CHARACTERIZATION OF HEMICELLULOSES ISOLATED FROM CARAGANA KORSHINSKII KOM.
In this study, hemicelluloses were fractionated into eight fractions by successive extractions with water, ethanol and different alkali concentrations from Caragana korshinskii Kom., which together accounted for 70.7％ of the original hemicelluloses. The physicochemical properties of each fraction were characterized in terms of sugar analysis, GPC, FT-IR, 1H, 13C NMR, HSQC, TGA and DTA. The results showed that 4-O-methxyl-α-D-glucurono-D-xylans were the dominant component in the Caragana korshinskii Kom. hemicelluloses. Molecular weights of the fractions ranged from 10 000 to 217 000 g/mol. Comparing all fractions, it was found that hot water released smaller sized and more branched polysaccharides, which were rich in arabinose, galactose and glucose, probably contributing to pectic substances and starch. However, adding alkali in solvent enhanced dissolution of larger molecular size polysaccharides, which were rich in xylose, principally originating from 4-O-methyl-α-D-glucuro-D-xylans.
Caragana Korshinskii Kom. hemicelluloses structure
Yang Haiyan Song Xianliang Yuan Tongqi Xu Feng Sun Runcang
Institute of Biomass Chemistry and Technology,Beijing Forestry University, Beijing, 100083, China Institute of Biomass Chemistry and Technology,Beijing Forestry University, Beijing, 100083, China St
国际会议
广州
英文
93-96
2010-11-08（万方平台首次上网日期，不代表论文的发表时间）