内切木聚糖酶与木糖苷酶预处理对麦草浆漂白性能的影响

EFFECTS OF ENDO-XYLANASE AND XYLOSIDASE PRETREATMENT ON BLEACHING PROPERTIES OF WHEAT STRAW PULP

研究了内切木聚糖酶与木糖苷酶预处理对麦草浆漂白性能的影响。结果表明,无论是内切木聚糖酶还是木糖苷酶预处理漂白浆的白度均比对照浆高,分别高出对照浆的2.5和1.9个百分点,同时漂白浆的强度也好于对照浆的强度。内切木聚糖酶和木糖苷酶混合预处理漂白浆的白度分别比内切木聚糖酶和木糖苷酶高出0.9和1.5个百分点,这表明内切木聚糖酶和木糖苷酶在纸浆预处理过程中具有协同作用。通过电镜观察发现经内切木聚糖酶和木糖苷酶预处理后纸浆的表面和横断面有许多孔隙,其中经内切木聚糖酶预处理后纸浆的孔隙比木糖苷酶要多而且大。通过X 射线衍射分析发现内切木聚糖酶和木糖苷酶均不能破坏纸浆的结晶度。

Effects of endoxylanase and xylosidase pretreatment on bleaching properties of wheat straw pulp have been investigated.Results show that brightness of bleached pulp with endoxylanase and xylosidase pretreatment is increased respectively by 2.5 and 1.9 percentages greater than that of control pulp,and strength of bleached pulps is better than that of control pulp.Endoxylanase and xylosidase acted synergistically on the pretreated wheat straw pulp before its bleaching.Brightness of bleached pulp with mixture of endoxylanase and xylosidase is increased respectively by 0.9 and 1.5 percentages greater than that with endoxylanase and xylosidase pretreatment.It is found that there were many pores in the surfaces and across sections of pulp with endoxylanase and xylosidase under electronic microscope,and pores of pulp with endoxylanase pretreatment were more and larger than those with xylosidase pretreatment. It is found that endoxylanase and xylosidase could not destroy pulp crystallinity by Xray analysis.