The invention relates to a substance which is extracted from giant knotweed for curing
diabetes mellitus and complicating diseases. By using the substance extracted from the giant knotweed, the
medicine for curing
diabetes mellitus and the complicating diseases can be produced effectively, and the treatment problems of
diabetes mellitus and the complicating diseases are solved. The substance is coarse
powder of the giant knotweed and can be prepared through the following steps: putting the giant knotweed in a round flask, adding 6 times quantity of grain
alcohol to soak the giant knotweed; refluxing and extracting and filtering the grain
alcohol, and the
reflux extraction and the filtering are carried out to medical
slag which is added with the grain
alcohol which is 6 times of the medical
slag. The filtrate water are combined for two times, the filtrate water is decompressed for recycling the grain alcohol, and the filtrate water is added in the pretreatment and reborn
macro pore adsorption resin column; the resin column is elutriated with
distilled water until the eluate is colorless, and the resin column is elutriated with the grain alcohol, the
mass concentration of which is 70 percent, the eluate is collected till the eluate does not contain any component of
anthraquinone, and the grain alcohol is recycled, and the total
anthraquinone which is the extracted substance of the giant knotweed can be gained when the eluate is volatilized on the water bath. The invention has the advantages that the preparation method of the product is scientific, the operation is easy, the quality of the total
anthraquinone which is the preparation substance is good, the purity quotient is high and the effect is good. The substance can be used for preparing the
medicine which is used for curing diabetes mellitus and the complicating diseases, and the substance which benefits mankind is a creative of the development and the application of the giant knotweed
medicine.