However, such an oxidation could result from either the direct reaction of 1 O 2 within cellular DNA (SchemeFS1) or the oxidative stress induced by the intracellular production of singlet oxygen. Reactivity and biomolecule damage by these ROS depend on the surrounding conditions and targeting molecules. naples, inst. Nearly all documented singlet oxygen reactions are defined pericyclic reactions without radical chain oxidation contribution. Therefore, a chemical generator of labeled singlet oxygen DHPN 18 O 2 ( 30 ) was used to distinguish between the two possible mechanisms. Many photosensitised processes require molecular oxygen in the initial step, e.g., dye-photosensitised oxidation of cholesterol and photodynamic therapy (PDT). The partial oxidation of benzene on vanadium and molybdenum oxides and the participation of singlet oxygen in this reaction were studied. Oxidation processes of chemical materials by molecular oxygen are important H2O2 source, whereas photochemical reaction is important for 1O2 production. J. Colloid Interface Sci. The reaction of singlet oxygen with phenol results in the formation of hydroperoxides that dehydrate to form p-benzoquinones [8b]. The oxidation of organic sulfides, disulfides, and amines has also been intensely studied [13]. singlet oxygen increased with increasing pH and the oxidation rate dramatically was elevated at around pH 5.4 and 9.8, which are the acidity constants of uric acid, pKa1 and pKa2, respectively. Merging singlet-oxygen induced furan oxidations with organocatalysis: synthesis of enantiopure cyclopentanones and hydrindanes† Dimitris Kalaitzakis , a Manolis Sofiadis , a Vasileios Tsopanakis , a Tamsyn Montagnon a and Georgios Vassilikogiannakis * a This work provides an alternative approach to obtain singlet oxygen, which may guide further design of photocatalysts with high efficiency and selectivity towards photocatalytic organic synthesis. chem./naples/ita source j. heterocycl. Cyanide oxidation by singlet oxygen generated via reaction between H2O2 from cathodic reduction and OCl(-) from anodic oxidation. In this study, we have shown that singlet oxygen-mediated oxidation during UVA treatment alters the dynamic of genomic DNA replication. Oxidation of di-tert-butylthioketene (1) and 1,1,3,3-tetramethyl-2-(thiocarbonyl)cyclohexane (2) by singlet oxygen has been investigated and has been found to exhibit a unique behavior different from that of ketenes and ketenimines. Both singlet oxygen generated in a radio‐frequency gasdischarge, and photosensitization by natural pigments, were shown to catalyze the oxidation of methyl linoleate. This result indicates that oleic acid is readily degraded despite its lower unsaturated degree. This analysis concerns the role of free radicals and singlet oxygen in the photooxydation of fatty acids and the consequences of that process in biological systems. Les espèces réactives de l'oxygène sont générées dans l'environnement biologique dans le cadre du métabolisme, mais elles peuvent aussi être produites en excès dans le cas de stress oxydatif provoqué par exemple par une exposition aux rayons UV. In the present work we are interested in the oxidation of proteins by two of those reactive species of oxygen : hydrogen peroxide, rather weak oxidant with a long life time, and singlet oxygen, a strong oxidant with a short life time. Furthermore, we observed that the absorbance near 200 nm and the molar extinction coefficient (ε) increased with increasing pH, similar to the change in oxidation rate. photosensitized oxidation of furans. Oxidation of virus proteins during UV(254) and singlet oxygen mediated inactivation Environ Sci Technol. Singlet oxygen is produced by light absorption by photosensitizers and, in plants, particularly by the chlorophylls and their precursors. They used a new singlet oxygen generating system which led to insufficient peroxide formation to account for the extensive killing of E. Coli that they observed (95%). Photo-oxidation of ergosterol as an indirect method for singlet oxygen detection. ; issn 0022-152x; usa; da. Phenolic substances are important components of the human diet, and one of such compounds is the amino acid tyrosine. Universidad de Buenos Aires, Ciudad Universidaria, 1428 Buenos Aires, Argentina 8 ref. Quim. Nat. Similarly to other active O2 species, 1O2 has a dual effect: It is toxic, causing oxidation of biomolecules, and it can act as a signal molecule that leads to cell death or to acclimation. Nonconjugated hydroperoxides could not be detected … In the field of photosensitization, the basic mechanisms are classified in two groups : type I (without the participation of 02) and type II (with participation of 02) mechanisms. The U.S. Department of Energy's Office of Scientific and Technical Information The involvement of singlet oxygen was shown by the identification of nonconjugated hydroperoxides as products common to both photooxidation and singlet O 2 oxidation. The rate constant for the reaction between furfuryl alcohol (FFA) and singlet oxygen (1 O 2) in aqueous solution was measured as a function of temperature, pH and salt content employing both steady-state photolysis (β value determination) and time-resolved singlet oxygen phosphorescence methods.The latter provided more precise and reproducible data.
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