Department of Chemical Engineering, Auburn University, Auburn, AL 36849, USA.
Biotechnol Prog. 2010 Jul-Aug;26(4):1180-6. doi: 10.1002/btpr.405.
Sodium hydroxide and its derivatives are used as pulping reagents, wherein the spent NaOH is recovered in salt form and reused. In this study, use of low concentration NaOH (1-5%) in pretreatment of corn stover and hybrid poplar was investigated. It was done with the understanding that NaOH can be recovered. One of the main objectives in this study is to explore the potential of H(2)O(2) with NaOH for pretreatment of high lignin substrate such as hybrid poplar. Pretreatment time has not been optimized in this study but held constant at 24 h. Corn stover, after treatment with NaOH under moderate conditions, attains near quantitative glucan digestibility. On the other hand, hybrid poplar requires treatment at higher temperature and NaOH concentration to attain acceptable level of digestibility. Supplementation of hydrogen peroxide in the pretreatment significantly raises delignification and digestibility of hybrid poplar. It was also helpful in retaining the carbohydrates in the treated solids. Retention of hemicellulose after pretreatment provides a significant economic benefit as it eliminates the need for detoxifying hemicellulose sugars. As the residual xylan remaining after pretreatment is an impediment to enzymatic digestion of glucan, supplementation of xylanase has significantly increased the digestibility of glucan as well as xylan of the treated hybrid poplar.
氢氧化钠及其衍生物被用作制浆试剂，其中用过的氢氧化钠以盐的形式回收并重复使用。在这项研究中，研究了在预处理玉米秸秆和杂交杨木中使用低浓度氢氧化钠（1-5%）。这是基于氢氧化钠可以回收的理解。本研究的主要目标之一是探索在预处理高木质素底物（如杂交杨木）时使用 H(2)O(2)与 NaOH 的潜力。本研究未优化预处理时间，但保持在 24 小时不变。在温和条件下用氢氧化钠处理后，玉米秸秆几乎可以达到 100%的葡聚糖消化率。另一方面，杂交杨木需要在更高的温度和氢氧化钠浓度下处理，才能达到可接受的消化率水平。在预处理中添加过氧化氢显著提高了杂交杨木的脱木质素率和消化率。它还有助于保留处理过的固体中的碳水化合物。预处理后半纤维素的保留提供了显著的经济效益，因为它消除了对半纤维素糖进行解毒的需要。由于预处理后剩余的木聚糖是阻碍葡聚糖酶解的障碍，因此添加木聚糖酶显著提高了处理过的杂交杨木的葡聚糖和木聚糖的消化率。
