Effect of xylan and lignin removal by batch and flowthrough pretreatment on the enzymatic digestibility of corn stover cellulose
Effect of xylan and lignin removal by batch and flowthrough pretreatment on the enzymatic digestibility of corn stover cellulose
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DOI：
10.1002/bit.20043
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发表时间：
2004-04-05
影响因子：
3.8
通讯作者：
Wyman, CE
中科院分区：
文献类型：
--
作者：
Yang, B;Wyman, CE
与分批系统相比，流通和逆流反应器具有重要的潜在优势，用于预处理纤维素生物质，包括更高的半纤维素糖产率，增强的纤维素消化率，和减少的化学添加。不幸的是，他们遭受高水和能源使用。为了更好地理解这些权衡，报道了在160 ° C和220 ° C之间的流速范围内，仅用水和0.1重量%硫酸，在分批和流通反应器中预处理的玉米秸秆的木聚糖和木质素去除以及纤维素的酶消化率的比较数据。仅用水增加流量提高了木聚糖的溶解速率，使总木质素去除率增加了一倍以上，并增加了纤维素的消化率。此外，加入稀硫酸增加了木聚糖去除率的分批和流通系统。有趣的是，加入酸也增加了木质素的去除速率，但当分批加入酸时，较少的木质素留在溶液中。虽然预处理纤维素的酶水解与木聚糖去除有关，但如其他人所示，对于相同程度的木聚糖去除，与分批系统相比，流通的消化率要好得多。纤维素的消化流通反应器有关的木质素去除以及。这些结果表明，改变木质素也影响玉米秸秆的酶消化率。(C)2004 Wiley Periodicals，Inc.
Compared with batch systems, flowthrough and countercurrent reactors have important potential advantages for pretreating cellulosic biomass, including higher hemicellulose sugar yields, enhanced cellulose digestibility, and reduced chemical additions. Unfortunately, they suffer from high water and energy use. To better understand these trade-offs, comparative data are reported on xylan and lignin removal and enzymatic digestibility of cellulose for corn stover pretreated in batch and flowthrough reactors over a range of flow rates between 160degrees and 220degreesC, with water only and also with 0.1 wt% sulfuric acid. Increasing flow with just water enhanced the xylan dissolution rate, more than doubled total lignin removal, and increased cellulose digestibility. Furthermore, adding dilute sulfuric acid increased the rate of xylan removal for both batch and flowthrough systems. Interestingly, adding acid also increased the lignin removal rate with flow, but less lignin was left in solution when acid was added in batch. Although the enzymatic hydrolysis of pretreated cellulose was related to xylan removal, as others have shown, the digestibility was much better for flowthrough compared with batch systems, for the same degree of xylan removal. Cellulose digestibility for flowthrough reactors was related to lignin removal as well. These results suggest that altering lignin also affects the enzymatic digestibility of corn stover. (C) 2004 Wiley Periodicals, Inc.