摘要
探讨了以玉米芯为碳源制备木聚糖酶及麦草化学机械浆经该木聚糖酶预处理后可漂性和白度的改善效果。结果表明 ,直接以玉米芯为底物、里氏木霉为菌种产酶效果较好 ,当底物浓度为 18g/L时 ,木聚糖酶活力可达 38.34IU/mL。木聚糖酶预处理有利于改善麦草化机浆的可漂性 ,促进其过氧化氢漂白 ,有效提高漂白浆白度 ,降低漂剂消耗。研究表明 ,当经单段H2 O2 漂至相同白度时 ,木聚糖酶预处理后可节约 50 %的H2 O2 用量。若麦草CMP酶处理后采用高浓两段过氧化氢漂白 ,即XP3 P3 漂序 (H2 O2 总量为 6 % )时 ,白度可达 6 0 % (ISO)
Xylanase from Trichoderma ressei Rut C 30 with corncob meal as carbon source was prepared and improvement of bleachability and brightness of wheat straw CMP by xylanase pretreatment were investigated. The results indicated that the activity of xylanase was up to 38.34 IU/mL with 18 g/L(oven dry weight)corncob as the substrate. The xylanase treatment was beneficial to improving the bleachability of wheat straw CMP, enhancing hydrogen peroxide bleaching, increasing the brightness effectively and decreasing the consumption of bleaching agent. The research showed that 50% hydrogen peroxide was saved after enzymic pretreatment when wheat straw CMP was bleached to the same brightness with one stage H 2O 2. Furthermore if wheat straw CMP was bleached with two stage high consistence hydrogen peroxide after enzymatic pretreatment, namely XP 3P 3(total H 2O 2 6%)bleaching sequence, the brightness could be over 60%(ISO).
出处
《林产化学与工业》
EI
CAS
CSCD
2001年第1期21-28,共8页
Chemistry and Industry of Forest Products
基金
中国林业科学研究院科学技术发展基金资助项目! (0 0 89113)
