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Fates of hemicellulose, lignin and cellulose in concentrated phosphoric acid with hydrogen peroxide (PHP) pretreatment†
RSC Advances ( IF 3.9 ) Pub Date : 2018-04-03 00:00:00 , DOI: 10.1039/c8ra00764k Qing Wang 1, 2 , Dong Tian 1, 2 , Jinguang Hu 3, 4 , Fei Shen 1, 2 , Gang Yang 1, 2 , Yanzong Zhang 2 , Shihuai Deng 1, 2 , Jing Zhang 1, 2 , Yongmei Zeng 1, 2 , Yaodong Hu 1, 2
RSC Advances ( IF 3.9 ) Pub Date : 2018-04-03 00:00:00 , DOI: 10.1039/c8ra00764k Qing Wang 1, 2 , Dong Tian 1, 2 , Jinguang Hu 3, 4 , Fei Shen 1, 2 , Gang Yang 1, 2 , Yanzong Zhang 2 , Shihuai Deng 1, 2 , Jing Zhang 1, 2 , Yongmei Zeng 1, 2 , Yaodong Hu 1, 2
Affiliation
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Xylan, de-alkaline lignin and microcrystalline cellulose were employed as representative models of hemicellulose, lignin and cellulose in lignocellulosic biomass. These three model compounds, together with the real-world biomass, wheat straw were pretreated using the newly developed PHP pretreatment (concentrated phosphoric acid plus hydrogen peroxide) to better understand the structural changes of the recovered solid and chemical fractions in the liquid. Results showed that almost all xylan and higher than 70% lignin were removed from wheat straw, and more than 90% cellulose was recovered in the solid fraction. The pretreated model xylan recovered via ethanol-precipitation still maintained its original structural features. The degree of polymerization of soluble xylooligosaccharides in liquid was reduced, resulting in the increase of monomeric xylose release. Further xylose oxidization via the path of 2-furancarboxylic acid → 2(5H)-furanone → acrylic acid → formic acid was mainly responsible for xylan degradation. The chemical structure of de-alkaline lignin was altered significantly by PHP pretreatment. Basic guaiacyl units of lignin were depolymerized, and aromatic rings and side aliphatic chains were partially decomposed. Ring-opening reactions of the aromatics and cleavage of C–O–C linkages were two crucial paths to lignin oxidative degradation. In contrast to lignin, no apparent changes occurred on microcrystalline cellulose. The reason was likely that acid-depolymerization and oxidative degradation of cellulose were greatly prevented by the formed cellulose phosphate.
中文翻译：
用过氧化氢 (PHP) 预处理的浓磷酸中半纤维素、木质素和纤维素的命运†
木聚糖、脱碱木质素和微晶纤维素被用作木质纤维素生物质中半纤维素、木质素和纤维素的代表模型。使用新开发的 PHP 预处理（浓磷酸加过氧化氢）对这三种模型化合物以及现实世界的生物质、麦秸进行预处理，以更好地了解液体中回收的固体和化学部分的结构变化。结果表明，小麦秸秆中几乎所有的木聚糖和70%以上的木质素都被去除，固体部分中纤维素的回收率超过90%。经预处理的模型木聚糖通过乙醇沉淀仍保持其原有的结构特征。可溶性低聚木糖在液体中的聚合度降低，导致单体木糖释放增加。通过2-呋喃羧酸 → 2(5 H )途径进一步氧化木糖)-呋喃酮→丙烯酸→甲酸主要负责木聚糖降解。PHP预处理显着改变了脱碱木质素的化学结构。木质素的基本愈创木酰基单元被解聚，芳香环和侧脂肪链被部分分解。芳烃的开环反应和 C-O-C 键的断裂是木质素氧化降解的两条关键途径。与木质素相比，微晶纤维素没有发生明显变化。其原因可能是形成的磷酸纤维素极大地阻止了纤维素的酸解聚和氧化降解。
更新日期：2018-04-03
中文翻译：
用过氧化氢 (PHP) 预处理的浓磷酸中半纤维素、木质素和纤维素的命运†
木聚糖、脱碱木质素和微晶纤维素被用作木质纤维素生物质中半纤维素、木质素和纤维素的代表模型。使用新开发的 PHP 预处理（浓磷酸加过氧化氢）对这三种模型化合物以及现实世界的生物质、麦秸进行预处理，以更好地了解液体中回收的固体和化学部分的结构变化。结果表明，小麦秸秆中几乎所有的木聚糖和70%以上的木质素都被去除，固体部分中纤维素的回收率超过90%。经预处理的模型木聚糖通过乙醇沉淀仍保持其原有的结构特征。可溶性低聚木糖在液体中的聚合度降低，导致单体木糖释放增加。通过2-呋喃羧酸 → 2(5 H )途径进一步氧化木糖)-呋喃酮→丙烯酸→甲酸主要负责木聚糖降解。PHP预处理显着改变了脱碱木质素的化学结构。木质素的基本愈创木酰基单元被解聚，芳香环和侧脂肪链被部分分解。芳烃的开环反应和 C-O-C 键的断裂是木质素氧化降解的两条关键途径。与木质素相比，微晶纤维素没有发生明显变化。其原因可能是形成的磷酸纤维素极大地阻止了纤维素的酸解聚和氧化降解。
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