Electron Paramagnetic Resonance investigations of ultraviolet irradiated prednisone

Damian, Grigore; Andreea, Teodor; Anca, Popescu Irina; Emilia, Creanga Dorina

doi:10.1109/ehb.2017.7995529

Cited by 1 publication

(1 citation statement)

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“…The use of EPR to study the free radicals generated in cellulose after irradiation keeps finding new applications. It has been applied to study the possible application of cotton fibers as a dosimeter during accidental radiation exposure, to investigate the effects of UV light in drugs and their active substances, and to explore the antioxidant and oxidative stability of natural foods [169][170][171][172][173].…”

Section: Electron Paramagnetic Resonance (Epr)mentioning

confidence: 99%

On the Mechanism of the Ionizing Radiation-Induced Degradation and Recycling of Cellulose

List,

Gonzalez-Lopez,

Ashfaq

et al. 2023

Polymers

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The use of ionizing radiation offers a boundless range of applications for polymer scientists, from inducing crosslinking and/or degradation to grafting a wide variety of monomers onto polymeric chains. This review in particular aims to introduce the field of ionizing radiation as it relates to the degradation and recycling of cellulose and its derivatives. The review discusses the main mechanisms of the radiolytic sessions of the cellulose molecules in the presence and absence of water. During the radiolysis of cellulose, in the absence of water, the primary and secondary electrons from the electron beam, and the photoelectric, Compton effect electrons from gamma radiolysis attack the glycosidic bonds (C-O-C) on the backbone of the cellulose chains. This radiation-induced session results in the formation of alkoxyl radicals and C-centered radicals. In the presence of water, the radiolytically produced hydroxyl radicals (●OH) will abstract hydrogen atoms, leading to the formation of C-centered radicals, which undergo various reactions leading to the backbone session of the cellulose. Based on the structures of the radiolytically produced free radicals in presence and absence of water, covalent grafting of vinyl monomers on the cellulose backbone is inconceivable.

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