摘要
采用硫酸水解法(aldito-acetate procedure)、X射线粉末衍射(XRD)、傅里叶变换红外光谱(FTIR)分析了蒸爆过程中毛竹材加工剩余物纤维聚集态结构及主要化学成分的变化。研究结果表明,(1)毛竹材加工剩余物经蒸爆处理,60%左右的半纤维素水解,木质素低分子化且裸露到纤维表面,易被80%乙醇及木质素溶剂提取,从而实现毛竹材加工剩余物主要组分的有效分离。(2)毛竹材加工剩余物经蒸爆处理,80%乙醇抽提物得率提高,综纤维素得率减少,木质素含量减少;葡萄糖相对含量增加,半纤维素降解明显。(3)210℃处理10 min和220℃处理10 min的蒸爆浆的化学组成变化几乎没有区别,但两者与200℃处理10 min差别较大,210℃处理10 min是毛竹材加工剩余物适宜的处理温度。(4)FTIR结果显示蒸爆处理后在1 040～1 060 cm-1区的吸收峰分裂为明显的2个峰表明半纤维素降解,1 166 cm-1处的吸收强度明显减弱,表明C-O-C键有不同程度的断裂。X-射线衍射分析结果显示毛竹材加工剩余物蒸爆处理后纤维素相对结晶度增加。
Chemical changes in cell wall components of bamboo residue during steam explosion were analyzed by methods of aldito-acetate procedure,X-ray diffraction（XRD） and Fourier transform infrared spectroscopy（FTIR）.Lignin linkages were cleaved and formed low molecular substances during steam explosion,thus,lignin were liberated from the cell wall to the fiber surface,and almost 60% hemicelluloses was lost after steam explosion treatment.After steam explosion treatment,yields of 80% ethanol extractives and glucose contents were increased while lignin contents and hemicelluloses were decreased.It was found that 210℃ was the best steam explosion condition for bamboo residue.FTIR and X-ray results also suggested hemicelluloses were decreased after steam explosion treatment.
出处
《竹子研究汇刊》
北大核心
2011年第4期35-39,共5页
Journal of Bamboo Research
基金
国家林业局948项目(2011-4-09)
