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- W2314543889 abstract "Abstract The photochemical properties of 4'-N-acetyl derivative of norfloxacin (ANFX) were investigated in different solutions. Both UV-Vis absorption and the quantum yields of excited states are pH-dependent, and p K a value of ground state for the protonation of 3-carboxylic group was determined to be 6.5 ± 0.2. Pulse radiolysis and laser flash photolysis experiments were carried out to characterize transient species of ANFX and to investigate reactions with tryptophan (TrpH) and 2'-seoxyguanosine-5'-monophosphoric acid disodium salt (dGMP). The ANFX undergoes the photoejection of electron by a mixed mechanism of one-photon and two-photon processes. Under moderate laser energy conditions, two-photon process is predominantly. The ANFX radical dianion (ANFX(–H) ·2− ) formed in reaction with e aq − is characterized by the absorption around 370 nm, and the rate constant was determined to be 1.2 × 10 10 dm 3 mol −1 s −1 . The 3 ANFX(–H) −∗ is able to oxidize TrpH and dGMP with bimolecular rate constants of 5.4 × 10 8 and 9.5 × 10 6 dm 3 mol −1 s −1 , respectively. The ANFX(–H) ·2− and the oxidized radicals of TrpH and dGMP were observed directly. Under aerobic conditions, the photo-oxidations involve both type I and type II mechanisms." @default.
- W2314543889 created "2016-06-24" @default.
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- W2314543889 date "2011-05-03" @default.
- W2314543889 modified "2023-09-23" @default.
- W2314543889 title "Photochemical Properties and Reactions with Biomolecules of 4'-N-Acetyl Derivative of Norfloxacin" @default.
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- W2314543889 doi "https://doi.org/10.1524/zpch.2011.0100" @default.
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