硫酸对过氧化氢-乙酸预处理杨树单糖和低聚木糖生产的影响

The severe pretreatment of poplar makes xylan difficult to utilize efficiently. In this work, poplar was pretreated by hydrogen peroxide-acetic acid (HPAC) with H2SO4 as catalyst to remove lignin, and the solid residues were used to produce xvlooligosaccharides (XOS) and monosaccharides by two-step xylanase and cellulase hvdrolvsis.The results indicated that higher H SO4 concentrations in the HPAC pretreatment of poplar afforded stronger lignin removal ability. An increased XOS yield of 19.8% was obtained from 200 mM H SO4-catalyzed poplar by xylanase and the XOS purity was high, with a very low xylose/XOS ratio of 0.14. Higher glucose (75.2%) and xylose (61.4%) vields were obtained from the HPAC-pretreated poplar using 50 mM H,SO4 as catalyst. Finallv.16.9g XOS and 296.4 g glucose were produced from 1 kg poplar by xylanase and cellulase. This study provides a method for producing functional XOS and monosaccharides from poplar using a simple reduced-pollution strategy.