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Synergistic Antioxidant Performance of Lignin and Quercetin Mixtures
journal contribution
posted on 2017-08-02, 00:00 authored by Di Liu, Ying Li, Yong Qian, Yang Xiao, Shengjun Du, Xueqing QiuA natural, effective, and inexpensive
hindered phenolic antioxidant
mixture was prepared by blending lignin into quercetin. The antioxidant
performance of lignin and quercetin mixture was analyzed by determining
the 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging capacity
and a low-cost and high-efficiency ratio was found to be 4:1 (w/w).
After UV radiation for 4 h, the DPPH scavenging ratio of the quercetin/lignin
mixture decreased only 13.8%, while that of quercetin and lignin decreased
42.9% and 28.6%, respectively. The UV and fluorescence analysis indicated
that quercetin molecules inserted into the lignin to weaken its aggregation
and form new conjugated structures. Adding lignin may provide a green
alternative to the expensive quercetin or synthetic antioxidants used
in food, cosmetics, and pharmaceuticals.