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On the antioxidant activity of eumelanin biopigments: a quantitative comparison between free radical scavenging and redox properties

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journal contribution
posted on 02.01.2019 by Teresa Cecchi, Alessandro Pezzella, Eduardo Di Mauro, Samuel Cestola, David Ginsburg, Mattia Luzi, Alessandro Rigucci, Clara Santato

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 Sepia ink, eumelanin from Sepia 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.