中文摘要：

利用低纤维素酶活木聚糖酶对麦草浆进行预处理，研究木聚糖酶在氯、碱、次氯酸盐（CEH）三段漂白中对氯气用量的减少以及对漂白过程中纸浆木质纤维组分变化的影响。结果表明：经过木聚糖酶预处理，在保证纸浆漂后白度的同时，氯气用量可以减少50％；木聚糖酶预处理对纸浆中的木素有脱除作用，且能促进木素在碱抽提过程中的溶出，但木聚糖酶对戊聚糖和纤维素也有不同程度的降解作用；酶处理浆漂后的木素和半纤维素的含量略低于未经处理的对照浆，纤维素含量则略高于对照浆。

英文摘要：

Cellulase-poor xylanase was used to pretreat wheat straw pulp in order to study its reduction effects on the Cl2 consumption and its influence on the variation of lignocellulosic components during CEH bleaching process. The results indicated： After xylanase pretreatment,the Cl2 dosage could be decreased by 50% without affecting the targeted brightness. Xylanase pretreatment had removal effects on lignin of the pulp and could boost the dissolving of lignin during alkali extraction process. However, xylanase showed various degrees of depolymerization on pentosane and cellulose. The final lignin and pentosane content after bleaching of the enzyme-treated pulp were slightly lower than that of the control, whereas cellulose content was a little higher than that of the control.