超临界二氧化碳及超声预处理促进玉米芯水解制备还原糖研究  

Preparation of Reducing Sugars via Accelerated Hydrolysis of Corncob by Supercritical Carbon-dioxide and Ultrasonic Pretreatment

作　　者：罗鹏[1] 王恩俊[1] 徐琴琴[1] 银建中[1] 

机构地区：[1]大连理工大学化工机械学院,辽宁大连116023

出　　处：《生物质化学工程》2012年第5期29-32,共4页Biomass Chemical Engineering

摘　　要：以玉米芯为原料,使用超临界二氧化碳及超声预处理后,再用稀酸水解制备还原糖。重点考察了预处理温度、原料含水量以及超声作用时间对还原糖产率的影响。结果表明,超临界二氧化碳预处理最佳条件为:100℃,原料含水量50%、30 min、15 MPa;超声预处理最佳条件为:59 kHz、90 W、20 min;采用质量分数为1%稀硫酸溶液对预处理样品进行水解,水解温度160℃、时间40 min、液固比50∶1,以评价预处理的效果,两种预处理条件下对应的最大还原糖产率分别为39.5%和38.4%,相比空白样品分别提高13.3和12.2个百分点。Reducing sugars can be derived from biomass hydrolysis. The corncob hydrolysis was conducted after supercritical carbon dioxide pretreatment and ultrasonic pretreatment. The effects of pretreatment temperature, moisture content, temperature and time of ultrasonic on the yield of the reducing sugars were emphasized. The result shows showed that the optimum conditions of corncob supercritical carbon dioxide pretreatment were 100~C, 50 % moisture content, 30 min and 15 MPa. The optimum conditions of corncob ultrasonic pretreatment were 59 kHz,90 W and 20 min. The pretreated corncob was hydrolysised with 1% dilute sulphuric acid under the condition of 160℃, 40 min and liquid to solid ratio of 50： 1. The highest yield of reducing sugars is 39.5 % and 38.4 % , respectively. Compared with the control sample, the yield of the reducing sugars was increased by 13.3 and 12.2 percent point, respectively.

关 键 词：玉米芯 超临界二氧化碳预处理 超声预处理 水解 还原糖 

分 类 号：TQ352.6[化学工程]