Composition Changes and Enzymatic Hydrolysis Property of Tamarix under Various Factors of Steam Explosion
It’s essential and important to carry out research on the tamarix high-valued biorefining for promoting national land afforestation,ecological construction and agricultural income as tamarix is a kind of abundant lignocellulosic resources in western China.Few reports about tamarix have been found now.In this study,effects of residence time,explosion temperature and severity factor (lg R) on the composition and cellulose enzymatic hydrolysis performance of tamarix were presented during steam explosion pretreatment (SEP).The result showed that SEP hardly changed the contents of cellulose and sulfuric acid insoluble lignin in tamarix; however,it could break effectively the native structure of tamarix and promote most xylan to degrade into xylose by its auto-hydrolysis,in which some small molecule derivates came together,such as acetic acid,formic acid and furfural and so on.In view of the recovery ratio and the enzyme hydrolysis yield of cellulose in tamarix,maximum glucose yields upon enzymatic hydrolysis were obtained after pretreatment at 210℃ for 10 min.Based on the cellulose recovery rate and the cellulose hydrolysis yield,the optimum steam explosion pretreatment conditions for tamarix biorefinery was at the lg R value of 4.239(Steam explosion temperature was 210℃,residence time was 10 min).And in the steam-exploded tamarix the cellulose content changed little,it’s all around 42%,while the residual hemicellulose was only 1.65%,and generated 0.28% formic acid and 2.18% acetic acid.The enzymatic hydrolysis yield of cellulose in the steam exploded tamarix raised to 86% from 15.5% of the native material at lg R = 4.239 with the cellulase loading of 20.0 FPIU/ (g cellulose) after reaction for 48 h.Overall,this study shows that steam explosion without an acid catalysis is a good pretreatment method for saccharification of tamarix.Optimal steam explosion conditions need to be a compromise between sugar accessibility and sugar degradation.
Tamarix steam explosion pretreatment severity factor cellulose enzymatic
Hong Xu Yong Xu Qiang Yong Shiyuan Yu
College of Chemical Engineering,Nanjing Forestry University,Nanjing 21037,China;MEC Key Laboratory o College of Chemical Engineering,Nanjing Forestry University,Nanjing 21037,China;Jiangsu Key Laborato
国内会议
南京
英文
1-8
2012-09-01（万方平台首次上网日期，不代表论文的发表时间）