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- W2012092131 abstract "Buckminsterfullerene (C60) is a known photosensitizer that produces reactive oxygen species (ROS) in the presence of light; however, its properties in aqueous environments are still not well understood or modeled. In this study, production of both singlet oxygen and superoxide by UV photosensitization of colloidal aggregates of C60 in water was measured by two distinct methods: electron paramagnetic resonance (EPR) with a spin trapping compound, and spectrophotometric detection of the reduced form of the tetrazolium compound XTT. Both singlet oxygen and superoxide were generated by fullerol suspensions while neither was detected in the aqu/nC60 suspensions. A mechanistic framework for photosensitization that takes into account differences in C60 aggregate structure in water is proposed to explain these results. While theory developed for single molecules suggests that alterations to the C60 cage should reduce the quantum yield for the triplet state and associated ROS production, the failure to detect ROS production by aqu/nC60 is explained in part by a more dense aggregate structure compared with the hydroxylated C60." @default.
- W2012092131 created "2016-06-24" @default.
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- W2012092131 date "2008-04-29" @default.
- W2012092131 modified "2023-10-07" @default.
- W2012092131 title "Mechanisms of Photochemistry and Reactive Oxygen Production by Fullerene Suspensions in Water" @default.
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- W2012092131 doi "https://doi.org/10.1021/es702172w" @default.
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