Method for extracting and purifying bracteatum polysaccharide with blood sugar regulation activity

The invention relates to a method for extracting and purifying bracteatum polysaccharide with blood sugar regulation activity, belonging to the field of deep-processing technology of functional plant polysaccharide. In the method, bracteatum leaves are taken as raw materials, and the method comprises the steps of: grinding and carrying out water extraction and alcohol precipitation on the raw material; separating and purifying by macroporous resin and gel chromatography; and finally, verifying the activity by pancreas islet beta-cell membrane chromatographic column to obtain the bracteatum polysaccharide with blood sugar regulation activity. The method is scientific and reasonable in technology and design and is capable of effectively separating and purifying the polysaccharide with blood sugar regulation activity, thus improving development and utilization of bracteatum resource, and providing the basis for the development of the plant polysaccharide.