文献类型：期刊文献

英文题名：Depolymerization and Demethylation of Kraft Lignin in Molten Salt Hydrate and Applications as an Antioxidant and Metal Ion Scavenger

作者：Yang, Xiaohui[1,2,3,4,5,6] Li, Zheng[5] Li, Long[1,2,3,4] Li, Ning[5] Jing, Fei[1,2,3,4] Hu, Lihong[1,2,3,4,6] Shang, Qianqian[1,2,3,4] Zhang, Xiao[7] Zhou, Yonghong[1,2,3,4] Pan, Xuejun[5]

第一作者：杨晓慧;Yang, Xiaohui

通信作者：Zhou, YH[1];Zhou, YH[2];Zhou, YH[3];Zhou, YH[4];Pan, XJ[5]

机构：[1]Chinese Acad Forestry, Jiangsu Prov Key Lab Biomass Energy & Mat, Nanjing 210042, Peoples R China;[2]Chinese Acad Forestry, Jiangsu Prov Coinnovat Ctr Efficient Proc & Utili, Nanjing 210042, Peoples R China;[3]Chinese Acad Forestry, Key Lab Chem Engn Forest Prod Natl Forestry & Gra, Nanjing 210042, Peoples R China;[4]Chinese Acad Forestry, Natl Engn Lab Biomass Chem Utilizat, Inst Chem Ind Forestry Prod, Nanjing 210042, Peoples R China;[5]Univ Wisconsin, Dept Biol Syst Engn, Madison, WI 53706 USA;[6]Chinese Acad Forestry, Res Inst Forestry New Technol, Beijing 100091, Peoples R China;[7]Washington State Univ, Ctr Bioprod & B Oenergy, 2710 Univ Dr, Washington, WA 99354 USA

年份：2021

卷号：69

期号：45

起止页码：13568-13577

外文期刊名：JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY

收录：;EI(收录号：20214611177409);Scopus(收录号：2-s2.0-85119071330);WOS:【SCI-EXPANDED(收录号:WOS:000727379600004)】；

基金：This work was supported by the National Natural Science Foundation of China (grant nos. 31890773 and 32071718 to X.H. Yang), the Research Funds of Jiangsu Key Laboratory for Biomass Energy and Material (grant no. JSBEM-S-201803 to X.H. Yang), Fundamental Research Funds of Research Institute of Forestry New Technology (grant no. CA-FYBB2019SZ007 to X.H. Yang), and USDA NIFA grant (grant no. 2018-67009-27902 to X. Zhang and X.J. Pan).

语种：英文

外文关键词：ether bond cleavage; lithium bromide; methoxyl; phenolic hydroxyl; radical scavenger

摘要：To improve the reactivity and enrich the functionality of lignin for valorization, kraft lignin was depolymerized and demethylated via cleaving aryl and alkyl ether bonds in acidic lithium bromide trihydrate (similar to 60% LiBr aqueous solution). It was found that the cleavage of the ether bonds followed the order of beta-O-4 ether > aryl alkyl ether in phenylcoumaran > dialkyl ether in resinol > methoxyl (MeO). The depolymerization via beta-O-4 cleavage occurred under mild conditions (e.g., <0.5 M HCl at 110 degrees C), while sufficient demethylation of the lignin needed harsher conditions (>1.5 M HCl). Both depolymerization and demethylation generated new aromatic hydroxyl (ArOH). With 2.4 M HCl, MeO content dropped from 4.85 to 0.95 mmol/g lignin, and ArOH content increased from 2.78 to 5.09 mmol/g lignin. The depolymerized and demethylated kraft lignin showed excellent antioxidant activity and Cr(VI)-scavenging capacity, compared with original kraft lignin and tannins.