Abstract:The Nostoc flagelliform polysaccharide was extracted by hot water and the best extraction conditions were determined. The optimal temperature, ratio of water to algae (v/w), time, extraction times for the extraction of Nostoc flagelliform polysaccharide were 80 ℃, 90, 70 min and three times, respectively. Analysis of Nostoc flagelliform polysaccharide by UV spectrum showed that there were no absorption peaks of protein and nucleic acid at 280 nm and 260 nm, while the Fourier transform infrared spectrophotometer (FT-IR) analysis revealed that the sample has the typical characteristics of polysaccharide and was a non-sulfated polysaccharide with β-glycosides. Thermogravimetic analysis indicated that the degradation temperature of polysaccharide was 256.8 ℃.
