文献类型：期刊文献

英文题名：Unraveling the Structure-Antioxidant Property Relationship of Lignin: Insights from Botanical Sources and pH-Controlled Fractionation

作者：Li, Kongyan[1,2];Liu, Yirun[1];Xu, Huaiyu[1];Zhong, Wei[1,2];Jin, Yongcan[1,2];Liu, Min[3];Wu, Wenjuan[1,2]

机构：[1]Nanjing Forestry Univ, Jiangsu Coinnovat Ctr Efficient Proc & Utilizat Fo, Nanjing 210037, Peoples R China;[2]Nanjing Forestry Univ, Coll Light Ind & Food Engn, Nanjing 210037, Peoples R China;[3]East China Univ Sci & Technol, Sch Mat Sci & Engn, Key Lab Specially Funct Polymer Mat & Related Tech, Minist Educ, Shanghai 200237, Peoples R China

年份：2025

卷号：26

期号：8

起止页码：5353

外文期刊名：BIOMACROMOLECULES

收录：;EI(收录号：20252918800217);WOS:【SCI-EXPANDED(收录号:WOS:001527245400001)】；

基金：The authors are grateful for the support of the National Natural Science Foundation of China (32271797, 32271811).

语种：英文

外文关键词：Biomass - Fractionation - Hardwoods - Lignin

摘要：This study employs biomass source selection (hardwood, gramineae, softwood) and pH-controlled fractionation (pH 1, 7, 9) to analyze lignin structure and optimize antioxidant capacity. Acid-precipitated hardwood lignin exhibits higher antioxidant capacity (IC50 = 0.74 mg/mL, TEAC = 1.88 mu mol/mg), attributed to higher Ph-OH (3.35 mmol/g, TPC = 0.31 GAE/g) and the possible synergistic effect of the S/G ratio (1.63). In the stepwise pH fractionation of aspen black liquor, the fraction at pH 1 (A1) exhibited the best antioxidant activity (IC50 = 0.64 mg/mL, TEAC = 2.01 mu mol/mg) and the highest Ph-OH (3.68 mmol/g, TPC = 0.37 GAE/g), while fraction A9 exhibited the weakest antioxidant activity (Ph-OH = 2.49 mmol/g, TPC = 0.3 GAE/g). Ph-OH showed the strongest correlation with IC50 (|r| = 0.94), followed by M-w (|r| = 0.89) (Ph-OH > M-w > -COOH > Alk-OH). Adjusting M-w can complement the enhancement of Ph-OH, thereby optimizing the antioxidant function.