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By studying the protection of oxidative stress induced damage in biomolecules by several groups of antioxidants, from the “side of the antioxidant”, that is, by observing the reaction of the antioxidant itself with an oxidizing species and characterizing the resulting products, it was possible to classify the antioxidants into three different kinds. An antioxidant can act as a scavenger of the oxidizing species, repair a damaged biological molecule, or give new products with antioxidising activity, starting an antioxidising cascade. These three effects – scavenging, repair and cascade – can act in a separate or a cumulative way. This new classification of antioxidants by type of action can bring a new insight on the comprehension of the protection mechanisms and open perspectives to the design of new and more efficient antioxidants.

A Tentative Classification of Antioxidants: Which Role They Play when Protecting Biological Targets from Oxidative Stress Induced Damage?