4.6. Radical Scavenging Activity
The most widely used methods for measuring antioxidant capacity involve the generation of radical species, the presence of antioxidants determining the disappearance of these radicals. DPPH (2,2-diphenyl-1-picrylhydrazyl) radical assay examines the availability of a substance to reduce the DPPH˙ radical. As DPPH˙ is one of the few stable and commercially available organic nitrogen radicals, it is preferred over other methods in which the radical has to be formed [