Laser flash photolysis of aqueous acetaminophen solutions |
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| Authors: | A. V. Litke I. P. Pozdnyakov V. F. Plyusnin V. P. Grivin N. M. Bazhin Zhang Xue Feng Wu Nansheng Deng |
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| Affiliation: | (1) Institute of Chemical Kinetics and Combustion, Siberian Branch, Russian Academy of Sciences, ul. Institutskaya 3, Novosibirsk, 630090, Russia;(2) Novosibirsk State University, ul. Pirogova 2, Novosibirsk, 630090, Russia;(3) Department of Environmental Science, Wuhan University, Wuhan, Hubei, 430072, P. R. China |
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| Abstract: | The N-acetyl-4-aminophenoxyl radical, a supposed intermediate of the enzymatic oxidation of acetaminophen in living organisms, was prepared and studied by means of nanosecond laser flash photolysis. A number of important spectral-kinetic parameters of this species were determined, namely, the absorption coefficient at 440 nm ((4.2±0.2)×103 l mol?1cm?1), the quantum yield of acetaminophen photoionization at 266 nm (φ= 0.03), and the rate constants for recombination (2k= (2.4±0.3))×109 l mol?1s?1) and the reaction with the superoxide radical (k= (9±2))×109 l mol?1s?1). |
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