Abstract:

Various pretreatments for the sweet sorghum straw were carried out, including mechanical processing、 heat treatment、 ultrasonic treatment、inorganic solvent treatment, and organic solvent treatment. The influence of the different pretreatment on the efficiency of the enzymatic degradation of the sweet sorghum straw cellulose was compared. The efficiency was analyzed as the following order: temperature ＞ ultrasonic ＞ organic solvent ＞ mechanical treatment ＞ acids/base in lower concentration.. In the heat treatment the drying and high temperature treatment condition shows the best efficiency with the result of each 0.1g of straw powder producing 8.3116 mg reducing sugar. Ultrasonic treatment in the absence of solvent (water) conditions produced more reducing sugar with the factor of 5 than in the presence of solvent (water) in the same time. In the organic solvent treatment acetone shows the best efficiency in which 0.1 grams of straw powder can produce 4.3736mg reducing sugar in 30 minutes. In the mechanical treatment the amount of reducing sugar increased with the increasing of the crushed mesh number. The results provided valuable suggestions for the industrial producing.