Requlation Of High Temperature Degradation And Enzymatic Hydrolysis Of Xylan

Xylo-oligosaccharide is a kind of good functional food additive.In order to raise utility rate of xylan in functional xylo- oligosaccharide production,using enzymatic hydrolysis residues as resources,this thesis studied on how to enhance the utilization and the efficiency of enzymatic hydrolysis of xylan,mainly involving high temperature pyrogenation and the improvement of conditions and repyrogenation or rehydrolysis of its product.The experimental results are as followed:(1)High temperature degradation could enhance the utilization of enzymatic hydrolysis residuces when the reaction conditions were 170℃,175℃and 180℃,with the increasing of reactive time and temperation,pH and averge degree of polymerization continued to decline ,while filtrate xylan yield continued to increase.For the total xylan ,the highest filtrate xylan yield could reach to 49.7% in enzymatic hydrolysis residues.Meanwhile,the loss of xylan also continued to increase with the highest loss of 34.1%.(2)The optimum treatment conditions of enzymatic hydrolysis residues as follows:degradation temperature was 175℃and degradation time was 35min.Under such conditions,filtrate xylan yield could reach to 43.2%,in which xylo-oligosaccharides (averge degree of polymerization 2～6) could reach to 37.57%.(3)HPLC illustration showed the filtrate xylan yield could increase to 43.2% after high temperature degradation,but in which xylo-oligosaccharides (averge degree of polymerization 2～6) were comparatively lower with the highest proportiof 37.57% in filtrate xylan.Through the rehydrolysis of filtrate xylan after high temperature pyrogenation,xylo-oligosaccharides increased obviously with the highest proportion of effective components-xylobiose and...