Voiland School of Chemical Engineering and Bioengineering, Bioproducts, Science and Engineering Laboratory, Washington State University, Richland, WA 99354, United States.
Bioresour Technol. 2013 Dec;150:321-7. doi: 10.1016/j.biortech.2013.10.020. Epub 2013 Oct 12.
This study investigated softwood hemicelluloses degradation pathways during alkaline hydrogen peroxide (AHP) pretreatment of Douglas fir. It was found that glucomannan is much more susceptible to alkaline pretreatment than xylan. Organic acids, including lactic, succinic, glycolic and formic acid are the predominant products from glucomannan degradation. At low treatment temperature (90°C), a small amount of formic acid is produced from glucomannan, whereas glucomannan degradation to lactic acid and succinic acid becomes the main reactions at 140°C and 180°C. The addition of H2O2 during alkaline pretreatment of D. fir led to a significant removal of lignin, which subsequently facilitated glucomannan solubilization. However, H2O2 has little direct effect on the glucomannan degradation reaction. The main degradation pathways involved in glucomannan conversion to organics acids are elucidated. The results from this study demonstrate the potential to optimize pretreatment conditions to maximize the value of biomass hemicellulose.
本研究调查了在花旗松的碱性过氧化氢（AHP）预处理过程中软木半纤维素的降解途径。研究发现，葡甘露聚糖比木聚糖更容易受到碱性预处理的影响。有机酸，包括乳酸、琥珀酸、乙醇酸和甲酸，是葡甘露聚糖降解的主要产物。在较低的处理温度（90°C）下，从葡甘露聚糖中产生少量的甲酸，而在 140°C 和 180°C 时，葡甘露聚糖降解为乳酸和琥珀酸成为主要反应。在花旗松的碱性预处理中添加 H2O2 会导致木质素的大量去除，从而促进了葡甘露聚糖的溶解。然而，H2O2 对葡甘露聚糖的降解反应几乎没有直接影响。阐明了将葡甘露聚糖转化为有机酸的主要降解途径。本研究的结果表明，有可能优化预处理条件以最大限度地提高生物质半纤维素的价值。
