化学
木质素
DPPH
催化作用
抗氧化剂
激进的
有机化学
胺气处理
核化学
试剂
多酚
水溶液
作者
Zhili Zhang,Fengfeng Li,Jeongwon Heo,Jiansong Chen,Ji Woo Kim,Min Soo Kim,Yong Sik Kim
标识
DOI:10.1080/02773813.2023.2173781
摘要
The formation of phenoxy radicals that scavenge free radicals is critical for improving the antioxidant activity of lignin. Novel modified lignin with high phenolic hydroxyl content and enhanced antioxidant properties was prepared from kraft lignin using a two-step method. First, diethylenetriamine-modified amine lignin (DAL) was synthesized via the Mannich reaction. Second, the DAL was reacted with 3,4-dihydroxyhydrocinnamic acid (DHCA) using N-hydroxysuccinimide as the catalyst. The DHCA-modified DAL (DDAL) was characterized and tested for the removal of 1,1-diphenyl-2-picrylhydrazyl (DPPH) from aqueous solutions. The optimum conditions were as follows: a reaction temperature of 80 °C, a 1:1 mass ratio of DHCA to DAL, and a catalytic time of 2 h. The phenolic content of DDAL increased from 0.81 to 1.51 mmol/g. More importantly, the DPPH free radical scavenging capacity of DDAL reached 79.94% at a concentration of 0.50 mg/mL. This study provides a practical strategy for preparing high-performance bio-based antioxidants.
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