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Type 2 photoreactions are singlet oxygen (1O2) mediated. This singlet oxygen will de activate by reacting with a number
of targets and produce ROS and peroxides that will in turn give Reactive Oxygen Species (ROS). In order to verify
whether sera had the same capability to do so we provoked a photoreaction using Rose Bengal (RB) added to sera of 53
healthy donors and at the end of light delivery 2' -7' dichlorofluorescin (DCFH) had been added. In order to avoid any
optical artefact we analysed the influence of haemolysis on the fluorescent 2' -7' dichlorofluorescin (DCF) induced by
oxidising species. Reactivity to singlet oxygen was slightly different between men and women, varied slightly with age
and platelet number. It was remarkably stable over a large period of time and thus represents a characteristic of each
serum. Studies are in progress to verify whether ROS dependent diseases would impair this reactivity to singlet oxygen.
David Olivier,Samuel Douillard,Isabelle Lhommeau,Edith Bigot, andThierry Patrice
"Photoreactions for total antioxidant status measurement in humans", Proc. SPIE 7380, Photodynamic Therapy: Back to the Future, 73800O (13 July 2009); https://doi.org/10.1117/12.823472
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David Olivier, Samuel Douillard, Isabelle Lhommeau, Edith Bigot, Thierry Patrice, "Photoreactions for total antioxidant status measurement in humans," Proc. SPIE 7380, Photodynamic Therapy: Back to the Future, 73800O (13 July 2009); https://doi.org/10.1117/12.823472