Sun R C, Sun X F, Ma X H
State Key Laboratory of Pulp and Paper Engineering, College of Paper and Environment Engineering, South China University of Technology, Guangzhou 510640, People's Republic of China.
Ultrason Sonochem. 2002 Mar;9(2):95-101. doi: 10.1016/s1350-4177(01)00102-x.
Effect of ultrasound on the yield and physiochemical properties of hemicelluloses from wheat straw using 0.5 M NaOH in 60% aqueous methanol has been comparatively studied. The results showed that applying sonication for 5, 10, 15, 20, 25, 30, and 35 min resulted in an increasing yield of hemicelluloses by 2.9%, 3.9%, 6.0%, 8.6%, 8.6%, 8.6%, and 9.2% of the original hemicelluloses, respectively, in comparison with the experiment performed without ultrasonic assistance. The hemicelluloses isolated by ultrasound-assisted extraction, showed a slightly lower molecular weight, associated lignin, and thermal stability during the first stage of decomposition, but slightly more linear as compared to the hemicelluloses obtained by classical method without ultrasonic irradiation. No substantial differences in the main structure features between the hemicellulosic preparations isolated by classical or ultrasound-assisted extractions were found.
比较研究了超声对使用0.5 M氢氧化钠在60%甲醇水溶液中从麦草中提取半纤维素的得率和理化性质的影响。结果表明，与未进行超声辅助的实验相比，超声处理5、10、15、20、25、30和35分钟分别使半纤维素得率比原始半纤维素增加了2.9%、3.9%、6.0%、8.6%、8.6%、8.6%和9.2%。通过超声辅助提取分离得到的半纤维素在分解第一阶段显示出略低的分子量、结合木质素和热稳定性，但与通过无超声辐射的经典方法获得的半纤维素相比，其线性略高。通过经典提取或超声辅助提取分离得到的半纤维素制剂在主要结构特征上没有发现实质性差异。
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