10.1021/acssuschemeng.7b02282.s001 Di Liu Di Liu Ying Li Ying Li Yong Qian Yong Qian Yang Xiao Yang Xiao Shengjun Du Shengjun Du Xueqing Qiu Xueqing Qiu Synergistic Antioxidant Performance of Lignin and Quercetin Mixtures American Chemical Society 2017 DPPH Synergistic Antioxidant Performance antioxidant performance Quercetin Mixtures high-efficiency ratio lignin quercetin mixture 4 h phenolic antioxidant mixture fluorescence analysis UV radiation quercetin molecules 2017-08-02 00:00:00 Journal contribution https://acs.figshare.com/articles/journal_contribution/Synergistic_Antioxidant_Performance_of_Lignin_and_Quercetin_Mixtures/5303152 A 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.