【摘要】 以贵州慈竹为研究对象,对其进行水热预处理(LHWP),研究不同预处理强度系数对竹材化学组分、酶水解性能及低聚木糖(XOS)浓度的影响。利用X射线衍射(XRD)和傅里叶转换红外线光谱分析仪(FT-IR)分析预处理前后物料的物理和化学结构变化。研究结果表明:水热预处理过程中竹材的半纤维素含量显著降低,而纤维素及木质素的含量则有所增加;水热预处理能够显著提升竹材的酶解效率,在预处理强度系数为4.50时,预处理竹材的酶水解性能最高,葡聚糖和木聚糖酶水解得率分别为79.0%和92.0%;而XOS质量浓度则在强度系数为3.96时,达到最大值8.7 g/L(得率55.3%),继续提高预处理强度,XOS质量浓度降低,在强度系数为4.50时,体系中仅检测到0.5 g/L(得率3.1%)XOS。更多还原

【Abstract】 Effects of liquid hot water pretreatment(LHWP) on the chemical composition, enzymatic digestibility,and xylooligosaccharides(XOS)concentration were investigated in Bambusa emeiensis. In addition, the physical and chemical structural variationsof thesamples before and after the pretreatment were studied using a X-ray diffraction(XRD)spectrometer and Fourier transform infrared spectroscopy(FT-IR). Results indicated that the xylan content was significantly decreased after LHWP, while the contents of glucan and lignin increasing accordingly. LHWP improved the enzymatic digestibility of the bamboo chips feedstock, and the enzymatic hydrolysis yield reached the maximum of 79.0%(glucan) and 92.0%(xylan) at a pretreatment intensity coefficiency of 4.50. However, the XOS concentration reached the maximum value(8.7 g/L)at an intensity coefficiency of 3.96(relative mass percentage of 55.3%), and decreased thereafter as the pretreatment strength was further increased. Finally only 0.5 g/L(relative mass percentage of 3.1%)XOS was obtained in the pretreatment prehydrolysate at an intensity coefficiency of 4.50.Key word:更多还原