Journal ArticleDOI
Re-evaluation of the thiocyanate dosimeter for pulse radiolysis
George V. Buxton,Craig R. Stuart +1 more
TLDR
In this article, the super-Fricke dosimeter was used as a secondary standard for the thiocyanate dosimeter in O2-saturated water and the results were improved to 3.47 ± 0.06.Abstract:
The thiocyanate dosimeter (10–2 mol dm–3 SCN– in O2-saturated water) has been standardised against the super-Fricke dosimeter (10–2 mol dm–3 FeII in O2-saturated 0.4 mol dm–3 H2SO4) using the hexacyanoferrate(II) dosimeter [5 × 10–3 mol dm–3 Fe(CN)64– in O2-saturated water] as a secondary standard. On the basis that G(FeIII)= 1.67 × 10–6 mol J–1 and IµFeIII= 220.4 m2 mol–1 at 304 nm and 25 °C in the super-Fricke dosimeter, we obtain GIµ[Fe(CN)63–]=(3.47 ± 0.06)× 10–5 m2 J–1 at 420 nm and GIµ(SCN)2˙–=(2.59 ± 0.05)× 10–4 m2 J–1 at 475 nm. These values remain unchanged when the solutions are saturated with air instead of O2 and are doubled in N2O-saturated solution.read more
Citations
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Arrhenius parameter determination for the reaction of the oxide radical, hydrated electron and hydroxyl radical with iodate in aqueous solution
TL;DR: In this article, the temperature dependence of the reactions of the primary water radiolysis radicals, O˙−, e−aq and ˙OH with IO3− with respect to absorption spectroscopy was determined.
Journal ArticleDOI
One-Electron Reduction of Penicillins in Relation to the Oxidative Stress Phenomenon.
TL;DR: This study aimed at investigating the one-electron reduction mechanism of selected penicillin derivatives using pulse radiolysis techniques, which produced Ketyl radicals, which are reducing agents with possibility to interact with suitable biomolecules.
Journal ArticleDOI
Cellular Membrane Protection Against Reactive Oxygen Species by Terminalia Arjuna and Its Active Component Baicalein
Jai C. Tilak,Thomas P.A. Devasagayam,Soumyakanti Adhikari,Ramachandra D. Lele,Tatsuya Kon,Osamu Handa,Yuji Naito,Toshikazu Yoshikawa +7 more
TL;DR: Terminalia arjuna is an Indian medicinal plant credited with cardiotonic and cardioprotective properties; and baicalein is the active ingredient, which is highly effective in inhibiting lipid peroxidation, reactive oxygen species generation, and plasma oxidation, even at low concentrations of 10‐25 µM.
Journal ArticleDOI
High laser efficiency and photostability of pyrromethene dyes mediated by nonpolar solvent.
TL;DR: Heptane is identified as a promising solvent for these pyrromethene dyes for use in high average power dye lasers, pumped by copper vapor lasers or diode-pumped solid-state green lasers.
Journal ArticleDOI
On the complex •OH/•O--induced free radical chemistry of arylalkylamines with special emphasis on the contribution of the alkylamine side chain.
László Szabó,Viktória Mile,Tünde Tóth,György T. Balogh,Tamás Földes,Erzsébet Takács,László Wojnárovits +6 more
TL;DR: The fundamental reactions are investigated on the model compound N-methyl-3-phenypropylamine, and extended to its biologically active analog, to the antidepressant fluoxetine (FLX).
References
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Journal ArticleDOI
Critical Review of rate constants for reactions of hydrated electrons, hydrogen atoms and hydroxyl radicals (⋅OH/⋅O− in Aqueous Solution
TL;DR: In this article, the rate constants for over 3500 reaction are tabulated, including reaction with molecules, ions and other radicals derived from inorganic and organic solutes, and the corresponding radical anions, ⋅O− and eaq−, have been critically pulse radiolysis, flash photolysis and other methods.
Journal Article
Critical review of rate condtants for reaction of hydrated electrons, hydrogen atoms and hydroxyl radicals in aqueous solution
Journal ArticleDOI
Yield for the scavenging of hydroxyl radicals in the radiolysis of nitrous oxide-saturated aqueous solutions
TL;DR: In this article, the thiocyanate dosimeter was calibrated against the Fricke system to obtain a value of 46,400 +-600 (molecules/100 eV) for the product of yield and extinction coefficient of (SCN)/sub 2/O-saturated solutions.
Journal ArticleDOI
Track effects in radiation chemistry. Concentration dependence for the scavenging of hydroxyl by ferrocyanide in nitrous oxide-saturated aqueous solutions
TL;DR: In this paper, the radiation chemical yield for oxidation of ferrocyanide by OH produced in the fast electron radiolysis of N/sub 2/O-saturated aqueous solutions was found to increase from a low concentration limiting yield of 5.2 to values in excess of 6.7.