On the antioxidant activity of eumelanin biopigments: a quantitative comparison between free radical scavenging and redox properties CecchiTeresa PezzellaAlessandro MauroEduardo Di CestolaSamuel GinsburgDavid LuziMattia RigucciAlessandro SantatoClara 2019 <p>The antioxidant activity of eumelanin, a ubiquitous pigment in flora and fauna, constitutes one of its most fascinating physicochemical properties. To shed light on free radical scavenging vs redox facets of such activity, we applied hydrogen atom transfer- and electron transfer-based assays to pristine <i>Sepia</i> ink, eumelanin from <i>Sepia</i> ink, chemically controlled eumelanins and their precursor building blocks. Our work contributes to the rational use of the antioxidant properties of eumelanin for health, cosmetics and environmental applications.</p>