Fig. 3From: Tannic acid-functionalized 3D porous nanofiber sponge for antibiotic-free wound healing with enhanced hemostasis, antibacterial, and antioxidant propertiesAntioxidant activity. a The absorbance of DPPH in different samples. b The color change of DPPH blend before and after exposing to 3D, 3D-TA0.5 and 3D-TA1.0 nanofiber sponges. c The SADPPH of different samplesBack to article page