Extraction and structure analysis on polysaccharide of Dendrocalamus farinosus culm

The polysacchride was extracted from Dendrocalamus farinosus culms with hot water,and precipitated by ethanol. The polysacchride was composed of glucose,arabinose,xylose,galactose and mannose with the contents of 40.57%,21.88%,19.89%,17.5% and 0.15% respectively by high performance ion chromatography(HPIC). The average molecular weights(Mw) of the polysacchride was 16900 u and the polydispersity was 1.33.Infrared spectrogram showed that the polysacchride had the characteristic absorption peak of polysaccharides.1HNMR and13 CNMR indicated that its main chains were composed of β-pyranglycoside linkage. Thermal analysis showed that the polysacchride fraction began to degrade at 240 ℃ and the degradation ended at