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• W2079221436 endingPage "14204" @default.
• W2079221436 startingPage "14200" @default.
• W2079221436 abstract "Photoirradiation of TiO(2) nanoparticles by visible light in the presence of the water-soluble natural polysaccharide arabinogalactan complexes of the hydrocarbon carotenoid β-carotene leads to enhanced yield of the reactive hydroxyl (OH) radicals. The electron paramagnetic resonance (EPR) spin-trapping technique using α-phenyl-N-tert-butyl nitrone (PBN) as the spin-trap has been applied to detect this intermediate by trapping the methyl and methoxy radicals generated upon reaction of the hydroxyl radical with dimethylsulfoxide (DMSO). The free radicals formed in this system proceed via oxygen reduction and not via the reaction of holes on the TiO(2) surface. As compared with pure carotenoids, carotenoid-arabinogalactan complexes exhibit an enhanced quantum yield of free radicals and stability toward photodegradation. The observed enhancement of the photocatalytic efficiency for carotenoid complexes, as measured by the quantum yield of the desired spin adducts, arises specifically from the decrease in the rate constant for the back electron transfer to the carotenoid radical cation. These results are important for a variety of TiO(2) applications, namely, in photodynamic therapy, and in the design of artificial light-harvesting, photoredox, and catalytic devices." @default.
• W2079221436 created "2016-06-24" @default.
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• W2079221436 date "2009-12-07" @default.
• W2079221436 modified "2023-09-27" @default.
• W2079221436 title "Enhancement of the Photocatalytic Activity of TiO₂ Nanoparticles by Water-Soluble Complexes of Carotenoids" @default.
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• W2079221436 doi "https://doi.org/10.1021/jp908578j" @default.
• W2079221436 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/19968316" @default.
• W2079221436 hasPublicationYear "2009" @default.
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