BIOLOGICAL ENZYME PRETREATMENT APPLIED TO EXTRACTION OF RICE STRAW FIBER

Xylanase and pectinase were respectively used in the pretreatment of rice straw degumming.We analyzed the influence of biological enzymes on the properties of rice straw fibers.Based on the fibrous residue rate,fineness,strength and flexibility,we obtained the relative optimal process parameters of these two enzymes treatment.The optimization of xylanase pretreatment process is as follows:xylanase dosage of 10%(owf),temperature of 50 ℃,time of 10 h,pH value of 9 and liquor ratio of 1 ∶30;the optimization of pectinase pretreatment process is as follows: pectinase dosage of 8%(owf),temperature of 45℃,time of 8 h,pH value of 5 and liquor ratio of 1∶30.Compared with separate chemical degumming,biological enzyme pretreatment can effectively improve the rice straw fiber fineness,softness and other properties.Meanwhile,the properties of extracted fibers using xylanase pretreatment process is better than that of using pectinase.