2,2-Diphenyl-1-picrylhydrazyl (DPPH)(CAT . : ODB404) is a stable organic radical commonly used in analytical chemistry and biochemistry, especially as a reagent for measuring the free radical scavenging ability of antioxidants. With its deep purple color, DPPH is reduced and loses color upon interaction with antioxidant molecules, allowing for the quantification of antioxidant capacity in various substances. It is a crucial tool in research related to oxidative stress, natural product chemistry, and pharmaceuticals, offering a simple and efficient method to study radical behavior and antioxidant potential.