Spin-Trapping Reactions of a Novel Gauchetype Radical Trapper G-CYPMPO

Abstract

Chemical reactions of a novel gauchetype spin trap, G-CYPMPO (sc-5-(5,5-dimethyl-2-oxo-1,3,2-dioxaphosphinan-2-yl)-5-methy-1-pyrroline N-oxide, O1–P1–C6–N1 torsion angle = 52.8°), with reactive oxygen species were examined by pulse radiolysis technique with 35 MeV electron beam and by electron spin resonance spectroscopy after 60Co γ-ray irradiation. The spin-trapping reaction rate constants of G-CYPMPO toward the hydroxyl radical and the hydrated electron were estimated to be (4.2 ± 0.1) × 109 and (11.8 ± 0.2) × 109 M–1s–1, respectively. Half-lives of the spin adducts, hydroxyl radical, and perhydroxyl radical adducted G-CYPMPO were estimated to be ∼35 and ∼90 min, respectively. A comparison of the results with earlier reports using different radical sources suggests that the purity of the solution and/or the radical generation technique may influence the stability of the spin adducts.

Production of the Hydroxyl Radical and Removal of Formaldehyde by Calcined Green Tuff Powder and Tile

“…After mixing, the tube was strongly shaken for 10 seconds. In this study, a novel radical trapper, {2-(5,5-dimethyl-2-oxo-1,3,2-dioxaphosphinan-2yl)-3,4-dihydro-2-methyl-2H-pyrrole N-oxide, G-CYPMPO}, was used to trap free radicals [17]. The chemical structure of G-CYPMPO is shown in Figure 2a.…”

Removal of Banana Tree Fungi Using Green Tuff Rock Powder Waste Containing Zeolite

“…The other solution was a hypoxanthine/xanthine oxidase (HX/XO) system solution to produce the superoxide radical (mixture of 1.8 vol% of 10.97 units/mL XO and 10 vol% of 20 mM HX). In this study, a novel radical trapper, G-CYPMPO [24], was used for trapping the free radicals.…”

Estimation of Relative Reaction Rate of Hydroxy Radical with Poly-hydroxy Benzenes: ESR Spin Trapping Combined with UV-A Photolysis

“…Therefore, the apparent rate constant of the reaction of the hydroxyl radical with DMPO (k1) in this study cannot be directly compared to that obtained by pulse radiolysis. 3,14,15 Instead of the comparison with the absolute rate constant, the relative reaction rates for the hydroquinone values are compared, as listed in Table 1. The relative values obtained in this study are comparable to those of pulse radiolysis studies.…”