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[Objective]To select the extraction technology of polysaccharides from Gracilaria lamaneiformis and to investigate its antioxidation.[Methods]The extraction technology of polysaccharides from G.lamaneiformis and its antioxidation were researched by response surface method.The microwave-assisted extraction of polysaccharides from G.lamaneiformis was optimized based on response surface method.[Results]The optimal extraction technology of microwave-assisted extraction was as follows:495 W microwave power,1∶100 solid-liquid ratio and17 min extraction time.Under this condition,the extraction rate of polysaccharides from G.lamaneiformis was 33.11%.The regression equation of the extraction rate of polysaccharides from G.lamaneiformis(Y)was Y=22.00+6.78A+1.15B+3.63C+0.82AB+2.97AC+0.37BC-0.52A2-1.86B2-2.26C2.Results of the antioxidation of polysaccharides showed that polysaccharides had certain clearance effects on DPPH free radical.[Conclusion]This optimized model had extremely significant regression and relatively good fitting,which was of certain application value
[Objective] To select the extraction technology of polysaccharides from Gracilaria lamaneiformis and to investigate its antioxidation. [Methods] The extraction technology of polysaccharides from G. lamaneiformis and its antioxidations were researched by response surface method. The microwave-assisted extraction of polysaccharides from G .lamaneiformis was optimized based on response surface method. [Results] The optimal extraction technology of microwave-assisted extraction was as follows: 495 W microwave power, 1: 100 solid-liquid ratio and 17 min extraction time. Under this condition, the extraction rate of polysaccharides from G. lamaneiformis was 33.11%. The regression equation of the extraction rate of polysaccharides from G. lamaneiformis (Y) was Y = 22.00 + 6.78A + 1.15B + 3.63C + 0.82AB + 2.97AC + 0.37BC- 0.52 A2-1.86B2-2.26C2.Results of the antioxidation of polysaccharides showed that polysaccharides had certain clearance effects on DPPH free radical. [Conclusion] This optimized model had extremely significant r egression and relatively good fitting, which was of certain application value