D. Harmatz, G. Blauer
Sep 1, 1983
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Journal
Photochemistry and Photobiology
Abstract
Abstract— Some reactions of methylene blue (oxidized form) excited by visible light, were investigated at 25°C in dilute and deaerated aqueous solutions. Under these conditions, methylene blue causes oxidation of sodium ascorbate, ferrocytochrome c and ethylenediamine tetraacetate (in air), as determined spectrophotometrically. Most of these reactions showed measurable reversibility in the dark. Chelation with divalent ions inhibited the photoxidation of ethylenediamine tetraacetate. Ferricytochrome c was reduced by excited methylene blue. The buffers used in the above reactions (Tris‐HCl or sodium phosphate) appeared to participate in these photoexcited systems. Inhibitors are described for the methylene blue‐ascorbate photoreaction.