Study on Microwave-assisted Extraction and Conventional Extraction Astragalus-polysaccharose by Orthogonal Design

Objective:Comparative study on extracting astragalus-polysaccharose from conventional extraction and microwave-assisted by water.Methods:Orthogonal test was used,Polysaccharide content was determined with anthrone-sulphuric acid colorimetry.Results:The optimum conventional extraction procedure was as fallow:12 times of water decocting 60 min,2 times,the polysaccharide extraction rate was 89.34%;The optimum microwave-assisted extraction procedure was:12 times of water abstraction 15 min,microwave irradiation(800W)2 times,the extraction rate was 93.02%.Conclusion:The microwave technique could be a better method for polysaccharides extraction in the Radix astragali.