ORAC – Oxygen Radical Absorption Capacity15th June 2018PureNakedVegan Ranks ability for antioxidants food to absorb free radicals High-ORAC Foods May Slow Aging Oxygen-radical absorbance capacity assay for antioxidants. Development and validation of an improved oxygen radical absorbance capacity assay using fluorescein as the fluorescent probe. The chemistry behind antioxidant capacity assays. Antioxidant capacity of vegetables, spices and dressings relevant to nutrition. Mechanisms of action of antioxidants as exemplified in vegetables, tomatoes and tea.