STUDIES ON THE HEMICELLULOSES OF THE BAMBOO SPECIES PHYLLOSTACHYS INCARNATA WEN
Seven hemicellulosic fractions were isolated by sequential treatments of the dewaxed bamboo with distilled water, 0.5％ and 1％ NaOH, 60％ ethanol containing 1％ NaOH, and 3％, 5％ and 8％ NaOH with a solid to liquid ratio of 1:20 (g/ml) at 60 oC for 3 h. The yields of these fractions were 1.19, 1.85, 2.82, 1.75, 7.93, 2.95, and 1.52％ (％ dry matter, w/w), respectively, of the initial amount of bamboo, which together accounted for 80.1％ of total available hemicelluloses. Sugar composition studies showed that the water-soluble hemicelluloses consisted mainly of glucose, while xylose and arabinose were the major sugars in the alkali-soluble hemicelluloses. Moreover, the molecular weights of these polymers varied between 3760 and 36000 g/mol. Furthermore, the structure of the polysaccharides in the two fractions obtained from 3％ and 8％ NaOH were determined by 1H and 13C NMR spectroscopy along with 2D 1H-13C heteronuclear correlation techniques. It was found that the bamboo hemicelluloses are O-acetyl-(4-O-methylglucurono)-arabinoxylans, and their structural element could be first identified as below: →4)4-O-Me-α-D-GlcpA-(1→2)2-O-Ac2,3-di-OAc α-L-Araf-(1→2)α-L-Araf-(1→3)β-s-D-Xylp-(1 →.
bamboo hemicelluloses isolation structure characterization
Peng Pai Peng Feng Bian Jing Xu Feng Sun Runcang
State Key Laboratory of Pulp and Paper Engineering,South China University of Technology, Guangzhou,5 State Key Laboratory of Pulp and Paper Engineering,South China University of Technology, Guangzhou,5 Institute of Biomass Chemistry and Technology,Beijing Forestry University, Beijing, 100083, China
国际会议
广州
英文
265-268
2010-11-08（万方平台首次上网日期，不代表论文的发表时间）