In this study,the fermented wine of noni fruit was used as the raw material to prepare noni polysaccharide solution by hot water extraction.With the degradation rate as the index,and the noni polysaccharide concentration,the electron beam irradiation intensity and the irradiation tempera-ture as the influencing factors,the best process of treating noni polysaccharide solution by electron beam irradiation was obtained through single factor and orthogonal tests.The optimal process parameters were as follows:the noni polysaccharide concentration was 80 mg/L,the irradiation intensity was 30 kGy,and the irradiation temperature was 80℃.The degradation rate of noni polysaccharide solution was 71.23％.When the concentration of nori polysaccharide was 90 mg/L,the scavenging rate of DPPH,·OH,and O2-·free radicals was 59.7％,66.8％,and 68.2％,respectively.Nori poly-saccharide solution treated by electron beam irradiation has strong ability to scavenge DPPH,·OH,and O2-·free radicals.
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