Process Optimization of Microwave-assisted Extraction of Polysaccharide from Portulaca oleracea

In order to optimize the microwave-assisted extraction process of polysaccharide from P.oleracea,a single-factor test and an orthogonal test were conducted to explore the effects of liquid-solid ratio,microwave processing time and microwave power on the polysaccharide extraction rate.The results showed that the optimum conditions for microwave-assisted extraction of polysaccharide from P.oleracea were as follows: liquid-solid ratio 35∶1(mL∶g),microwave processing time 15 min and microwave power 540 W.The extraction rate could be up to 11.69% under these conditions.Compared with water extraction,microwave-assisted extraction saved extraction time(40 min) and improved the extraction rate(8.69%).