19910-09-9Relevant articles and documents
Efficient Assay for the Detection of Hydrogen Peroxide by Estimating Enzyme Promiscuous Activity in the Perhydrolysis Reaction
Wilk, Monika,Ostaszewski, Ryszard
, p. 1464 - 1469 (2021/02/01)
Hydrogen peroxide is an ideal oxidant in view of its availability, atom economy, or green aspects. Furthermore, it is produced by the cell mitochondria and plays a meaningful role in controlling physiological processes, but its unregulated production leads to the destruction of organs. Due to its diverse roles, a fast and selective method for hydrogen peroxide detection is the major limitation to preventing the negative effects caused by its excess. Therefore, we aimed to develop an efficient assay for the detection of H2O2. For this purpose, we combined the enzymatic method for the detection of hydrogen peroxide with the estimation of the promiscuity of various enzymes. We estimated the activity of an enzyme in the reaction of p-nitrophenyl esters with hydrogen peroxide resulting in the formation of peracid. To our knowledge, there is no example of a simple, multi-sensor demonstrating the promiscuous activity of an enzyme and detecting hydrogen peroxide in aqueous media.
Reactions of Mn(II) and Mn(III) with alkyl, peroxyalkyl, and peroxyacyl radicals in water and acetic acid
Jee, Joo-Eun,Bakac, Andreja
, p. 2136 - 2141 (2010/07/05)
The kinetics of oxidation of Mn(II) with acylperoxyl and alkylperoxyl radicals were determined by laser flash photolysis utilizing a macrocyclic nickel complex as a kinetic probe. Radicals were generated photochemically from the appropriate ketones in the presence of molecular oxygen. In both acidic aqueous solutions and in 95% acetic acid, Mn(II) reacts with acylperoxyl radicals with k = (0.5-1.6) × 106 M-1 s-1 and somewhat more slowly with alkylperoxyl radicals, k = (0.5-5) x 10 5 M-1 s-1. Mn(III) rapidly oxidizes benzyl radicals, k = 2.3 × 108 M-1 s-1 (glacial acetic acid) and 3.7 × 108 M-1 s-1 (95% acetic acid). The value in 3.0 M aqueous perchloric acid is much smaller, 1× 107 M-1 s-1. The decarbonylation of benzoyl radicals in H2O has k = 1.2 × 106 s -1.
Interpretation of the Reactivity of Benzyl Free Radical towards Peroxyacids in Terms of Orbital Interactions. Competition between Energy Gap Control and Overlap Control
Fossey, Jacques,Lefort, Daniel,Massoudi, Massoud,Nedelec, Jean-Yves,Sorba, Jeanine
, p. 781 - 786 (2007/10/02)
The factors which control the reactivity of alkyl free radicals R. in reaction (i) are studied.The reactivity of R. in (i) depends on the key orbital interaction between the SOMO of the radical and the LUMO of the peroxyacid.This interaction involves two contributions: (i) the energy gap SOMO-LUMO and (ii) the overlap SOMO-LUMO.In reaction (i) the main factor is overlap control which depends on spin delocalisation in the radical R..This proves that reaction (i) does not involve electron transfer.The energy gap control, which depends on the nucleophilic character of R., is only observed when the first factor is constant along a series of R..