Study on Extraction of Astragalus Polysaccharide by Ultrasonic-Microwave Synergistically Assisted Technique

In this paper,we developed a new extraction method of astragalus polysaccharide using ultrasonic-microwave synergistic technique.The effects of extraction time,power of microwave and the ratio of liquid to solid were studied by single-factor and orthogonal experiments.The method was compared with traditional water extraction,microwave assisted extraction and ultrasonic assisted extraction.Optimal reaction conditions were obtained:extraction time was 150 s,power of microwave was 120 w and the ratio of solid to liquid was 1:25.The highest extraction rate of astragalus polysaccharide was 4.25% under optimal extraction conditions.The method of ultrasonic-microwave synergistical exteation is more efficient then other extraction methods.