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Production of Reactive Oxygen Species on Photolysis of Dilute Aqueous Quinone Solutions
Author(s) -
Garg Shikha,
Rose Andrew L.,
Waite T. David
Publication year - 2007
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.2007.00075.x
Subject(s) - chemistry , hydrogen peroxide , photochemistry , superoxide , reactive oxygen species , aqueous solution , radical , quinone , dimethyl sulfoxide , photodissociation , oxygen , anthraquinone , singlet oxygen , hydroxyl radical , solvent , inorganic chemistry , organic chemistry , biochemistry , enzyme
We have examined the generation of the reactive oxygen species (ROS) superoxide and hydrogen peroxide (H 2 O 2 ) by irradiation of dilute aqueous solutions of disodium anthraquinone‐2‐6‐disulfonate (AQDS) with simulated sunlight. Irradiating a solution of AQDS in 2 m M NaHCO 3 and 0.01 M NaCl produced superoxide and H 2 O 2 at nanomolar concentrations. Experiments in which initial concentrations of dioxygen, H 2 O 2 , the superoxide radical trap nitroblue tetrazolium and the electron donor dimethyl sulfoxide were varied suggested that the interaction of solvent water with photo‐excited quinone moieties produces dioxygen‐reducing radicals, and that these are the primary source of ROS in the system. A kinetic model for ROS production is proposed based on our experimental data.