Introducing common oxazine fluorophores as new redox labels for electrochemical DNA sensors.

The electrochemical properties of three oxazine fluorophores, ATTO655, ATTO680 and ATTO700 have been investigated at gold electrodes. They display a reversible or quasi-reversible voltammetric behaviour involving either a 2e, 2H or a 2e, 1H redox process depending on the pH, at a formal potential located in the stability range of thiolate self-assembled monolayers (E°' ≈ -0.33 V vs.