Abstract: The microwave-assisted extraction technology for astragalus polysaccharide was studied‚with water as the extraction solvent．The optimal extraction conditions were obtained as follows： the ratio of water to the material‚12∶1；pH value‚9‚regulated by saturated limewater；two doses of microwave radiation （300☞W） for10min．Precipitate was obtained after the extracted liquor was concentrated in vacuum and blended with ethanol．The crude product of as-tragalus polysaccharide with the yield of14．6％ and the purity of88．1％ was then obtained after the precipitate was washed with ethanol for several times and dried in vacuum．It is found that‚compared with the direct -heating extrac-tion‚the microwave-assisted extraction can shorten the extraction duration‚reduce the consumption of the solvent and improve the yield of astragalus polysaccharide．

Key words: astragalus polysaccharide, microwave-assisted extraction, extraction technology