Effect of Enzyme Pretreatment on Alkali Extraction of Hemicellulose of Straw Fiber

Hemicellulose is an important composition of biomass.Wheat straw has a large potential in comprehensive utilization,and we can convert it into high value-added and multiple products.To obtain higher yields of hemicellulose from wheat straw,during the conversion,pretreatment was a key technique.The experiment used the method of xylanase pretreatment and alkali extraction.The effect of xylanase pretreatment on alkali extraction was analyzed.The results showed that the optimal extraction conditions were NaOH concentration 7%,temperature 70 ℃ before xylanase pretreatment,while the optimal extraction conditions were NaOH concentration 7%,temperature 60 ℃ after xylanase pretreatment,and the xylanase pretreatment was benifical for the extraction of hemicellulose.On the other side,the fines and parenchyma cells became less after xylanase pretreatment.