Co-production of sugars and lignin from short rotation white poplar and black locust crops is evaluated. Acid-catalyzed ethanol/water organosolv and dilute acid pretreatments are analyzed. Resulting pretreated materials are hydrolyzed enzymatically for sugar production, whereas solubilized lignins from pretreatment liquors are precipitated, analyzed by analytical standard, and characterized by FTIR spectroscopy, SEC chromatography, and solid-state 13C NMR. Organosolv produces in both materials a high delignification degree (46–50%) and a considerable hemicelluloses removal (62–67%), while acid hydrolysis is more efficient at removing hemicelluloses (86–90%), showing a delignification of 43% (white poplar) and 31% (black locust). Organosolv followed by enzymatic hydrolysis results in 37.8% (white poplar) and 38.2% (black locust) total sugars yields, whereas acid pretreatment and subsequent saccharification show higher sugars yields for white poplar (43.3%) and lower for black locust (29.1%). Regarding lignin samples, higher concentrations are recovered from organosolv liquors of both materials (67.8% and 44.9% yields for white poplar and black locust, respectively) compared to the quantities extracted from acid liquors of white poplar (4.6%) and black locust (6.8%). Organosolv lignins display a lower content of S units and phenols, and higher molecular weights. Contrary, acid lignins consist mainly of phenolic fragments with a higher content of S units and lower molecular weights.

中文翻译：

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从短轮作白杨和刺槐作物中联合生产可溶性糖和木质素

评估了短轮作白杨树和刺槐作物的糖和木质素的联合生产。分析了酸催化的乙醇/水有机溶剂和稀酸预处理。得到的预处理材料通过酶促水解用于糖生产，而来自预处理液的溶解木质素沉淀，通过分析标准进行分析，并通过 FTIR 光谱、SEC 色谱和固态 13C NMR 进行表征。有机溶剂在两种材料中都产生高脱木素度 (46-50%) 和可观的半纤维素去除率 (62-67%)，而酸水解在去除半纤维素方面更有效 (86-90%)，表现出 43% 的脱木素率 (白杨树）和 31%（黑蝗虫）。有机溶剂和酶促水解产生 37.8%（白杨）和 38.2%（黑刺槐）总糖产量，而酸预处理和随后的糖化显示白杨的糖产量更高 (43.3%)，而黑刺槐的糖产量更低 (29.1%)。关于木质素样品，与从白杨 (4.6%) 和刺槐 (6.8) 的酸液中提取的数量相比，从两种材料的有机溶剂液中回收的浓度更高（白杨和刺槐的产率分别为 67.8% 和 44.9%） %）。有机溶剂木质素显示出较低的 S 单元和酚含量，以及较高的分子量。相反，酸性木质素主要由具有较高 S 单元含量和较低分子量的酚类片段组成。与从白杨 (4.6%) 和刺槐 (6.8%) 的酸液中提取的数量相比，从这两种材料的有机溶剂中回收的浓度更高（白杨和刺槐的产率分别为 67.8% 和 44.9%）。有机溶剂木质素显示出较低的 S 单元和酚含量，以及较高的分子量。相反，酸性木质素主要由具有较高 S 单元含量和较低分子量的酚类片段组成。与从白杨 (4.6%) 和刺槐 (6.8%) 的酸液中提取的数量相比，从这两种材料的有机溶剂中回收的浓度更高（白杨和刺槐的产率分别为 67.8% 和 44.9%）。有机溶剂木质素显示出较低的 S 单元和酚含量，以及较高的分子量。相反，酸性木质素主要由具有较高 S 单元含量和较低分子量的酚类片段组成。