ENZYMATIC HYDROLYSIS OF CORN STALKS BY SCREW EXTRUSION STEAM EXPLOSIN
Corn stalks were broken up by screw extrusion steam explosion. The effectiveness of hydrochloric acid, alkaline peroxide, and combined alkaline peroxide and hydrochloric acid pretreatment for enzymatic hydrolysis was investigated. In this study, the reducing sugars yields from enzymatic hydrolysis of unpretreated raw materials were 24.6g/100 g raw material (>20 mesh) and 31.8 g/100 g raw material (<20 mesh). When corn stalks (>20 mesh) were pretreated by alkaline peroxide, total reducing sugars yield from enzymatic hydrolysis was 60.8 g/100 g raw material. When this pretreatment method was combined with hydrochloric acid hydrolysis, total reducing sugars yield from enzymatic hydrolysis was 72.0 g/100 g raw material, but the overall sugars yield from the combined acid and enzymatic hydrolysis was 62.0g/100 g raw material because of the decomposition of hydrolysate in acid hydrolysis process. Corn stalks (<20 mesh) pretreated by hydrochloric acid could obtain the highest overall sugars yield, 72.0 g/100 g raw material. The results demonstrated that each pretreatment method was an efficient way to improve the enzymatic digestibility of corn stalks, but they need to be optimized for the industrialization.
screw extrusion steam explosion enzymatic hydrolysis pretreatment corn stalks
Qiu-ting HUANG Guo LI Chang CHEN PengZHANG
Life science and Technology College,Beijing University of Chemical Technology,Beijing 100029,China
国际会议
广州
英文
698-702
2008-12-03（万方平台首次上网日期，不代表论文的发表时间）