A STRATEGY TO IMPROVE ENZYMATIC SACCHARIFICATION OF WHEAT STRAW BY ADDING WATER-SOLUBLE LIGNIN PREPARED FROM SODA PRETREATMENT SPENT LIQUOR
Wheat straw was pretreated by sodium hydroxide at different alkali charge.The spent liquor was collected to isolate lignin at pH 2 by adding mineral acid.The precipitated lignin was then classified into two fractions(pH 2–5 and > 5,expressed as AL1 and AL2)through pH adjustment.The fraction AL2 was sulfomethylated to obtain the water-soluble lignin preparation SAL2.Two prepared water-soluble lignin samples,i.e.AL1 and SAL2,was used as additives for enhancing the enzymatic sugar conversion of soda-pretreated wheat straw.Both AL1 and SL2 could improve the substrate enzymatic digestibility(SED)at a certain dosage.However,the addition of AL1 and ASL2 decreased the SED of bleached wheat straw.The results indicate that the effect of water-soluble lignin on SED is substrate lignin dependent.This finding makes it possible to build an economical internal circulation system of reusing the dissolved lignin in spent liquor for enhancing enzymatic sugar conversion.
Xufeng Luo Jiyao Yu Yangsu Zhu Yongcan Jin
Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources,Nanjing Forestry University,Nanjing 210037,China
国际会议
第五届制浆造纸新技术国际研讨会(ISETPP)暨第三届国际造纸与环境学术大会(IPEC)
广州
英文
1-4
2016-11-07（万方平台首次上网日期，不代表论文的发表时间）