2,2-Diphenyl-1-picrylhydrazyl (E2925-GRP)

2,2-Diphenyl-1-picrylhydrazyl (DPPH) is a stable free radical that can be used to measure the radical scavenging activity of antioxidants. The odd electron of nitrogen atom in DPPH is reduced by receiving a hydrogen atom from antioxidants to the corresponding hydrazine.