Department of Chemical and Environmental Engineering, Faculty of Engineering, Universiti Putra Malaysia, 43400 UPM Serdang, Malaysia.
Bioresour Technol. 2010 Dec;101(24):9792-6. doi: 10.1016/j.biortech.2010.07.074. Epub 2010 Jul 22.
Various pre-treatment techniques change the physical and chemical structure of the lignocellulosic biomass and improve hydrolysis rates. The effect of ultrasonic pre-treatment on oil palm empty fruit bunch (OPEFB) fibre prior to acid hydrolysis has been evaluated. The main objective of this study was to determine if ultrasonic pre-treatment could function as a pre-treatment method for the acid hydrolysis of OPEFB fibre at a low temperature and pressure. Hydrolysis at a low temperature was studied using 2% sulphuric acid; 1:25 solid liquid ratio and 100 degrees C operating temperature. A maximum xylose yield of 58% was achieved when the OPEFB fibre was ultrasonicated at 90% amplitude for 45min. In the absence of ultrasonic pre-treatment only 22% of xylose was obtained. However, no substantial increase of xylose formation was observed for acid hydrolysis at higher temperatures of 120 and 140 degrees C on ultrasonicated OPEFB fibre. The samples were then analysed using a scanning electron microscope (SEM) to describe the morphological changes of the OPEFB fibre. The SEM observations show interesting morphological changes within the OPEFB fibre for different acid hydrolysis conditions.
各种预处理技术改变了木质纤维素生物质的物理和化学结构，提高了水解速率。本研究评价了超声预处理对油棕空果串（OPEFB）纤维在酸水解前的作用。本研究的主要目的是确定超声预处理是否可以作为在低温和低压下对 OPEFB 纤维进行酸水解的预处理方法。在低温下使用 2%硫酸、固液比为 1:25 和 100°C 操作温度进行水解。当 OPEFB 纤维在 90%振幅下超声处理 45 分钟时，木糖的最大得率为 58%。在没有超声预处理的情况下，仅获得 22%的木糖。然而，对于在超声处理的 OPEFB 纤维上更高的 120 和 140°C 温度下的酸水解，没有观察到木糖形成的实质性增加。然后使用扫描电子显微镜（SEM）对样品进行分析，以描述 OPEFB 纤维的形态变化。SEM 观察显示，不同的酸水解条件下，OPEFB 纤维内发生了有趣的形态变化。
