Zhao Jian, Li Xuezhi, Qu Yinbo, Gao Peiji
State Key Laboratory of Microbial Technology, Shandong University, Jinan, 250100, P.R. China.
Appl Biochem Biotechnol. 2004 Jan;112(1):13-23. doi: 10.1385/abab:112:1:13.
Alkaline peroxide mechanical pulping (APMP) of wheat straw with enzyme treatment was studied. Instead of direct enzyme pretreatment on wheat straw, an alternative treatment method was used, in which coarse pulps from refiner defibrated wheat straw rather than wheat straw were pretreated with a crude enzyme containing mainly xylanase, then impregnated with alkaline H2O2 solution and further refined. The optimum conditions of enzyme treatment were xylanase dosage of 10-15 IU/g of oven-dried wheat straw, 90 min, 50-60 degrees C, pulp consistency of 5-10%, and initial pH of 5.0, and those for chemical impregnation were 6% NaOH, 70-80 degrees C, 60-90 min, and 4 to 5% H2O2. Enzyme treatment improved pulpability of wheat straw by the APMP process, and final pulp quality such as brightness, breaking length, and burst index of pulp. Pulp from the APMP process with enzyme treatment could be bleached to a brightness of 70.5% ISO by two-stage H2O2 bleaching sequence with only 4% H2O2, and breaking length of the bleach pulp reached 4470 m
研究了酶处理对麦草碱性过氧化氢机械法制浆（APMP）的影响。采用了一种替代处理方法，不是直接对麦草进行酶预处理，而是用主要含木聚糖酶的粗酶对磨浆机解纤后的麦草粗浆而非麦草进行预处理，然后用碱性过氧化氢溶液浸渍并进一步磨浆。酶处理的最佳条件为：木聚糖酶用量10 - 15 IU/g绝干麦草、90分钟、50 - 60℃、纸浆浓度5 - 10%、初始pH值5.0；化学浸渍的最佳条件为：6% NaOH、70 - 80℃、60 - 90分钟、4 - 5% H2O2。酶处理提高了麦草在APMP制浆过程中的制浆性能以及最终纸浆质量，如纸浆的亮度、裂断长和耐破指数。经酶处理的APMP制浆工艺所得纸浆采用两段过氧化氢漂白工艺，仅用4% H2O2即可漂至70.5% ISO的亮度，漂白浆的裂断长达到4470米
