碱性预处理对酸水解后玉米芯残渣酶解性能及木素结构变化的影响  

The Effect of Alkaline Pretreatment on Enzymatic Hydrolysis of Corncob Residue and Structural Change of Lignin

作　　者：杨海涛[1] 涂洪峰 姚兰[1] 谢益民[1] 

机构地区：[1]湖北工业大学制浆造纸工程学院,湖北武汉430068

出　　处：《造纸科学与技术》2015年第3期66-68,99,共4页Paper Science & Technology

基　　金：山东大学微生物技术国家重点实验室开放基金(M2012-07)

摘　　要：玉米芯经稀酸水解后的残渣(以下简称残渣)富含有纤维素,可以作为生产生物乙醇的优良原料。我国是玉米种植大国,并且玉米播种面积持续上升,而大量的残渣都是经过焚烧来处理的,这样既浪费资源,又污染环境。本文主要研究以残渣作为原料,碱性预处理前后酶解糖化中纤维素酶的可及度和酶解率的变化情况。通过成分分析发现在碱处理过程中,有部分半纤维素、灰分、抽出物和木素溶解在预处理液中,尤其是木素,脱除率高达40.48%。用贝克曼法提取处理前后残渣中磨木木素(MWL),通过红外谱图对其进行分析,结果表明残渣中提取的木素是GSH型,在碱性预处理过程中,GSH降解程度大小关系为G>S>H。经过GPC测分子量可以得出,木素部分溶于预处理液中,使得质均分子量降低,分散度降低。Corncob residue, which contains a lot of cellulose, is acid - extraction residue from corncob. A large ar- ea of corn is planted in China every year. And the area is rising gradually. However, a large amount of corn cob residue is burnt. It is not only a waste of resources, but also pollutes the environment. In this paper, corncob resi- due was used as raw material. The effect of alkaline pretreatment on cellulose conversion during enzymatic hydroly- sis and structural change of lignin were studied. According to component analysis, part of hemicellulose, ash, ex- tractive and lignin were dissolved in the pretreatment solution. 40.48% of lignin was removed. Through analysis of MWL, it was found that the extracted MWL was GSH type. During the pretreatment process, the degree of degrada- tion of GSH substructures were G 〉 S 〉 H. By means of using GPC to analyze the molecular weight, it could be concluded that part of lignin dissoslves in the pretreatment solution, making the average mass molecular weight and dispersion decrease.

关 键 词：碱性预处理 玉米芯残渣 MWL 酶解 

分 类 号：TQ352.1[化学工程]