Singlet oxygen quantum yield determination using chemical acceptors

Roger Bresolí-Obach, Joaquim Torra, Renzo P. Zanocco, Antonio L. Zanocco, Santi Nonell

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5 Cites (Scopus)

Resum

Singlet oxygen (1O2) is the first electronic excited state of molecular oxygen. Due to its non-radical and non-ionic character as well as its mild reactivity, 1O2 has a pivotal role in cell signaling processes at low concentration, yet it is cytotoxic at high concentrations. Quantifying the production of 1O2, particularly in biological systems, is therefore essential for understanding and controlling its effects. 1O2 can be produced by chemical and biological reactions, yet its most common method of production is by photosensitization, whereby an initially photoexcited molecule transfers its acquired electronic energy to the dioxygen molecule. The efficiency of this process is characterized by the 1O2 production quantum yield, ΦΔ, which can be determined by directly monitoring its intrinsic weak near-infrared phosphorescence or indirectly by trapping it with a suitable acceptor, a process that can be monitored by common analytical techniques. Indirect methods are thus very popular, yet they may lead to severe errors if used incorrectly. Herein we describe the common aspects of indirect methods and propose a general step-by-step procedure for the determination of ΦΔ values. In addition, we identify the key experimental conditions that need to be controlled to obtain meaningful results.

Idioma originalAnglès
Títol de la publicacióMethods in Molecular Biology
EditorHumana Press Inc.
Pàgines165-188
Nombre de pàgines24
DOIs
Estat de la publicacióPublicada - 2021

Sèrie de publicacions

NomMethods in Molecular Biology
Volum2202
ISSN (imprès)1064-3745
ISSN (electrònic)1940-6029

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