Temperature dependence of hydroxyl radical reactions with chloramine species in aqueous solution

Temperature Dependence of the Complexation Mechanism of Celecoxib and Hydroxyl-β-cyclodextrin in Aqueous Solution

Hydroxypropyl-β-cyclodextrin (HP-β-CD) is commonly used as a complexation reagent to solubilize compounds with poor aqueous solubility to improve in vivo dosing. However, the degree of solubility enhancement was often limited by the formation of only a 1:1 complex and a low complexation constant (K). Such a limitation can be significantly improved by the formation of 1:2 complexes in some cases...

Investigation of hydroxyl radical recycling reactions in aldehydes

Reactivity of aliphatic peptides toward hydroxyl radicals in aqueous solution.

増 田高廣,吉 原清隆,篠 原広行,近 藤正春:東 京都立大学理学部化学教室,東 京都世 田谷 区深 沢2-1-1〒158 Rate constants for the hydrogen abstraction reactions of hydroxyl radicals from aliphatic peptides and N-acetyl amino acids were determined by the p-nitrosodimethylaniline method in gamma-irradiated solutions. For peptides, enhancement of reactivity toward hydroxyl radicals was expected, because of disappearance of suppression by NH3...

Reaction of Dihydroxymethyl Radical with Molecular Oxygen in Aqueous Solution

Dihydroxymethyl radical (1) was found to react with oxygen diffusion controlled (k = 4.5 x 109 M _ 1 s 1 ) . The final products of the reaction are formic acid and 1/2 hydrogen peroxide. The precursor of H2O2 was shown to be O2' which is formed with G(02" -) = 6.3 (a value which includes the 02"~ formed by H atoms and oxygen (G(H) = 0.55)). If it is assumed that dihydroxymethylperoxyl radicals ...

The Reactions of Hydroxyl Radicals with 1,4- and 1,3-Cyclohexadiene in Aqueous Solution A Pulse Radiolysis and Product Study

The reactions of radiolytically generated hydroxyl radicals and H atoms with 1,4and 1,3-cyclohexadiene were studied by pulse radiolysis and product analysis. Hydrogen abstraction from these substrates by the O H radical yields the cyclohexadienyl radical (f (310 nm) = 4400 dm mol" cm" ' from the reaction of the H atom with benzene) with an efficiency of 50% (0.29 ,«moI / " ' ) in the case of 1,...