University of California, Center for Environmental Research and Technology, Bourns College of Engineering, 1084 Columbia Avenue, Riverside, CA 92507, USA.
Bioresour Technol. 2011 May;102(10):5952-61. doi: 10.1016/j.biortech.2011.03.027. Epub 2011 Mar 14.
Heating of batch tubular reactors with fluidized sand baths and with microwaves resulted in distinctive sugar yield profiles from pretreatment and subsequent enzymatic hydrolysis of corn stover at the same time, temperature, and dilute sulfuric acid concentration combinations and hydrothermal pretreatment conditions. Microwave heated pretreatment led to faster xylan, lignin, and acetyl removal as well as earlier xylan degradation than sand baths, but maximum sugar recoveries were similar. Solid state CP/MAS NMR revealed that microwave heating was more effective in altering cellulose structural features especially in breakdown of amorphous regions of corn stover than sand bath heating. Enzymatic hydrolysis of pretreated corn stover was improved by microwave heating compared to sand bath heating. Mechanisms were proposed to explain the differences in results for the two systems and provide new insights into pretreatment that can help advance this technology.
采用流化砂浴和微波加热分批管式反应器，对玉米秸秆进行预处理和后续酶解，在相同的温度、稀硫酸浓度组合和水热预处理条件下，得到了不同的糖产率分布。与砂浴相比，微波加热预处理可更快地去除木聚糖、木质素和乙酰基，更早地进行木聚糖降解，但最大糖回收率相似。固态 CP/MAS NMR 表明，与砂浴加热相比，微波加热更有效地改变了纤维素的结构特征，特别是破坏了玉米秸秆无定形区域。与砂浴加热相比，微波加热可提高预处理玉米秸秆的酶解效率。提出了一些机制来解释两种系统结果的差异，并为预处理提供了新的见解，有助于推进该技术。
