Department of Chemical Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran.
Department of Chemical Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran; Department of Chemical Engineering, Vrije Universiteit Brussel, 1050 Brussels, Belgium.
Bioresour Technol. 2021 Jan;319:124167. doi: 10.1016/j.biortech.2020.124167. Epub 2020 Sep 24.
Extractives are nonstructural constituents of lignocellulosic materials available in small portions; however, their influence on the bioconversion processes cannot be disregarded. This study evaluated the effect of various concentrations of rice straw water extractives (RWE) and ethanol extractives (REE) on enzymatic hydrolysis, anaerobic digestion, and simultaneous saccharification and fermentation productivity. By increasing the RWE or REE concentration, the glucose yield did not change after 72 h of enzymatic hydrolysis. The RWE increment enhanced ethanol yield to 95.6%. However, the REE increment decreased ethanol yield to 32.1%. Adding RWE caused a considerable reduction in the accumulated biogas and changed the composition of produced biogas from 74% methane to less than 1%. By increasing the REE concentration, the accumulated biogas increased from 167.9 to 524.4 ml/g VS. According to the gas chromatography-mass spectrometry (GC/MS) results, the most abundant RWE and REE components were 3-hydroxy-Spirost-8-en-11-one and guaiazulene, respectively.
抽提物是木质纤维素材料中含量较少的非结构性成分；然而，它们对生物转化过程的影响不容忽视。本研究评估了不同浓度的稻草水抽提物（RWE）和乙醇抽提物（REE）对酶水解、厌氧消化以及同步糖化和发酵生产力的影响。随着 RWE 或 REE 浓度的增加，72 小时的酶水解后葡萄糖产量没有变化。RWE 的增加将乙醇产量提高到 95.6%。然而，REE 的增加将乙醇产量降低至 32.1%。添加 RWE 会导致沼气的大量减少，并使产生的沼气的组成从 74%甲烷变为不到 1%。随着 REE 浓度的增加，累积沼气从 167.9 增加到 524.4ml/gVS。根据气相色谱-质谱（GC/MS）结果，RWE 和 REE 中最丰富的成分分别是 3-羟基-Spirost-8-烯-11-酮和愈创木薁。
