氢氧化钠-硫脲-尿素水溶液高温预处理对麦草纤维酶解性能的影响研究

Effect on the Enzyme Hydrolysis Property of Wheat Straw Fibers with the Treatment of NaOH-thiourea-urea Aqueous Solution at High Temperature

利用氢氧化钠-硫脲-尿素水溶液在高温条件下处理麦草纤维,通过单因素试验探究该体系对麦草纤维酶解性能的影响情况。结果表明:在用碱量(氢氧化钠计)10%、最高温度120℃、保温时间45 min(纤维浓度20%)的条件下,该体系对麦草纤维酶解性能的改善效果最佳。在上述条件下,纤维中苯-醇抽提物、灰分、木质素和综纤维素的脱除率分别为65.29%、55.82%、67.80%和21.04%,同时酶解总糖含量和总糖转化率分别为45.7%和74.8%,比在相同条件下经氢氧化钠水溶液处理后纤维的相应指标增加21.5%。

The NaOH-thiourea-urea aqueous solution was used to treat the wheat straw fibers to modify the enzyme hydrolysis property at high temperature,and the effect was evaluated by single factor tests.The results showed that the alkali dosage(measured by NaOH)of 10%,the highest temperature of 120℃and the keeping time at the temperature mentioned above of 45 min(fiber concentration of 20%)were chosen as the optimal conditions.Under these conditions,the removal ratios of the organic extraction,ash,lignin and holocellulose were 65.29%,55.82%,67.80%and 21.05%respectively,and the content of the total sugar hydrolyzed in enzyme solution and the conversion ratio of the total sugar were 45.7%and 74.8%respectively,which were increased by 21.5%compared with those of the fibers treated in NaOH aqueous solution under the same treating conditions.