of hemicellulose at C-3 and C-2 of xylan, respectively, and part of lignins were linked to hemicelluloses by phenyl glucoside bond.

Key words: bamboo green, bamboo yellow, hemicellulose, characterization, NMR

CLC Number:

TQ35

HUANG Cao-xing, HE Juan, MIN Dou-yong, LI Xin, YONG Qiang. Isolation and Characterization of Hemicellulose from Moso Bamboo Green and Bamboo Yellow[J]. Chemistry and Industry of Forest Products, 2015, 35(5): 29-36.

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Isolation and Characterization of Hemicellulose from Moso Bamboo Green and Bamboo Yellow

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