纤维素
木质素
竹子
氢氧化钠
水解
硫酸
化学
纤维素酶
结晶度
木聚糖酶
半纤维素
核化学
聚合度
木聚糖
纤维素纤维
酶水解
聚合
材料科学
有机化学
聚合物
复合材料
酶
结晶学
作者
Xuemin Qi,Jianzhou Chu,Liangliang Jia,Anuj Kumar
出处
期刊:Materials
[MDPI AG]
日期:2019-08-12
卷期号:12 (16): 2570-2570
被引量:12
摘要
In the present study, three pretreatments of sodium hydroxide (NaOH), sulfuric acid (H2SO4), and glycerin were employed with bamboo fibers at two different temperatures of 117 °C and 135 °C, respectively. The chemical composition and structural characterization of the pretreated bamboo fibers were comparatively studied using spectroscopic and wet chemistry methods. Furthermore, the comparative hydrolysis behaviors of pretreated bamboo were studied due to the synergistic interaction between cellulases and xylanase. The NaOH treatment increased the holocellulose contents to 87.4%, and the mean diameter of the cellulose fibers decreased from 50 ± 5 µm (raw fiber bundles) to 5 ± 2 µm. The lignin content and the degree of cellulose polymerization both decreased, while the crystallinity index of cellulose and thermostability increased. The hydrolysis yields of NaOH pretreated bamboo at 135 °C increased from 84.2% to 98.1% after a supplement of 0.5 cellulose to 1 mg protein/g dry xylan. The NaOH pretreatment achieved optimal enzymatic digestibility, particularly at higher temperatures as indicated by the results.
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