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The inhibition of QU-Nanogel on ROS generation. The determination of ROS level was measured by DCFH staining at different time points (a) 6 h and (b) 12 h. The green fluorescence intensity of DCF represents the ROS level in A549 cells. Quercetin and QU-Nanogel both decreased the ROS level meanwhile QU-Nanogel showed stronger free radical scavenging capacity than quercetin
