Activation of Enzymatic Hydrolysis Lignin by NaOH/Urea Aqueous Solution for Enhancing Its Sulfomethylation Reactivity,ACS Sustainable Chemistry & Engineering

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Activation of Enzymatic Hydrolysis Lignin by NaOH/Urea Aqueous Solution for Enhancing Its Sulfomethylation Reactivity
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2018-11-30 00:00:00 , DOI: 10.1021/acssuschemeng.8b04781
Binpeng Zhang ₁ , Dongjie Yang _{1,

2} , Huan Wang ₁ , Yong Qian ₁ , JinHao Huang ₁ , Lixuan Yu ₁ , Xueqing Qiu _{1,

2}

Affiliation

Enzymatic hydrolysis lignin (EHL), from straw bioethanol process, was activated using NaOH/urea aqueous solution under low temperature condition to enhance its sulfonation degree and dispersion property. The sulfonation degree of EHL increased by 62.60% after the activation of NaOH/urea aqueous solution at −10 °C for 12 h, which is resulted from the breakage of the hydrogen bonds and ether bonds in lignin–carbohydrate complexes (LCCs) and the removal of residual carbohydrate. The functional group content, 2D-HSQC, and AFM analysis indicated that the increase of phenolic groups and the weakened aggregation degree of EHL after the activation are in favor of the increase of activity sites and decrease of steric hindrance, which is beneficial to the enhancement of sulfomethylation reactivity. Owing to the enhancement of reactivity, the dispersion properties of sulfomethylated EHL on graphite suspension were significantly enhanced.

中文翻译：

NaOH /尿素水溶液活化酶解木质素的磺甲基化反应活性

在低温条件下，使用NaOH /尿素水溶液将秸秆生物乙醇工艺中的酶促水解木质素（EHL）活化，以提高其磺化度和分散性。在-10°C的NaOH /脲水溶液中活化12h后，EHL的磺化度提高了62.60％，这是由于木质素-碳水化合物配合物（LCCs）和木质素-碳水化合物络合物中氢键和醚键的断裂所致。去除残留的碳水化合物。官能团含量，2D-HSQC和AFM分析表明，活化后酚基的增加和EHL聚集度的降低有利于活性位点的增加和位阻的减少，有利于增强磺甲基化反应性。由于反应性的提高，

更新日期：2018-11-30

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