Jiangsu Provincial Key Laboratory of Pulp and Paper Science and Technology, Nanjing Forestry University, Nanjing 210037, China.
Bioresour Technol. 2012 Nov;124:283-91. doi: 10.1016/j.biortech.2012.08.041. Epub 2012 Aug 19.
The effects of sodium carbonate (Na(2)CO(3)) pretreatment on the chemical compositions and enzymatic saccharification of rice straw were investigated. The enzymatic digestibility of rice straw is enhanced after pretreatment since pretreated solids show significant delignification with high sugar availability. During pretreatment, an increasing temperature and Na(2)CO(3) charge leads to enhanced delignification, whereas an increased degradation of polysaccharides as well, of which xylan acts more susceptible than glucan. The sugar recovery of enzymatic hydrolysis goes up rapidly with the total titratable alkali (TTA) increasing from 0% to 8%, and then it reaches a plateau. The highest sugar recovery of rice straw after pretreatment, 71.7%, 73.2%, and 76.1% for total sugar, glucan, and xylan, respectively, is obtained at 140°C, TTA 8% and cellulase loading of 20 FPU/g-cellulose. In this condition, the corresponding delignification ratio of pretreated solid is 41.8%, while 95% of glucan and 76% of xylan are conserved.
研究了碳酸钠（Na(2)CO(3)）预处理对稻草化学成分和酶解糖化的影响。预处理后的固体具有较高的糖可用性和明显的脱木质素作用，从而提高了稻草的酶消化率。在预处理过程中，升高温度和碳酸钠用量会促进脱木质素，但也会导致多糖降解，其中木聚糖比纤维素更易降解。随着总可滴定碱（TTA）从 0%增加到 8%，酶水解的糖回收率迅速上升，然后达到一个平台。在 140°C、TTA 8%和纤维素酶用量为 20 FPU/g-纤维素的条件下，预处理后稻草的总糖、葡聚糖和木聚糖的最高糖回收率分别为 71.7%、73.2%和 76.1%。在这种条件下，预处理固体的脱木质素率为 41.8%，而 95%的葡聚糖和 76%的木聚糖得以保留。
