Azocompounds as generators of defined radical species: Contributions and challenges for free radical research

Lopez-Alarcon, Camilo; Fuentes-Lemus, Eduardo; Figueroa, Juan David; Dorta, Eva; Schoeneich, Christian; Davies, Michael J.

Abstract

Peroxyl radicals participate in multiple processes involved in critical changes to cells, tissues, pharmacueticals and foods. Some of these reactions explain their association with degenerative pathologies, including cardiovascular and neurological diseases, as well as cancer development. Azocompounds, and particularly AAPH (2,2 ' Azobis(2-methylpropionamidine) dihydrochloride), a cationic water-soluble derivative, have been employed extensively as sources of model peroxyl radicals. A considerable number of studies have reported mechanistic data on the oxidation of biologically-relevant targets, the scavenging activity of foods and natural products, and the reactions with, and responses of, cultured cells. However, despite the (supposed) experimental simplicity of using azocompounds, the chemistry of peroxyl radical production and subsequent reactions is complicated, and not always considered in sufficient depth when analyzing experimental data. The present work discusses the chemical aspects of azocompounds as generators of peroxyl (and other) radicals, together with their contribution to our understanding of biochemistry, pharmaceutical and food chemistry research. The evidence supporting a role for the formation of alkoxyl (RO center dot) and other radicals during thermal and photochemical decomposition of azocompounds is assessed, together with the potential influence of such species on the reactions under study.

Más información

Título según WOS: Azocompounds as generators of defined radical species: Contributions and challenges for free radical research
Título de la Revista: FREE RADICAL BIOLOGY AND MEDICINE
Volumen: 160
Editorial: Elsevier Science Inc.
Fecha de publicación: 2020
Página de inicio: 78
Página final: 91
DOI:

10.1016/j.freeradbiomed.2020.06.021

Notas: ISI