Study on optimization of microwave-assisted extraction of polysaccharide from Lycium barbarum and research of its antioxidizability

Response surface analysis method was used to optimize microwave extraction of polysaccharide from Lycium barbarum.Results showed that the best extraction conditions were as follows:the highest yield(9.57%(w/w))of the polysaccharide was obtained under 300W of microwave power for 1.8min at solution-solid ratio of 26∶1(mL/g).The DPPH· clearance rate of the polysaccharide yielded under optimum conditions was 5% lower than BHA(0.1mg/mL concentration except),but the ORAC value and reducing power of the polysaccharide were slightly higher.On the whole,its antioxidizability was close to the polysaccharide yield by water extraction.