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白酒丢糟酸水解制备木糖及其结构变化
引用本文:刘高梅,任海伟.白酒丢糟酸水解制备木糖及其结构变化[J].食品与发酵工业,2013,39(3):106-110.
作者姓名:刘高梅  任海伟
作者单位:1. 山西轻工职业技术学院轻工化工工程系,山西太原,030013
2. 兰州理工大学生命科学与工程学院,甘肃兰州,730050
基金项目:甘肃省自然科学基金项目,兰州理工大学红柳青年教师培养计划
摘    要:采用混合酸水解法提取白酒丢糟中的木糖,并研究木糖提取过程中丢糟的结构变化。以木糖收率为指标,考查酸解温度、固液比、混合酸浓度和酸解时间4个因素对木糖提取效果的影响,利用正交试验优化工艺参数。结果表明,从丢糟中提取木糖的最优条件为温度110℃、固液比1∶12(g∶mL)、混合酸浓度1.5%和时间145min,该条件下的木糖收率为61.24%。经酸水解法提取木糖后,丢糟的木质纤维结构变化明显,孔隙率和比表面积增加,形貌结构改变,半纤维素和纤维素无定形区被降解,导致结晶度增加。

关 键 词:白酒丢糟  酸水解  木糖  扫描电镜  X-衍射

Production of xylose from distiller's grains (DG) by acid hydrolysis and the structural change of DG
Liu Gao-mei,Ren Hai-wei.Production of xylose from distiller's grains (DG) by acid hydrolysis and the structural change of DG[J].Food and Fermentation Industries,2013,39(3):106-110.
Authors:Liu Gao-mei  Ren Hai-wei
Affiliation:1(Shanxi Light Industry Technical College,Taiyuan 030013,China) 2(College of Life Science and Engineering,Lanzhou University of Technology,Lanzhou 730050,China)
Abstract:The method of mixed acid hydrolysis was used to produce xylose from distiller's grains(DG),and the structural changes of DG during the production of xylose were investigated with X-ray diffraction(XRD) and scanning electronic microscopy(SEM).In order to improve the yield of xylose,the key parameters including temperature,mixed acid concentration,solid-liquid ratio and acid hydrolysis time were investigated by means of orthogonal test.The optimal levels for the highest yield of xylose were obtained under the conditions of temperature of 110℃,solid-liquid ratio of 1∶ 12(g∶ mL),mixed acid concentration of 1.5%,time of 145 min.The yield of xylose reached 61.24% under optimized conditions.Studies on the structure of DG during the production of xylose showed that the lignocellulosic structural changes undergone by acid hydrolysis were obvious.The disruption of lignocellulosic structure resulted in the increasing surface exposure and porosity of acid hydrolysis residues.The crystallinity of acid hydrolysis residues was increased by comparison of DG,as a result of the degradation of hemicellulose and the amorphous region of cellulose.
Keywords:distiller's grains(DG)  acid hydrolysis  xylose  scanning electronic microscopy(SEM)  X-ray diffraction(XRD)
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