文献类型：期刊文献

英文题名：The Enhancement Origin of Antioxidant Property of Carboxylated Lignin Isolated from Herbaceous Biomass Using the Maleic Acid Hydrotropic Fractionation

作者：Su, Chen[1,2] Wang, Xiu[3] Deng, Yongjun[2] Min, Douyong[1] Fang, Guigan[2] Huang, Chen[1,2]

第一作者：Su, Chen

通信作者：Huang, C[1];Huang, C[2];Wang, X[3]

机构：[1]Guangxi Univ, Coll Light Ind & Food Engn, Guangxi Key Lab Clean Pulp & Papermaking & Pollut, Nanning 530004, Peoples R China;[2]Chinese Acad Forestry, Inst Chem Ind & Forest Prod, Jiangsu Coinnovat Ctr Efficient Proc & Utilizat Fo, Nanjing 210042, Peoples R China;[3]Peking Univ, Sch Mat Sci & Engn, Key Lab Polymer Chem & Phys, Minist Educ, Beijing 100871, Peoples R China

年份：2024

卷号：25

期号：17

外文期刊名：INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES

收录：;Scopus(收录号：2-s2.0-85203633194);WOS:【SCI-EXPANDED(收录号:WOS:001311271400001)】；

基金：This research was funded by Guangxi Key Laboratory of Clean Pulp & Papermaking and Pollution Control, College of Light Industry and Food Engineering, Guangxi University (No. 2023GXZZKF63), the National Natural Science Foundation of China (No. 22308373), the Key Lab. of Biomass Energy and Material, Jiangsu Province (JSBEM-S-202316), and the Taishan Industry Experts Program (tscy20200213). And The APC was funded by the National Natural Science Foundation of China (No. 22308373).

语种：英文

外文关键词：lignin; antioxidant property; maleic acid; carboxyl groups; structure-activity relationship

摘要：Lignin is endowed with antioxidant activity due to its diverse chemical structure. It is necessary to explore the relationship between antioxidant activity and the chemical structure of the lignin to develop its high-value utilization. Herein, we employed maleic acid (MA) as a hydrotropic agent to preferably isolate the lignin from distinct herbaceous sources (wheat straw and switchgrass) under atmospheric pressure conditions. The resultant acid hydrotropic lignin (AHL) isolated from wheat straw exhibited high radical scavenging rates, up to 98% toward DPPH and 94% toward ABTS. Further investigations indicated that during the MA hydrotropic fractionation (MAHF) process, lignin was carboxylated by MA at gamma-OH of the side-chain, providing additional antioxidant activity from the carboxy group. It was also found that the radical scavenging rate of AHL has a positive correlation with carboxyl, phenolic hydroxyl contents, and the S-G (syringyl-guaiacyl) ratio, which could be realized by increasing the MAHF severity. Overall, this work underlies the enhancement origin of the antioxidant property of lignin, which will facilitate its application in biological fields as an efficient, cheap, and renewable antioxidant additive.